On the Roughness Reynolds Number Transition Criterion

Author:

Masad J. A.1

Affiliation:

1. High Technology Corp., 28 Research Drive, Hampton, VA 23666

Abstract

The theoretically validated Fage’s transition criterion for predicting transition in flow over a single roughness element is used to show that in the widely used roughness Reynolds number (Rek) transition criterion, the critical value of Rek depends strongly on the length of the roughness element. At roughness length where the criterion is valid, the variation of the roughness height with free-stream Reynolds number is quantified.

Publisher

ASME International

Subject

Mechanical Engineering

Reference7 articles.

1. Fage, A., 1943, “The Smallest Size of Spanwise Surface Corrugation Which Affect Boundary Layer Transition on an Airfoil,” British Aeronautical Research Council, Report and Memoranda No. 2120.

2. Fage A. , and PrestonJ. H., 1941, “On Transition from Laminar to Turbulent Flow in the Boundary Layer,” Proceedings of the Royal Society of London, Vol. 178, pp. 201–227.

3. Hansman, R. J., 1993, “Microphysical Factors Which Influence Ice Accretion,” Proceedings of the First Bombardier International Workshop on Aircraft Icing and Boundary-Layer Stability and Transition, I. Paraschivoiu, ed., ISBN 2-553-00422-2, pp. 86–103.

4. Masad J. A. , and IyerV., 1994, “Transition Prediction and Control in Subsonic Flow Over a Hump,” Phys. Fluids, Vol. 6, No. 1, pp. 313–327. Also NASA CR-4543, Sept. 1993.

5. Masad, J. A., and Malik, M. R., 1994, “On the Link Between Flow Separation and Transition Onset,” AIAA Paper No. 94-2370.

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