Application of a surface renewal model to the prediction of heat transfer in an impinging jet

Abstract

The concept of surface renewal is applied to an impinging heated planar jet to predict the local heat transfer coefficient distribution near impingement. The modeling concept is based on a zonal approach which identifies an outer flow and an impingement region. The outer region flow is determined by using the standard κ-ε model. The impingement region is modeled using the surface renewal concept. In the application of the surface renewal model the solution is sensitive to the zonal matching and initial conditions imposed. Results show very good agreement with experimental data when the jet centerline conditions are used to scale the initial velocity and temperature renewal process. The renewal frequency for momentum is derived from experimental data. The thermal energy renewal is modeled based on a renewal frequency developed from the consideration of a displaced temperature spectrum which is consistent with experimental results. Overall, the use of the surface renewal model in the impingement region is shown to be an attractive alternative approach in the prediction of the surface interactions.