Abstract
The effects of a tandem set of large eddy breakup (LEBU) devices on the diffusion of drag-reducing polymer solution and of water injected into a turbulent boundary layer flow have been studied. Laser Doppler velocimeter measurements were taken in the LEBU modified boundary layer with and without polymer injection. A laser-induced fluorescence technique was used to examine the development of concentration profiles of the injected fluids with increasing distance from the injection slot for a range of injection rates. The diffusion rate of water, a passive contaminant, was diminished by the LEBU devices over a distance of only 10 to 15 boundary layer thicknesses before returning to the case of an unmodified flow; whereas the devices did have a major effect on the diffusion of polymer over the entire streamwise distance studied compared to the case of an unmodified flow. Large reductions of turbulent normal and shear stresses were observed downstream of the devices, especially with polymer injection.
Similar content being viewed by others
References
Anders, J. B.; Watson, R. D. 1985: Airfoil large-eddy breakup devices for turbulent drag reduction. Paper No. AIAA-85-0520, 1–11
Berman, N. S. 1978: Drag reduction by polymers. Annu. Rev. Fluid Mech. 10, 47–64
Brungart, 10, T. A. 1990: A laser-induced fluorescence technique for measurement of slot-injected fluid concentration profiles in a turbulent boundary layer. Master's Thesis, Penn. State University
Brungart, T. A.; Harbison, W. L.; Petrie, H. L.; Merkle, C. L. 1991: A fluorescence technique for measurement of slot-injected fluid concentration profiles in a turbulent boundary layer. Exp. Fluids 11, 9–16
Bushnell, D. M. 1985: Turbulent drag reduction for external flows. Aircraft Drag Prediction and Reduction, AGARD R-723, 5–1 to 5–13
Chang, S.; Blackwelder, R. F. 1990: Modification of large eddies in turbulent boundary layers. J. Fluid Mech. 213, 419–442
Corke, T. C.; Guezennec, Y.; Nagib, H. M. 1979: Modification in drag of turbulent boundary layers resulting from manipulation of large-scale structures. Viscous Flow Drag Reduction, Prog. Astronaut. Aeronaut. 72, 128–143
Fontaine, A. A.; Petrie, H. L.; Brungart, T. A. 1990: Modification to a turbulent boundary layer due to slot injected drag reducing polymer solutions. ASME Forum on Turbulent Flows, FED vol. 94, Toronto, Ontario, Canada, 43–50
Fruman, D. H.; Marshall, P. T. 1976: Diffusion of a tangential drag-reducing polymer injection of a flat plate at high Reynolds numbers. J. Ship Res. 20, 3, 171–180
Guezennec, Y. G.; Nagib, H. M. 1990: Mechanisms leading to net drag reduction in manipulated turbulent boundary layers. AIAA J. 28, 245–252
Koochesfahani, M. M.; Dimotakis, P. E. 1985: Laser-induced fluorescence measurements of mixed fluid concentration in a liquid plane shear layer. AIAA J. 23, 11, 1700–1707
Latto, B.; El Riedy, O. K. F. 1976: Diffusion of polymer additives in a developing turbulent boundary layer. J. Hydronaut. 10, 4, 135–139
Lauchle, G. C.; Billet, M. L.; Deutsch, S. 1989: High-Reynolds number liquid flow measurements. Lect. Notes Eng. 46, 95–157
Lumley, J. L. 1969: Drag reduction by additives. Ann. Rev. of Fluid Mech. 1, 367–384
Park, J. T. 1988: Flow visualization of a manipulated turbulent boundary layer: Interaction of a tandem large-eddy breakup device and wall-injection of a drag-reducing polymer solution. Proc. Symp. Hydrodyn. Perform. Enhancem. for Mar. Applic. 169–179
Plesniak, M. W.; Nagib, H. M. 1985: Net drag reduction in turbulent boundary layers resulting from optimized manipulation. Paper no. AIAA-85-0518, 1–11
Poreh, M.; Cermak, J. E. 1964: Study of diffusion from a line source in a turbulent boundary layer. Int. J. Heat Mass Transf. 7, 1083–1095
Riedy, L. W.; Mautner, T. S. 1986: Turbulent boundary layer modification in high-speed water flow using large-eddy breakup devices. Technical Note 1445, Naval Oceans Systems Center, 1–29
Sahlin, A.; Alfredsson, P. H.; Johansson, A. V. 1986: Direct drag measurements for a flat pate with passive boundary layer manipulators. Phys. Fluids 29, 3, 696–700
Sahlin, A.; Johansson, A. V.; Alfredsson, P. H. 1988: The possibility of drag reduction by outer layer manipulators in turbulent boundary layers. Phys. Fluids 31, 10, 2815–2820
Savill, A. M.; Mumford, J. C. 1988: Manipulation of turbulent boundary layers by outer-layer devices; skin friction and flowvisualization results. J. Fluid Mech. 191, 389–418
Sommer, S. T. 1991: A study of the diffusion of slot-injected dragreducing polymer solution in a turbulent boundary layer modified by large-eddy break-up devices. Master's Thesis, Penn State University
Spalding, D. B., 1960: A single formula for the law of the wall. Trans ASME E: Appld. Mech. 28, 455–458
Tennekes, H.; Lumley, J. L. 1972: A first course in turbulence. The Massachusetts Institute of Technology
Toms, B. A. 1948: Some observations on the flow of linear polymer solutions through straight tubes at large Reynolds numbers. Proceedings, First Int. Congr. Rheol. 2, 135–141
Trigui, N.; Guezennec, Y. G. 1990: Turbulence modification by large eddy breakup devices in a passively heated turbulent boundary layer. ASME Forum on Turbulent Flows, FED vol. 94, Toronto, Ontario, Canada, 17–22
Walker, D. T.; Tiederman, W. G. 1989: The concentration field in a turbulent channel flow with polymer injection at the wall. Exp. Fluids 8, 86–94
Westphal, R. V. 1986: Skin friction and Reynolds stress measurements for a turbulent boundary layer following manipulation using flat plates. Paper no. AIAA-86-0283, 1–9
Wu, I; Tulin, M. P. 1972: Drag reduction by ejecting additive solutions into pure-water boundary layer. J. Basic Eng. 749–756
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Sommer, S.T., Petrie, H.L. Diffusion of slot injected drag-reducing polymer solution in a LEBU modified turbulent boundary layer. Experiments in Fluids 12, 181–188 (1992). https://doi.org/10.1007/BF00188257
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00188257