Numerical investigation of conjugate heat transfer on a rotating disk under round liquid jet impingement

Abstract

The two-phase flow and heat transfer characteristics of a free liquid jet impinging on a heated rotating disk are investigated by the CFD method. Numerical simulations are conducted over a range of rotational Reynolds numbers, jet Reynolds numbers, jet temperatures, nozzle diameter to disk spacing ratios, and disk to nozzle diameter ratios. The results show that the local Nusselt number increases first and then decreases along the radial direction, and it reaches the peak value in the core heat transfer zone close to the rotation center. The Nusselt number of the disk surface increases with the increase of rotational Reynolds number, jet Reynolds number, jet temperature, and nozzle diameter to disk spacing ratio, and the temperature distribution of the disk surface becomes more uniform. The increase of the disk to nozzle diameter ratio is not conducive to convective heat transfer. The temperature at the disk edge rises with the larger diameter ratio. Based on the numerical simulation results, a new correlation for the average Nusselt number is presented in terms of the dimensionless variables of jet Reynolds number, rotational Reynolds number, and Prandtl number in this study.