Abstract
An experimental investigation was made of the temperature distribution in a heated horizontal layer of high Prandtl number (6 and 18) silicone fluids confined between rigid, parallel, conducting plates. The experiments covered a range of Rayleigh numbers from 7.39 × 10 5 to 3.21 × 10 8. The time mean temperature close to the upper and lower boundaries could not be represented by a power law dependence on distance from the boundary. The temperature fluctuations were found to have a characteristic period, as predicted by Chang and Howard. Heat-transfer measurements were in agreement with previous measurements. The distribution of the root mean square temperature fluctuations did not verify any of the proposed theories. The nature of the heat transport processes in the liquid was also studied and the results were compared with other experimental measurements made by Townsend. Croft and Deardorff, and Willis.
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