Investigation of Turbulent Heat Flux Modeling in Slot Jet Impingement Cooling

The present paper discusses the importance of turbulent heat flux modeling in predicting an impinging flow. Generalized gradient diffusion hypothesis (GGDH) and a higher order version of GGDH (HOGGDH) are employed for the simulation of turbulent heat flux in impingement heat transfer. The flow field is modeled with the low Reynolds second moment closure turbulence model. Combination of the low Reynolds second moment closure and HOGGDH models can reasonably predict the local Nusselt number in comparison with the available experimental data. Results show that the HOGGDH over-predicts the turbulent heat transfer and the local Nusselt number particularly in the impingement zone. This is due to the extreme dependence of this model on the velocity gradients and Reynolds stresses. Applying the HOGGDH model does not affect the tendency of the predicted local Nusselt number.

کلیدواژه ها:

Impingement Cooling ، Turbulent Heat Flux ، Low Reynolds Second Moment Closure