Abstract
Impinging jets have been used in a wide range of applications such as heating, cooling and drying due to its ability to enhance heat transfer. In this study, heat transfer characteristics of a heated plate in a cooling process with an impinging slot air jet are investigated numerically. Conservation equations are solved with ANSYS-FLOTRAN Galerkin Finite Element Code by assuming steady, turbulent, 2D, incompressible flow. Obtained results by using the std. k–e, RNG k–e, k–ω and SST turbulent models are compared with experimental results and better results are obtained with SST model. Then, the effects of jet-to-target distance and Re number, turbulence intensity, thermophysical property variation with buoyancy, and different heat flux values on the heat transfer are analyzed by using SST model. Computations are performed in the Reynolds number range of 4000 ≤ Re ≤ 12000 and the jet-to-target distance range of 4 ≤ z / Dh ≤ 12. Results showed that the local Nusselt number increases with increasing Reynolds number and decreasing z/Dh values. Also, stagnation region heat transfer is increased with increasing turbulence intensity.
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