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Vorticity expulsion by turbulence: astrophysical implications of an Alka-Seltzer experiment

Published online by Cambridge University Press:  28 March 2006

D. O. Gough  and
D. Lynden-Bell
D. O. Gough
Affiliation:
Department of Astronomy, Columbia University, New York
D. Lynden-Bell
Affiliation:
Royal Greenwich Observatory, Herstmonceux Castle, Hailsham, Sussex
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Abstract

Arguments are given which suggest that the mean flow of a turbulent fluid is irrotational far from the boundaries. Mathematical difficulties precluded a detailed theory so a simple experiment was performed. This experiment qualitatively confirmed the suggestion. Other well-known experiments on the mean flow of turbulent fluid may also be interpreted in terms of vorticity expulsion, an idea closely related to Scorer's hypothesis on turbulent mixing.

Theoretical papers on stellar rotation usually assume that convective regions rotate uniformly because of a high turbulent viscosity. However, if vorticity expulsion occurs, convective stellar cores will not rotate. The concept of a turbulent viscosity is criticized.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 32 , Issue 3 , 24 May 1968 , pp. 437 - 447
Copyright
© 1968 Cambridge University Press

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