Abstract
Moderate Rayleigh number thermal convection for horizontal rectangular enclosure is experimentally studied for 1.85×106⩽Ra⩽1.04×1011. The best fit for the investigated range of Rayleigh numbers is found to be Nu=0.067Ra0.330 when a sidewall material of very low thermal conductivity is employed. The effect of sidewall conductance and aspect ratio on the Nu-Ra relationship is also scrutinized.
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