NUMERICAL STUDY ON H EAT TRANSFER OF TURB ULENT DUCT FLOW THROUGH RIBBED DUCT

Ribs have been used as a tool to enhance heat transfer by inc reasing the level of turbulence mixing in the flow. Enhancing heat transfer surface are used in many engineering applications such as gas turbine blade cooling passages (i.e. channel/duct), air heater, heat exchanger surfaces, gas - cooled reactor fuel eleme nts, ventilation equipment of micro - electronic systems and air conditioning/ refrigeration systems, hence many techniques have been investigated on enhancement of heat transfer rate and decrease the size and cost of the involving equipment especially in he at exchangers. Rib roughness on the underside of the top wall of a duct has been found to substantially enhance the heat transfer coefficient. A two - dimensional CFD investigation is conducted to study forced convection of fully developed turbulent flow in a rectangular duct having ribs on the underside of the top wall. CFD solutions are obtained using commercial software ANSYS FLUENT v12.1. The wor king fluid in all cases is air