CFD Analysis of a Heat Exchanger using Enhanced Wall Treatment Function to Capture the Laminar Sub-Layer Close to the Wall

Present work reports on analysis of effect of wall functions in a STHE on surface heat transfer. The inlet temperature of hot fluid, which is flowing in a pipe, is maintained at 333Kand inlet of cold fluid, flowing in shell is maintained at of 300K. The tube wall is conductive medium and is made of stainless steel, where shell tube is considered as a pure insulator. Water is considered as working fluid for this study. HTC of wall is considered as the variable of interest to analyze enhanced wall function and K-e standard wall function. Using enhanced wall treatment function, the velocity distribution and the temperature distribution near the wall regions for laminar sub layer are captured clearly, which is otherwise not possible with the standard wall function.