Drifting Convection Rolls Induced by Spatial Modulation
A sinusoidal variation of the height of a convection channel gives rise to the onset of time dependent convection. The drift rate of the convection rolls is proportional to the amplitude of the modulation, to the sine of the phase difference between the modulation at the upper and lower boundary and to the amount of asymmetric properties of the convecting fluid such as the curvature in the temperature dependence of the density. These results have been obtained experimentally through the measurement of convection in an annular channel heated from below.
KeywordsRayleigh Number Drift Rate Spatial Modulation Annular Channel Sinusoidal Modulation
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- Pal, D., and Kelly, R.E., 1978: Thermal Convection With Spatially Periodic Nonuniform Heating: Nonresonant Wavelength Excitation, pp. 235–238 in “Heat Transfer 1978” (Proc. Int. Heat Transfer Conf.), Vol. 2.Google Scholar