Convective heat transfer enhancement from a small rectangular channel by a cross-flow Jet: A CFD study

摘要

Heat transfer from an isothermal heated flat surface due to a turbulent jet, impinging normal to a main flow is studied numerically in a three-dimensional computational domain. Conservation equations for mass, momentum, and energy are solved using finite volume method with a standard kappa-omega turbulence model. The duct and nozzle Reynolds numbers are varied from 8,960 to 62,717 and 5,162 to 15,785, respectively. Three different axial positions of the nozzle have been considered to choose the best location of the nozzle for the maximum heat transfer enhancement. At duct Reynolds number of 8,960, it is observed that the average Nusselt number is increased by 35.64% as the nozzle is shifted from position 3 to 1. Moreover, the average Nusselt number is found to be a strong function of both duct as well as nozzle Reynolds number. At a particular nozzle Reynolds number, the pumping power is observed to increase with the duct Reynolds number.