Effect of buoyancy force on horizontal fluctuating flow
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The effect of buoyancy force on the flow and heat transfer from a semi-infinite horizontal flat plate, when the free stream oscillates about a non-zero mean, is analysed. Separate solutions valid for low and high frequency ranges are developed. It is found that for low frequencies, the oscillating component of the rate of heat transfer from the plate lags behind the free stream fluctuations by г/2 and its amplitude decreases with the increase of buoyancy effects. The phase lead in the skin-friction fluctuations increases with buoyancy effects. For very high frequencies, the rate of heat transfer has a phase lead of 135° over the free stream oscillations and the skin-friction has a phase lead of 45°.
KeywordsHeat Transfer Boundary Layer Buoyancy Force Free Stream Buoyancy Effect
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