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  • 1
    Electronic Resource
    Electronic Resource
    Electrohydrodynamics: A Review of the Role of Interfacial Shear Stresses (1969)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Fluid Mechanics 1 (1969), S. 111-146 
    Details
    ISSN: 0066-4189
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.fl.01.010169.000551
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Smoothing the electromagnetic heating pattern in polymers (1985)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 25 (1985), S. 289-294 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: In the production of polymers, particles and fibers are often added for coloring and/or improvement of mechanical, electrical, and thermal properties. Carefully choosing the electrical properties and size of these additives can allow manipulation of the electrical properties of the composite so that the material can then be heated in both the electric and magnetic fields. Heating can be induced by fields at microwave frequences, where the electric and magnetic fields tend to be concentrated in different regions, or by fields that are quasistatic. These features add a degree of freedom in smoothing the total heating pattern. Models for predicting the electrical properties with the addition of particles or fibers are developed and verified experimentally. Engineering guidelines are established in choosing the electrical properties and size of the additives. Experimentally, a rectangular cavity at 2.45 GHz is used to heat a casting resin with a 5.7 micrometer aluminum powder additive, demonstrating the dramatic smoothing in the heating, pattern made possible by using these additives. Some examples are also suggested to indicate the use of this technique in quasistatic heating configurations.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760250507
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  • 3
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    Electrohydrodynamic mixing and instability induced by co-linear fields and conductivity gradients (1977)
    American Institute of Physics
    Details
    Publication Date: 1977-01-01
    Print ISSN: 0031-9171
    Topics: Physics
    Published by American Institute of Physics
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  • 4
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    Surface Electrohydrodynamics with High-Frequency Fields (1965)
    American Institute of Physics
    Details
    Publication Date: 1965-01-01
    Print ISSN: 0031-9171
    Topics: Physics
    Published by American Institute of Physics
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  • 5
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    Field induced mixing across a diaphragm (1976)
    American Institute of Physics
    Details
    Publication Date: 1976-01-01
    Print ISSN: 0031-9171
    Topics: Physics
    Published by American Institute of Physics
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  • 6
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    Electrohydrodynamics: A Review of the Role of Interfacial Shear Stresses (1969)
    Annual Reviews
    Details
    Publication Date: 1969-01-01
    Print ISSN: 0066-4189
    Electronic ISSN: 1545-4479
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Annual Reviews
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  • 7
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    Stability and dynamics of rotating dielectrophoretic equilibria (1969)
    Cambridge University Press
    Details
    Publication Date: 1969-10-06
    Description: In the design of dielectrophoretic liquid orientation and expulsion systems for zero-gravity environments, maximum electromechanical effect of an imposed electric field is obtained by concentrating the field gradients in the neighbourhood of liquid interfaces. In typical configurations, the electric field gradient plays the role of an electromechanical wall, with a stiffness and inertia represented dynamically by electrohydrodynamic surface waves. As an orientation system rotates, the liquid motions are characterized by these waves as they couple to inertial bulk oscillations and centrifugal surface waves resulting from the rotation. A study is made of configurations typified by an equilibrium in which a circular cylindrical column of inviscid liquid undergoes rigid body rotation. The equilibrium is made possible, even though the cylindrical interface is bounded from outside only by its vapour, because the interface is stressed by an essentially tangential axial electric field intensity, with a strong gradient in the radial direction. Dispersion equations are developed for the electrohydrodynamic centrifugal waves of small amplitude. Conditions for incipience of instability and the frequencies of normal modes of oscillation are given. Experimental observations, which demonstrate the destabilizing influence of the rotation and the effect of rotation and electric field intensity on the normal mode frequencies, are in satisfactory agreement with the theory.
    Print ISSN: 0022-1120
    Electronic ISSN: 1469-7645
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Cambridge University Press
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  • 8
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    Instability of a planar liquid layer in an alternating magnetic field (1982)
    Cambridge University Press
    Details
    Publication Date: 1982-01-01
    Description: Liquid metal interfaces, stressed by a high-frequency, alternating magnetic field are commonly observed to undulate. Even a planar interface stressed from above by a uniform magnetic field takes on an appearance that is very different from what is observed if the same layer is heated from below with about the same thermal input as associated with the eddy currents. This behaviour affects internal mixing and the transport of heat and material from interfaces. In applications where the interface is used to form glass or other materials, the undulations can be disasterous. A goal of this paper is to identify the circumstances under which this motion can be avoided. A theoretical model is developed for fluid motions, coupled to a magnetic flux density (having magnitude B0 and angular frequency w) through a force density that is time averaged over one period of the alternating field. This theory, which does not include thermal effects, predicts a threshold for onset of instability determined by the ratio of layer thickness to skin depth and by the parameter [formula omitted] where [formula omitted] and n is the viscosity. The instability has an internal nature in that it is predicted even when the liquid is bounded by rigid insulating materials. Threshold measurements are reported that agree with the predictions over more than an order-of-magnitude variation in frequency, including low frequencies, for which the finite depth of the liquid layer is important. However, observed growth times are far shorter than predicted. It is concluded that the observed motions are in fact thermally driven, but take on an appearance dictated by the hydromagnetics. A previously developed lumped parameter model, which includes thermally driven motion, does predict growth times on the order of those observed. In the lumped parameter model the critical field strength grossly affects the nonlinear saturation velocity. The critical M sets an upper limit on the extent to which a liquid metal can be levitated, depressed or transported magnetically at a given frequency without incurring interfacial undulations and an augmentation of mass and heat transfer. © 1982, Archives Europeennes de Sociology. All rights reserved.
    Print ISSN: 0022-1120
    Electronic ISSN: 1469-7645
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Cambridge University Press
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  • 9
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    Review of the I.U.T.A.M.–-I.U.P.A.P. Symposium on Electrohydrodynamics (1970)
    Cambridge University Press
    Details
    Publication Date: 1970-02-18
    Description: A Symposium on Electrohydrodynamics sponsored by the International Unions of Theoretical and Applied Mechanics and of Pure and Applied Physics was convened at the Massachusetts Institute of Technology, Cambridge, Massachusetts, from 31 March to 1–2 April 1969. Authors from eight countries presented 44 papers to an invited audience of 112. The presentations illustrated the spectrum of scientific and engineering interests in the interactions of electric fields and moving fluids. Papers were grouped in seven sessions with the following titles: Steady flows; Bulk stability and dynamics; Interfacial dynamics: Static and steady-flow equilibria; Interfacial dynamics and stability: Drops; Basic formulation; Generation and other applications; Aerosol charging and dynamics. It is expected that the majority of authors will publish their papers in the formal literature. This brief review gives only an over-view of the Symposium as seen by the author. © 1970, Cambridge University Press. All rights reserved.
    Print ISSN: 0022-1120
    Electronic ISSN: 1469-7645
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Cambridge University Press
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  • 10
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    Electrohydrodynamics of a current-carrying semi-insulating jet (1971)
    Cambridge University Press
    Details
    Publication Date: 1971-05-14
    Description: A quasi-one-dimensional non-linear model is developed for the axisymmetric dynamics. Streaming is coaxial with a cylindrical ‘wall’ supporting a potential having a linear axial dependence. In addition to a tangential field due to an axial current, the stream surface supports charges in proportion to the stream-wall potential difference; hence it is driven by normal and shear electric stresses. Free charge and polarization waves compete with the destabilizing effect of capillarity. With supercritical steady flow (the local jet velocity exceeds the wave velocity), it is found that the stream accelerates or decelerates in accordance with whether an equivalent longitudinal force density is respectively positive or negative. With subcritical flow, the effect of the force is reversed. Experiments demonstrate accelerating and decelerating flow régimes. Model and experiment are in agreement with regard to choking at a critical radius, and the dependence of radius and potential on position. Hysteretic switching between flow régimes is obtained by adjustment of stream and wall potentials, and is explained in terms of the model. © 1971, Cambridge University Press. All rights reserved.
    Print ISSN: 0022-1120
    Electronic ISSN: 1469-7645
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Cambridge University Press
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