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On flow visualization using reflective flakes

Published online by Cambridge University Press:  20 April 2006

Ö. Savaş
Ö. Savaş
Affiliation:
School of Aerospace, Mechanical, and Nuclear Engineering, University of Oklahoma, Norman, OK 73019
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Abstract

An analysis of flow visualization using small reflective flakes is introduced. This rational analysis is based on a stochastic treatment of Jeffery's (1922) solution for the motion of ellipsoidal particles in a viscous fluid, wherein thin flakes tend to align with stream surfaces. The predicted light fields are confirmed by examples of parallel flows, the flow over a rotating disk, and the spinup from rest in a cylindrical cavity. The Tollmien–Schlichting wave packet trailing a turbulent spot is taken as an example to discuss the suitability of the technique for visualizing small-amplitude waves. Attenuation of light through a suspension is described.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 152 , March 1985 , pp. 235 - 248
Copyright
© 1985 Cambridge University Press

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References

Batchelor, G. K. 1967 An Introduction to Fluid Dynamics. Cambridge University Press.
Cantwell, B., Coles, D. & Dimotakis, P. 1978 Structure and entrainment in the plane of symmetry of a turbulent spot. J. Fluid Mech. 87, 641–672.Google Scholar
Carlson, D. R., Widnall, S. E. & Peeters, M. F. 1982 A flow-visualization study of transition in plane Poiseuille flow. J. Fluid Mech. 121, 487–505.Google Scholar
Chambers, F. W. & Thomas, A. S. W. 1983 Turbulent spots, wave packets, and growth. Phys. Fluids 26, 1160–1162.Google Scholar
Coles, D. 1965 Transition in circular Couette flow. J. Fluid Mech. 21, 385–425.Google Scholar
Goldsmith, H. L. & Mason, S. G. 1962 Particle motions in sheared suspensions XIII. The spin and rotation of disks. J. Fluid Mech. 12, 88–96.Google Scholar
Greenspan, H. P. 1968 The Theory of Rotating Fluids. Cambridge University Press.
Jeffery, G. B. 1922 The motion of ellipsoidal particles immersed in a viscous fluid. Proc. R. Soc. Land. A 102, 161–179.Google Scholar
Leal, L. G. & Hinch, E. J. 1971 The effect of weak Brownian rotations on particles in shear flow. J. Fluid Mech. 46, 685–703.Google Scholar
Leal, L. G. & Hinch, E. J. 1972 The rheology of a suspension of nearly spherical particles subject to Brownian rotations. J. Fluid Mech. 55, 745–765.Google Scholar
Papoulis, A. 1984 Probability, Random Variables, and Stochastic Processes, 2nd ed. McGraw-Hill.
Rogers, M. H. & Lance, G. N. 1960 The rotationally symmetric flow of a viscous fluid in the presence of an infinite rotating disk. J. Fluid Mech. 7, 617–631.Google Scholar
Van Dyke, M. 1982 An Album of Fluid Motion. The Parabolic Press.
Weidman, P. D. 1976 On the spin-up and spin-down of a rotating fluid. Part 2. Measurements and stability. J. Fluid Mech. 77, 709–735.Google Scholar
Wygnanski, I., Haritonidis, J. H. & Kaplan, R. E. 1979 On a Tollmien-Schlichting wave packet produced by a turbulent spot. J. Fluid Mech. 92, 505–528.Google Scholar