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On the transition to turbulent convection. Part 2. The transition to time-dependent flow

Published online by Cambridge University Press:  29 March 2006

Ruby Krishnamurti
Ruby Krishnamurti
Affiliation:
Geophysical Fluid Dynamics Institute, Florida State University
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Abstract

The Rayleigh number at which steady convective flow changes to time-dependent flow is determined experimentally for several fluids with Prandtl numbers from 1 to 104. The time dependence is of two forms: (i) a slow tilting of the cell boundary, with time scale of the vertical thermal diffusion time, (ii) an oscillation with a faster time scale determined by the orbit time of the fluid around the cell. The nature of this oscillation is one of hot (or cold) spots advected with the original cellular motion. At a fixed point in the fluid this produces a time periodic oscillation of the temperature. A discrete change of slope of the heat flux curve accompanies this transition. As the Rayleigh number is increased, transition to disorder is seen to result from an increase in the frequency and number of these oscillations.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 42 , Issue 2 , 22 June 1970 , pp. 309 - 320
Copyright
© 1970 Cambridge University Press

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