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Experimental search for the effect of compressibility in unsteady Couette flow

Published online by Cambridge University Press:  28 March 2006

Leslie Hromas
Affiliation:
Purdue University, Lafayette, Indiana
Harold Degroff
Affiliation:
Purdue University, Lafayette, Indiana

Abstract

Solution of the compressible Rayleigh problem involving an impulsively moved flat plate indicates that transverse velocities can be generated by a purely longitudinal shearing motion. It would be desirable to demonstrate the existence of these waves, and to do so was the motivation for the present investigation. However, the geometry for the Rayleigh problem is prohibitive; and since it was noticed that a similar behaviour should occur for the case of unsteady compressible Couette flow, this was considered for the present investigation. An experimental search for the existence of the transverse velocities was conducted using concentric rotating cylinders to generate the flow. Since these transverse velocities were too small to be measured directly, a temperature gradient was created across the annulus to take advantage of the much greater sensitivity of a hot-wire to temperature fluctuations produced by the fluctuation in the transverse velocity. The periodic temperature fluctuations noted were converted to equivalent transverse velocities. Experimental values obtained agreed qualitatively with the theory. Finally, the role of extraneous effects in the experimental apparatus was considered.

Type
Research Article
Copyright
© 1959 Cambridge University Press

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References

DeGroff, H. M. 1955 Purdue University Rep. no. A-55-3.
DeGroff, H. M. 1956 J. Aero. Sci. 23, 395.
Howarth, L. 1951 Quart. J. Mech. Appl. Math. 4, 157.
Hromas, L. A. & Kentzer, C. P. 1955 Proc. 4th Midwest Conf. on Fluid Mech. p. 23.
Hromas, L. A. & Thompson, T. R. 1956 Purdue University Rep. no. A-56-3.
Illingworth, C. R. 1950 Proc. Camb. Phil. Soc. 46, 603.
Stewartson, K. 1955 Proc. Camb. Phil. Soc. 51, 202.
Van Dyke, M. D. 1952 Z. Angew. Math. Phys. 3, 343.