Numerical study of reynolds number effect in fluid jet impingement cooling heat transfer on concave surface

Generally jet impingement is a technology of providing a medium for heat transfer on surface that is to be cooled by impinging fluid on it. This method of cooling has high heat transfer capability. This technology is applied in micro-electronic industries, gas turbine cooling, quenching process in chemical plant and so forth. Most research has been done on jet impingement, mainly on the effects of Reynolds number, Nusselt number, nozzle geometry of jet, distance nozzle to target surface and other parameters that could affect the heat transfer rate. However, most of this research are done on flat surface, the knowledge regarding this technology on cylindrical surface are no abundant let it be concave or convex. Thus, to increase the viability of this technology on various application and increase industrial process efficiency that relies on rapid cooling on cylindrical surfaces, this study will be carry out. The scope of this study will be on evaluating the effects of Reynolds number on the cooling process heat transfer rate on concave surface. The Re= 5000, 10000, 15000, 20000, 25000 and 30000 will be used. The value of Nusselt number will be evaluated to determine the heat transfer strength. To carry out this study we will use the aid of simulation software. CFD ANSYS FLUENT will be used to simulate the jet impingement system by using standard equation of motion and the Navier-Stokes standard k-£ equation model is used. The working fluid would be air. The results obtained are Nu = 28.74, 44.67, 56.82, 67.30, 76.58 and 84.9 with respective to the increment of Reynolds number. In conclusion it can be said that with higher Reynolds number, Nusselt number will increase which as well indicates high heat transfer.