화학공학소재연구정보센터
International Journal of Heat and Mass Transfer, Vol.44, No.4, 691-698, 2001
A near-wall two-equation heat transfer model for wall turbulent flows
A proposed near-wall (t(2)) over bar-epsilon (t) two-equation model for turbulent heat transport reproduces the correct near-wall behavior of temperature under various wall thermal boundary conditions. In this model, a mixing timescale is introduced to model the production term of epsilon (t) equation, and a more convenient boundary condition for epsilon (t) under the uniform wall heat flux is suggested. The present model is tasted through application to turbulent heat transfer for channel flow. Predicted results are compared with direct numerical simulation (DNS) data. The near-wall (t(2)) over bar-epsilon (t) two-equation model predicts reasonably well the distributions of the time-mean temperature. normal turbulent heat flux, temperature variance, dissipation rate and their near-wall budgets. (C) 2001 Elsevier Science Ltd. All rights reserved.