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From hindered to promoted settling in dispersions of attractive colloids: Simulation, modeling, and application to macromolecular characterization (2018)

Andrew M. Fiore, Gang Wang, and James W. Swan

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-06-16

Description: Author(s): Andrew M. Fiore, Gang Wang, and James W. Swan Immersed boundary simulations are used to study settling in dispersions of sticky colloids and to develop an empirical model for the settling rate that is in good agreement with experiments. The model is applied to characterize attractive interactions in concentrated macromolecular solutions. [Phys. Rev. Fluids 3, 063302] Published Fri Jun 15, 2018

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

Topics: Physics

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Orientation dynamics of dilute functionalized graphene suspensions in oscillatory flow (2018)

Giovanniantonio Natale, Naveen K. Reddy, Robert K. Prud'homme, and Jan Vermant

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-06-21

Description: Author(s): Giovanniantonio Natale, Naveen K. Reddy, Robert K. Prud'homme, and Jan Vermant Orientation dynamics of graphene suspensions is investigated in oscillatory shear flow via flow dichroism. To evaluate whether graphene sheets behave as flexible or rigid sheets during flow, the experimental data are compared with predictions from a single particle Smoluchowski equation for spheroids. [Phys. Rev. Fluids 3, 063303] Published Wed Jun 20, 2018

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

Topics: Physics

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Two-sphere swimmers in viscoelastic fluids (2018)

Charu Datt, Babak Nasouri, and Gwynn J. Elfring

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-12-06

Description: Author(s): Charu Datt, Babak Nasouri, and Gwynn J. Elfring Swimmers comprised of two rigid spheres that oscillate periodically along their axis of symmetry are examined. In viscoelastic fluids, the swimmers propel in the direction of the smaller sphere when the two spheres are of different sizes. [Phys. Rev. Fluids 3, 123301] Published Wed Dec 05, 2018

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Rivulet flow of generalized Newtonian fluids (2018)

F. H. H. Al Mukahal, B. R. Duffy, and S. K. Wilson

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-08-07

Description: Author(s): F. H. H. Al Mukahal, B. R. Duffy, and S. K. Wilson The general parametric solution for the steady unidirectional flow of a thin rivulet of a generalized Newtonian fluid is obtained and illustrated for Carreau and Ellis fluids. In particular, the solution is used to describe the behavior of a rivulet of a strongly shear-thinning Ellis fluid. [Phys. Rev. Fluids 3, 083302] Published Mon Aug 06, 2018

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Inertioelastic Poiseuille flow over a wavy surface (2018)

Simon J. Haward, Jacob Page, Tamer A. Zaki, and Amy Q. Shen

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-09-22

Description: Author(s): Simon J. Haward, Jacob Page, Tamer A. Zaki, and Amy Q. Shen Experimental evidence is presented for the existence of critical layers in inertioelastic shear flows over wavy surfaces, where theory predicts amplification of the spanwise vorticity. [Phys. Rev. Fluids 3, 091302(R)] Published Fri Sep 21, 2018

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Direct numerical simulation of particle sedimentation in a Bingham fluid (2018)

A. R. Koblitz, S. Lovett, and N. Nikiforakis

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-09-25

Description: Author(s): A. R. Koblitz, S. Lovett, and N. Nikiforakis Two-dimensional numerical simulations of a suspension of sedimenting particles in a Bingham fluid find three possible regimes: all, a fraction, and none of the particles sedimenting. [Phys. Rev. Fluids 3, 093302] Published Mon Sep 24, 2018

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Drag enhancement and drag reduction in viscoelastic flow (2018)

Atul Varshney and Victor Steinberg

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-10-16

Description: Author(s): Atul Varshney and Victor Steinberg The effect of inertia on the stability of viscoelastic flow is investigated. Three regions in the stability diagram are identified based on fluid elasticity, and a regime of flow relaminarization is discovered for high elasticity at Re up to 10, different from known turbulent drag reduction. [Phys. Rev. Fluids 3, 103302] Published Mon Oct 15, 2018

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Mixing layer instability and vorticity amplification in a creeping viscoelastic flow (2018)

Atul Varshney and Victor Steinberg

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-10-17

Description: Author(s): Atul Varshney and Victor Steinberg In channel flow hindered by two widely spaced obstacles, an elastic instability of the mixing layer arises near an inflection point on nonuniform shear velocity profiles, resulting in intermittent small vortices. In elastic turbulence a growth in the averaged vorticity above the transition is found. [Phys. Rev. Fluids 3, 103303] Published Tue Oct 16, 2018

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Flow of wormlike micellar fluids around a sharp bend: Effects of branching and shear-banding (2018)

Yiran Zhang, Hadi Mohammadigoushki, Margaret Y. Hwang, and Susan J. Muller

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-09-05

Description: Author(s): Yiran Zhang, Hadi Mohammadigoushki, Margaret Y. Hwang, and Susan J. Muller Flow transitions in wormlike micelle solutions flowing around a microfluidic 90° bend are studied. Shear-banding properties of the solution correlate with the form of secondary flow, while the micelle morphology (linear vs branched) has little effect on the flow behavior. [Phys. Rev. Fluids 3, 093301] Published Tue Sep 04, 2018

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Stokes' second problem and reduction of inertia in active fluids (2018)

Jonasz Słomka, Alex Townsend, and Jörn Dunkel

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-10-23

Description: Author(s): Jonasz Słomka, Alex Townsend, and Jörn Dunkel Simulations predict that a pendulum immersed in an active fluid oscillates faster than in a passive fluid due to a reduction of the fluid inertia. The decrease in inertia is mediated by topological defects in the stress field, which can effectively decouple the bulk flow dynamics from the pendulum. [Phys. Rev. Fluids 3, 103304] Published Mon Oct 22, 2018

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Characterization of superimposed instabilities in the planar extensional flow of viscoelastic fluids (2018)

F. A. Cruz and M. A. Alves

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-11-17

Description: Author(s): F. A. Cruz and M. A. Alves Cross-slot devices are routinely used to study the extension of high molecular weight polymer molecules and DNA in solution. We simulate the extensional flow of Boger fluids in an optimised cross-slot rheometer and investigate various emerging time-dependent instabilities. [Phys. Rev. Fluids 3, 113301] Published Fri Nov 16, 2018

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Apparent slip mechanism between two spheres based on solvent rheology: Theory and implication for the shear thinning of non-Brownian suspensions (2018)

A. Vázquez-Quesada, Pep Español, and M. Ellero

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-12-11

Description: Author(s): A. Vázquez-Quesada, Pep Español, and M. Ellero The slip behavior observed experimentally between close spheres is described by an analytical model in terms of the apparent shear-thinning rheology of the solvent. The results compare well with experiments and bridge the hidden solvent shear-thinning theory for suspensions with slip-based models. [Phys. Rev. Fluids 3, 123302] Published Mon Dec 10, 2018

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Viscoelastic fluid-structure interactions between a flexible cylinder and wormlike micelle solution (2018)

Anita A. Dey, Yahya Modarres-Sadeghi, and Jonathan P. Rothstein

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-06-12

Description: Author(s): Anita A. Dey, Yahya Modarres-Sadeghi, and Jonathan P. Rothstein Elastic flow instabilities in the wake of a flexible cylinder can drive the motion of the cylinder, resulting in 1D and 2D oscillations. The time variation of the flow field and the state of stress in the fluid are shown using particle image tracking and flow-induced birefringence images. [Phys. Rev. Fluids 3, 063301] Published Mon Jun 11, 2018

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Characterizing elastic turbulence in channel flows at low Reynolds number (2017)

Boyang Qin and Paulo E. Arratia

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-08-12

Description: Author(s): Boyang Qin and Paulo E. Arratia Flow instabilities have long been observed in viscoelastic fluids, even at low Reynolds numbers. Particle tracking methods are used to compare the turbulentlike features of polymeric solutions flowing in straight microchannels with those in curved geometries. [Phys. Rev. Fluids 2, 083302] Published Thu Aug 10, 2017

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Evaluation of reptation-based modeling of entangled polymeric fluids including chain rotation via nonequilibrium molecular dynamics simulation (2017)

Mohammad Hadi Nafar Sefiddashti, Brian J. Edwards, and Bamin Khomami

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-08-12

Description: Author(s): Mohammad Hadi Nafar Sefiddashti, Brian J. Edwards, and Bamin Khomami Key theoretical variables of the tube model are examined with nonequilibrium molecular dynamics simulations. Although quantifying corresponding physical properties with these variables appears realistic, it is shown that the evolution equations arising from various tube models are not complete for describing flow process dynamics. [Phys. Rev. Fluids 2, 083301] Published Wed Aug 09, 2017

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Experimental evidence of a helical, supercritical instability in pipe flow of shear thinning fluids (2017)

L. Picaut, O. Ronsin, C. Caroli, and T. Baumberger

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-08-15

Description: Author(s): L. Picaut, O. Ronsin, C. Caroli, and T. Baumberger When a viscoelastic, shear-thinning fluid is extruded through a large aspect ratio capillary, it exhibits an inertia free, bulk flow instability resulting in helical undulations of the extrudate. This instability is shown to be supercritical, at odds with that occurring in non-shear-thinning fluids. [Phys. Rev. Fluids 2, 083303] Published Mon Aug 14, 2017

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Analog of discontinuous shear thickening flows under confining pressure (2017)

Junhao Dong and Martin Trulsson

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-08-31

Description: Author(s): Junhao Dong and Martin Trulsson Two-dimensional simulations of a discontinuous shear-thickening suspension shows shear-protocol-dependent flow curves under imposed pressure (e.g., negative dynamic compressibility when increasing the pressure), which can be rationalized by the way the frictional contacts evolve. [Phys. Rev. Fluids 2, 081301(R)] Published Wed Aug 30, 2017

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Shear-induced ordering and crystallization of jammed suspensions of soft particles glasses (2017)

Fardin Khabaz, Tianfei Liu, Michel Cloitre, and Roger T. Bonnecaze

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-09-02

Description: Author(s): Fardin Khabaz, Tianfei Liu, Michel Cloitre, and Roger T. Bonnecaze Jammed suspensions of soft particles are shown to form crystalline or ordered structures depending on shear flow and suspension polydispersity, as in a state diagram. The disordered suspension to ordered structure transition is shear activated. Induction time depends on flow condition and material properties. [Phys. Rev. Fluids 2, 093301] Published Fri Sep 01, 2017

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Analytical structure, dynamics, and coarse graining of a kinetic model of an active fluid (2017)

Tong Gao, Meredith D. Betterton, An-Sheng Jhang, and Michael J. Shelley

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-09-09

Description: Author(s): Tong Gao, Meredith D. Betterton, An-Sheng Jhang, and Michael J. Shelley Starting with Doi-Onsager kinetic theory, an active nematic ” Q -tensor” model is built from the bottom up for suspensions of immotile, but mobile, particles exerting active extensile dipolar stresses on the fluid. The model exhibits collective dynamics and active flows, especially in confined domains. [Phys. Rev. Fluids 2, 093302] Published Fri Sep 08, 2017

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Numerical study of two-dimensional wet foam over a range of shear rates (2017)

T. Kähärä

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-09-09

Description: Author(s): T. Kähärä Simple shear rheology of two-dimensional foam is investigated using the DySMaL model. Low shear rate results are consistent with existing data but at high shear rates the model range of applicability in the context of foams is reached with interesting consequences. [Phys. Rev. Fluids 2, 093303] Published Fri Sep 08, 2017

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Spherical particle sedimenting in weakly viscoelastic shear flow (2017)

Jonas Einarsson and Bernhard Mehlig

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-06-08

Description: Author(s): Jonas Einarsson and Bernhard Mehlig The hydrodynamic force on a sphere sedimenting in a viscoelastic shear flow depends, in a complicated fashion, on both magnitude and orientation of the shear relative to gravity. Drag and lift forces are calculated perturbatively for weak elasticity, for any orientation. [Phys. Rev. Fluids 2, 063301] Published Wed Jun 07, 2017

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Viscous-elastic dynamics of power-law fluids within an elastic cylinder (2017)

Evgeniy Boyko, Moran Bercovici, and Amir D. Gat

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-07-13

Description: Author(s): Evgeniy Boyko, Moran Bercovici, and Amir D. Gat We theoretically model the interaction of a non-Newtonian liquid with an elastic cylinder. For shear-thinning fluids, a step in pressure results in compactly supported propagation of deformation. This is in contrast to Stokes’ problem where such propagation is observed in shear thickening fluids. [Phys. Rev. Fluids 2, 073301] Published Wed Jul 12, 2017

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Role of chain scission in cross-slot flow of wormlike micellar solutions (2017)

Arthur Kalb, Larry A. Villasmil U., and Michael Cromer

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-07-27

Description: Author(s): Arthur Kalb, Larry A. Villasmil U., and Michael Cromer The role of chain scission is investigated numerically in the symmetry breaking of the flow of wormlike micellar solutions in a cross-slot geometry. [Phys. Rev. Fluids 2, 071301(R)] Published Wed Jul 26, 2017

Keywords: Complex and Non-Newtonian Fluids

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Elastic wake instabilities in a creeping flow between two obstacles (2017)

Atul Varshney and Victor Steinberg

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-05-10

Description: Author(s): Atul Varshney and Victor Steinberg In elastic wake in a creeping flow of a dilute polymer solution past two widely separated cylinders, two symmetry-breaking instabilities related to mirroring and time-reversal are found above critical Weissenberg numbers. Vorticity growth up to the cylinder separation length is observed. [Phys. Rev. Fluids 2, 051301(R)] Published Mon May 08, 2017

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Giant deviation of a relaxation time from generalized Newtonian theory in discontinuous shear thickening suspensions (2017)

Rijan Maharjan and Eric Brown

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-12-06

Description: Author(s): Rijan Maharjan and Eric Brown Experimental study on discontinuous shear thickening fluids reveals that the relaxation times agree with a generalized Newtonian model for lower weight fractions. At high weight fractions, however, the relaxation times disagree by up to 4 orders of magnitude. [Phys. Rev. Fluids 2, 123301] Published Tue Dec 05, 2017

Keywords: Complex and Non-Newtonian Fluids

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Growth of viscoelastic wings and the reduction of particle mobility in a viscoelastic shear flow (2017)

William L. Murch, Sreenath Krishnan, Eric S. G. Shaqfeh, and Gianluca Iaccarino

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-10-26

Description: Author(s): William L. Murch, Sreenath Krishnan, Eric S. G. Shaqfeh, and Gianluca Iaccarino The sedimentation of a rigid, spherical particle in a cross sheared elastic fluid is studied. By increasing the shear rate (shear Weissenberg number, Wi), the growth of viscoelastic wake structures, resembling wings, is observed, which are linked to a dramatic decrease in the particle mobility. [Phys. Rev. Fluids 2, 103302] Published Wed Oct 25, 2017

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Polymer concentration and properties of elastic turbulence in a von Karman swirling flow (2017)

Yonggun Jun and Victor Steinberg

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-10-25

Description: Author(s): Yonggun Jun and Victor Steinberg The first systematic study of the effect of polymer concentration, from dilute to entangled, on the elastic instability and elastic turbulence, with information about velocities, torques, and pressures, their power spectra and correlation and structure functions. [Phys. Rev. Fluids 2, 103301] Published Tue Oct 24, 2017

Keywords: Complex and Non-Newtonian Fluids

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Actuated rheology of magnetic micro-swimmers suspensions: Emergence of motor and brake states (2018)

Benoit Vincenti, Carine Douarche, and Eric Clement

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-03-31

Description: Author(s): Benoit Vincenti, Carine Douarche, and Eric Clement We develop a model of elliptical micro-swimmers with a magnetic dipole under shear flow in a dilute suspension subject to a constant magnetic field. We find at finite shear rates transitions to either a motor state in which energy can be extracted or a brake state with high resistance to shear. [Phys. Rev. Fluids 3, 033302] Published Fri Mar 30, 2018

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Effect of a surface tension gradient on the slip flow along a superhydrophobic air-water interface (2018)

Dong Song, Baowei Song, Haibao Hu, Xiaosong Du, Peng Du, Chang-Hwan Choi, and Jonathan P. Rothstein

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-03-31

Description: Author(s): Dong Song, Baowei Song, Haibao Hu, Xiaosong Du, Peng Du, Chang-Hwan Choi, and Jonathan P. Rothstein The presence of a surface tension gradient is demonstrated at the air-water interface supported above a millimeter-sized discontinuous groove. It reduces the slip velocity and in some cases results in an interfacial velocity that is opposite to the main flow direction. [Phys. Rev. Fluids 3, 033303] Published Fri Mar 30, 2018

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Structural state diagram of concentrated suspensions of jammed soft particles in oscillatory shear flow (2018)

Fardin Khabaz, Michel Cloitre, and Roger T. Bonnecaze

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-03-27

Description: Author(s): Fardin Khabaz, Michel Cloitre, and Roger T. Bonnecaze We use simulations of large amplitude oscillating shear flow of jamming concentrated suspensions of soft particles to study the developing internal structure, with transitions between glass to FCC and HCP crystals during the oscillation. [Phys. Rev. Fluids 3, 033301] Published Mon Mar 26, 2018

Keywords: Complex and Non-Newtonian Fluids

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Unsteady sedimentation of a sphere in wormlike micellar fluids (2018)

Yiran Zhang and Susan J. Muller

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-04-10

Description: Author(s): Yiran Zhang and Susan J. Muller Flow transitions in the settling of a sphere in non-shear-banding wormlike micelle solutions are mapped. The onset of unsteady sedimentation correlates with an extensional Deborah number, while the velocity fluctuations are related to a shear Deborah number and an elastic Mach number. [Phys. Rev. Fluids 3, 043301] Published Mon Apr 09, 2018

Keywords: Complex and Non-Newtonian Fluids

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Exploration of thermal counterflow in He II using particle tracking velocimetry (2018)

Brian Mastracci and Wei Guo

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-06-23

Description: Author(s): Brian Mastracci and Wei Guo Particle tracking velocimetry is applied to thermal counterflow in superfluid helium (He II), and the first method for separately analyzing the normal fluid and quantized vortex tangle velocities is presented, opening the door to new quantitative measurements of quantum turbulence. [Phys. Rev. Fluids 3, 063304] Published Fri Jun 22, 2018

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Shear fronts in shear-thickening suspensions (2018)

Endao Han, Matthieu Wyart, Ivo R. Peters, and Heinrich M. Jaeger

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-07-12

Description: Author(s): Endao Han, Matthieu Wyart, Ivo R. Peters, and Heinrich M. Jaeger Snapshot of a propagating shear front that transforms a dense suspension from a fluid into a jammed, solid-like state. A comprehensive description of this transformation is developed, which links the transient dynamics to parameters obtainable from steady-state rheology. [Phys. Rev. Fluids 3, 073301] Published Wed Jul 11, 2018

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Diffusion of self-propelled particles in complex media (2018)

Juan L. Aragones, Shahrzad Yazdi, and Alfredo Alexander-Katz

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-08-03

Description: Author(s): Juan L. Aragones, Shahrzad Yazdi, and Alfredo Alexander-Katz An investigation of the behavior of self-propelled particles in complex media finds a transition from thermal diffusion to collision-driven diffusion as the particle area fraction is increased. Collisions with passive particles increases the rotational diffusion of the self-propelled particles, leading to their “self-trapping.” [Phys. Rev. Fluids 3, 083301] Published Thu Aug 02, 2018

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Viscoelastic flow simulations in model porous media (2017)

S. De, J. A. M. Kuipers, E. A. J. F. Peters, and J. T. Padding

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-05-16

Description: Author(s): S. De, J. A. M. Kuipers, E. A. J. F. Peters, and J. T. Padding Simulations of viscoelastic flows through model porous media show that flow structures are completely different for symmetric and asymmetric configurations at the same porosity. Most energy dissipation is occurring in shear-dominated, not extensional-flow-dominated, regions of the flow domain. [Phys. Rev. Fluids 2, 053303] Published Mon May 15, 2017

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Jetting of a shear banding fluid in rectangular ducts (2017)

Paul F. Salipante, Charles A. E. Little, and Steven D. Hudson

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-03-16

Description: Author(s): Paul F. Salipante, Charles A. E. Little, and Steven D. Hudson An experimental investigation shows, and elaborates the conditions for, jetting flow of a shear banding solution through rectangular channels. Viscoelastic modeling replicates the observed flow transitions and elucidates the role of local stresses. [Phys. Rev. Fluids 2, 033302] Published Tue Mar 14, 2017

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Enhancing shear thickening (2017)

Yasaman Madraki, Sarah Hormozi, Guillaume Ovarlez, Élisabeth Guazzelli, and Olivier Pouliquen

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-03-16

Description: Author(s): Yasaman Madraki, Sarah Hormozi, Guillaume Ovarlez, Élisabeth Guazzelli, and Olivier Pouliquen Adding large non-Brownian particles to a cornstarch suspension moves the discontinuous shear-thickening transition to lower critical shear rates, allowing control of shear-thickening properties by varying large-particle concentration, while the stress at the transition is little changed. [Phys. Rev. Fluids 2, 033301] Published Mon Mar 13, 2017

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Flow of viscoelastic fluids around a sharp microfluidic bend: Role of wormlike micellar structure (2017)

Margaret Y. Hwang, Hadi Mohammadigoushki, and Susan J. Muller

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-04-29

Description: Author(s): Margaret Y. Hwang, Hadi Mohammadigoushki, and Susan J. Muller Flow transitions for wormlike micelle solutions and solutions of linear polymers flowing around a microfluidic 90˚ bend are compared. The first transition in all fluids is at similar Weissenberg number, but the form of secondary flow and higher transitions depend on the wormlike micellar structure. [Phys. Rev. Fluids 2, 043303] Published Thu Apr 27, 2017

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Q-tensor model for electrokinetics in nematic liquid crystals (2017)

O. M. Tovkach, Christopher Conklin, M. Carme Calderer, Dmitry Golovaty, Oleg D. Lavrentovich, Jorge Viñals, and Noel J. Walkington

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-05-06

Description: Author(s): O. M. Tovkach, Christopher Conklin, M. Carme Calderer, Dmitry Golovaty, Oleg D. Lavrentovich, Jorge Viñals, and Noel J. Walkington A general model for a nematic electrolyte with spatially varying tensor order parameter is derived based on Onsager’s variational principle. The model is verified by considering liquid crystal-enabled electro-osmotic flow around a stationary spherical dielectric particle with homeotropic anchoring. [Phys. Rev. Fluids 2, 053302] Published Fri May 05, 2017

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Frozen fronts selection in flow against self-sustained chemical waves (2017)

T. Chevalier, D. Salin, and L. Talon

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-04-26

Description: Author(s): T. Chevalier, D. Salin, and L. Talon Autocatalytic reaction fronts between two reacting species propagate as solitary waves (from right to left here). A forced flow from left to right can balance chemical waves leading to frozen fronts. [Phys. Rev. Fluids 2, 043302] Published Mon Apr 24, 2017

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Streak instability in viscoelastic Couette flow (2017)

L. Biancofiore, L. Brandt, and T. A. Zaki

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-04-29

Description: Author(s): L. Biancofiore, L. Brandt, and T. A. Zaki Bypass transition in wall-bounded flows is delayed upon addition of polymers. A torque is established by the polymer forces and opposes the local vorticity, thus weakening the amplification of streaks and delaying transition. [Phys. Rev. Fluids 2, 043304] Published Fri Apr 28, 2017

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Purely elastic instabilities in a microfluidic flow focusing device (2017)

P. Ballesta and M. A. Alves

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-05-05

Description: Author(s): P. Ballesta and M. A. Alves Complex fluids generate different types of flow instabilities with increasing flow rate under inertialess flow conditions in a flow focusing device. [Phys. Rev. Fluids 2, 053301] Published Thu May 04, 2017

Keywords: Complex and Non-Newtonian Fluids

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Nonuniform flow in soft glasses of colloidal rods (2017)

J. K. G. Dhont, K. Kang, H. Kriegs, O. Danko, J. Marakis, and D. Vlassopoulos

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-04-12

Description: Author(s): J. K. G. Dhont, K. Kang, H. Kriegs, O. Danko, J. Marakis, and D. Vlassopoulos An investigation of nonuniform flow profiles in soft glasses of colloidal rods finds that plug flow and internal fracture occur at low shear rates, gradient-banding at intermediate rates, and uniform flow at high rates. [Phys. Rev. Fluids 2, 043301] Published Tue Apr 11, 2017

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Pressure-dependent surface viscosity and its surprising consequences in interfacial lubrication flows (2017)

Harishankar Manikantan and Todd M. Squires

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-02-14

Description: Author(s): Harishankar Manikantan and Todd M. Squires Qualitatively new phenomena occur in the flow of surfactant-laden interfaces, where surfactant surface viscosity depends on concentration. These include “choking” of flow through a narrow channel, an upper bound on squeezing flow velocity, and kinematically irreversible particle dynamics near walls. [Phys. Rev. Fluids 2, 023301] Published Thu Feb 09, 2017

Keywords: Complex and Non-Newtonian Fluids

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Development of magnetic liquid metal suspensions for magnetohydrodynamics (2017)

Florian Carle, Kunlun Bai, Joshua Casara, Kyle Vanderlick, and Eric Brown

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-01-31

Description: Author(s): Florian Carle, Kunlun Bai, Joshua Casara, Kyle Vanderlick, and Eric Brown Magnetic and nonmagnetic particles are suspended in liquid metals to obtain a fluid with high magnetic susceptibility, high electrical conductivity, and tunable viscosity. These properties will allow magnetohydrodynamic experiments over a wider parameter range than liquid metals alone. [Phys. Rev. Fluids 2, 013301] Published Mon Jan 30, 2017

Keywords: Complex and Non-Newtonian Fluids

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Taylor-Couette instability in thixotropic yield stress fluids (2017)

Mathieu Jenny, Sébastien Kiesgen de Richter, Nicolas Louvet, Salahedine Skali-Lami, and Yvan Dossmann

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-02-14

Description: Author(s): Mathieu Jenny, Sébastien Kiesgen de Richter, Nicolas Louvet, Salahedine Skali-Lami, and Yvan Dossmann According to Houska’s structural parameter model, shear banding may appear in the flow of nonviscoelastic, thixotropic yield stress fluids. New work shows that the linear stability analysis leads to similar results as in Bingham-like fluids. [Phys. Rev. Fluids 2, 023302] Published Fri Feb 10, 2017

Keywords: Complex and Non-Newtonian Fluids

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Steady displacement of long gas bubbles in channels and tubes filled by a Bingham fluid (2018)

Parsa Zamankhan, Shuichi Takayama, and James B. Grotberg

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-01-26

Description: Author(s): Parsa Zamankhan, Shuichi Takayama, and James B. Grotberg Creeping motion of a long bubble in 2D planar channels and axisymmetric tubes filled by a Bingham fluid is studied numerically. Bingham and capillary number effects on bubble shape, flow field, yield surfaces, and the wall shear stress profile are discussed and applied to human respiratory airways. [Phys. Rev. Fluids 3, 013302] Published Thu Jan 25, 2018

Keywords: Complex and Non-Newtonian Fluids

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Two-dimensional dynamics of elasto-inertial turbulence and its role in polymer drag reduction (2018)

S. Sid, V. E. Terrapon, and Y. Dubief

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-02-01

Description: Author(s): S. Sid, V. E. Terrapon, and Y. Dubief Direct numerical simulations of a FENE-P fluid in both two- and three-dimensional straight periodic channels find that elasto-inertial turbulence is fundementally two-dimensional. The spurious effect of artificial diffusion of the polymer is demonstrated. [Phys. Rev. Fluids 3, 011301(R)] Published Wed Jan 31, 2018

Keywords: Complex and Non-Newtonian Fluids

Electronic ISSN: 2469-990X

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Shear-induced migration and orientation of rigid fibers in an oscillatory pipe flow (2018)

Scott Strednak, Saif Shaikh, Jason E. Butler, and Élisabeth Guazzelli

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-09-11

Description: Author(s): Scott Strednak, Saif Shaikh, Jason E. Butler, and Élisabeth Guazzelli Fibers in suspension migrate towards the center of the pipe where they are more aligned with the flow. The migration depends on the fraction of the volume of the suspension swept out by the rotating fibers. [Phys. Rev. Fluids 3, 091301(R)] Published Mon Sep 10, 2018

Keywords: Complex and Non-Newtonian Fluids

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Time-dependent active microrheology in dilute colloidal suspensions (2018)

Sebastian Leitmann, Suvendu Mandal, Matthias Fuchs, Antonio M. Puertas, and Thomas Franosch

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-10-12

Description: Author(s): Sebastian Leitmann, Suvendu Mandal, Matthias Fuchs, Antonio M. Puertas, and Thomas Franosch An exact analytic solution is derived for the dynamic response of a probe particle in a dilute colloidal suspension exposed to a strong step force. [Phys. Rev. Fluids 3, 103301] Published Thu Oct 11, 2018

Keywords: Complex and Non-Newtonian Fluids

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Effect of stretching-induced changes in hydrodynamic screening on coil-stretch hysteresis of unentangled polymer solutions (2017)

Ranganathan Prabhakar, Chandi Sasmal, Duc At Nguyen, Tam Sridhar, and J. Ravi Prakash

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-01-12

Description: Author(s): Ranganathan Prabhakar, Chandi Sasmal, Duc At Nguyen, Tam Sridhar, and J. Ravi Prakash Extensional rheometry and Brownian dynamics simulations of flexible polymer solutions demonstrate that chain stretching strengthens intermolecular hydrodynamic screening in dilute solutions, but weakens it in semidilute solutions. [Phys. Rev. Fluids 2, 011301(R)] Published Thu Jan 05, 2017

Keywords: Complex and Non-Newtonian Fluids

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Computationally efficient algorithms for Brownian dynamics simulation of long flexible macromolecules modeled as bead-rod chains (2017)

Mahdy Malekzadeh Moghani and Bamin Khomami

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-02-18

Description: Author(s): Mahdy Malekzadeh Moghani and Bamin Khomami An efficient algorithm for temporal evolution of the bead-rod model of polymeric chains and a method to estimate transient polymer contributions to the stress tensor provide insight into the dynamics and rheological behavior of dilute polymeric solutions of long flexible chains with hydrodynamic interactions. [Phys. Rev. Fluids 2, 023303] Published Fri Feb 17, 2017

Keywords: Complex and Non-Newtonian Fluids

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Viscoplastic squeeze flow between two identical infinite circular cylinders (2018)

A. R. Koblitz, S. Lovett, and N. Nikiforakis

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-03-06

Description: Author(s): A. R. Koblitz, S. Lovett, and N. Nikiforakis The interstitial squeeze flow between two approaching circular cylinders in a viscoplastic medium is studied numerically and semi-analytically. Yield stress effects external to the gap—not picked up by viscoplastic lubrication theory—are found to significantly affect the lubrication pressure. [Phys. Rev. Fluids 3, 023301] Published Wed Feb 28, 2018

Keywords: Complex and Non-Newtonian Fluids

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Einstein viscosity with fluid elasticity (2018)

Jonas Einarsson, Mengfei Yang, and Eric S. G. Shaqfeh

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2018-01-17

Description: Author(s): Jonas Einarsson, Mengfei Yang, and Eric S. G. Shaqfeh Adding a small amount of rigid particles to a viscoelastic fluid leads to interesting suspension rheology, because the gradients near the particles induce elastic stresses in the fluid phase. We derive the viscosity of a dilute suspension of spheres by perturbation theory for a weakly elastic fluid. [Phys. Rev. Fluids 3, 013301] Published Tue Jan 16, 2018

Keywords: Complex and Non-Newtonian Fluids

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Silo outflow of soft frictionless spheres (2017)

Ahmed Ashour, Torsten Trittel, Tamás Börzsönyi, and Ralf Stannarius

American Physical Society (APS)

In: Physical Review Fluids

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Publication Date: 2017-12-14

Description: Author(s): Ahmed Ashour, Torsten Trittel, Tamás Börzsönyi, and Ralf Stannarius Outflow of granular material from containers with small orifices is a ubiquitous phenomenon. A study using hydrogel spheres as templates of soft particles shows that the softness of the grains has considerable consequences: it changes the macroscopic dynamics qualitatively. [Phys. Rev. Fluids 2, 123302] Published Wed Dec 13, 2017

Keywords: Complex and Non-Newtonian Fluids

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