CFD PREDICTION FOR MULTI-JET IMPINGEMENT HEAT TRANSFER

In this paper, the flow and heat transfer characteristics of two lines of staggered or inline round jets impinging on a flat plate are numerically analyzed using the CFD commercial code FLUENT. Firstly, the relative performance of seven versions of turbulence models, including the standard k - epsilon model, the renormalization group k - epsilon model, the realizable k - epsilon model, the standard k - omega model, the Shear-Stress Transport k - omega model, the Reynolds stress model and the Large Eddy Simulation model, for numerically predicting single jet impingement heat transfer is investigated by comparing the numerical results with available benchmark experimental data. As a result, the Shear-Stress Transport k - omega model is recommended as the best compromise between the computational cost and accuracy. Using the Shear-Stress Transport k - omega model, the impingement flow and heat transfer under multi-jets with different jet distributions and attack angles are simulated and studied. The effect of hole distribution and angle of attack, etc. on the heat transfer coefficient of the target plate are examined.