The cooling capacity of natural gases for circular/rectangular geometries by impinging jet

In this work, influences of the variety of parameters on the heat transfer forced convection of two confined impinging jets such as inlet geometry and mass flow rate have been investigated numerically. Simulations were done by using 3D k-ε model for incompressible flow on two jet exit geometries comprising rectangular and circular jets at dimensionless jet to plate distance of 2. Equations were discretized by a finite volume method. Local Nusselt number was obtained for various mass flow rate and geometries for air and pure gases of oxygen, nitrogen, Argon and carbon dioxide at dimensionless jet to plate distance of 2. As the mass flow rate increases, heat transfer enhancement was obtained. The CO2 gas has the highest level of the Nusselt number in comparison with others and around 40 percent increases the rate of heat transfer compare to the air thus it could be very useful in cooling process rather than other gases. Also this study revealed that the forced convection heat transfer in the circular jet has the higher amount than the rectangular jet.