The onset of natural convection and heat transfer correlation in horizontal fluid layer heated uniformly from below |
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Authors: | Min Chan Kim Sin Kim |
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Affiliation: | 1. Department of Chemical Engineering, Cheju National University, 690-756, Cheju-do, Korea 2. Department of Nuclear and Energy Engineering, Cheju National University, 690-756, Cheju-do, Korea
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Abstract: | The critical condition of the onset of buoyancy-driven convective motion of uniformly heated horizontal fluid layer was analysed by the propagation theory which transforms the disturbance quantities similarly. The dimensionless critical time,τ c , is obtained as a function of the Rayleigh number and the Prandtl number. Based on the stability criteria and the boundary-layer instability model, a new heat transfer correlation which can cover whole range of Rayleigh number was derived. Our theoretical results predict the experimental results quite reasonably. |
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