High Prandtl number effect on Rayleigh-Benard convection heat transfer at high Rayleigh number

摘要

This paper represents results of the Rayleigh-Benard convection heat transfer in silicon oil confined by two horizontal plates, heated from below, and cooled from above. The Prandtl numbers considered as 100-10,000 corresponding to three types of silicon oil. The experiments covered a range of Rayleigh numbers from 2.14·10~9 to 2.27·10~(13). The data points that the Nusselt number dependents on the Rayleigh number, which is asymptotic to a 0.248 power. Furthermore, the experiment results can fit the data in low Rayleigh number well.