Comparative Study of Turbulent Heat Transfer in Plane Wall Jet Using Different k-ε RANS Models

The turbulent mechanism of heat transfer from an isothermal flat surface by a wall jet has been numerically investigated using three varieties of k-ε models such as Realizable, RNG and Standard k-ε models. Enhanced Wall Treatment (EWT) has been implemented with all of them as near wall treatments to capture the near wall more accurately. The primary objective of this work is to find the best performing model among these three which predicts the thermal behavior of wall jet with highest accuracy. Commercial CFD package ANSYS-Fluent solver has been used to perform the numerical simulation under a fixed jet exit Reynolds number of 9600. This study reveals that the Realizable k-ε model has the better potential to predict the near wall thermal characteristics of wall jet in terms of heat transfer coefficient, turbulent heat flux and near wall temperature distribution with reasonable accuracy than the others, if the near wall mesh elements are properly structured.