Numerical Study on Heat Transfer of an Impinging Turbulent Plane Jet with Confined Wall.

Abstract

The present paper describes the numerical results of the fluid flow and heat-transfer characteristics of the impinging turbulent plane jet with the confined wall. Numerical results were obtained in the range of the nondimensional height from H=1.0 to 3.0. The Reynolds number based on the nozzle diameter and mean velocity was set to 8000. According to the experimental results, it had been shown that two peaks of the distribution of local heat-transfer coefficient exist along the impingement wall. To the best of our knowledge, no numerical solution has been obtained for the heat-transfer characteristics of the impinging jet in a very narrow channel. We applied a low Reynolds number version of the anisontropic k-e model of turbulence, i.e., the Myong-Kasagi model, and a WET model for the turbulent heat fluxes to simulate this turbulent impinging flow and heat transfer. The simulation results were in a very good agreement with the experimental one. We could predict the secondary peak of the local heat-transfer distribution on the impingement wall. The reason why the secondary peak appeared was determined. We pointed out that both treatments of low Reynolds number modeling and this anisotropic k-e model of turbulence were very important for this very strong anisotropic turbulent shear flow.