Nonlinear k―ε―f_μ model and its application to the flow and heat transfer in a channel having one undulant wall

摘要

Turbulent flows and related heat transfer over a fully developed wavy channel is investigated by a turbulence model. The nonlinear k―ε―f_μ model of Park et al. [Int. J. Heat Fluid Flow 24 (2003) 29] is slightly modified and their explicit heat flux model is employed. The Reynolds number is fixed at Re_b = 6760 through all wave amplitudes and the wave amplitude is varied in the range 0 ≤ a/λ≤ 0.15. The predicted results for wavy channel are validated by with comparing the DNS data of Maa? and Schumann [Flow Simulation with High Performance Computers, Notes on Numerical Fluid Mechanics 52 (1996) 227]. The model performance is shown to be generally satisfactory. By using k―ε―f_μ model, the enhancement of heat transfer and the characteristics of turbulent flow in wavy wall are investigated. Finally, the effects of wavy amplitude on separated shear layer and its consequent influence on heat transfer are scrutinized.