Thermal Boundary Layer Control in High Rayleigh Number Natural Convection by Impinging Flow

Abstract

In this study, a method is proposed to enhance heat transfer in a wide range of Rayleigh numbers by impinging a low flow rate planer jet onto the low Rayleigh number natural convection region. The control of the thermal boundary layer in the high Rayleigh number natural convection region is demonstrated. To evaluate the heat transfer enhancement by the impinging jet, a numerical simulation and optical measurements of the temperature field were conducted. The analysis and measurements found that the heat transfer in both the low and high Rayleigh number natural convection regions was enhanced when the jet with a range of specific Reynolds number impinges on the low Rayleigh number natural convection region.