Heat transfer analysis of slot jet impingement using Nano fluid on convex surface

Abstract

Numerical simulation is performed for investigating the heat transfer performance using nanofluids in a confined slot jet impingement on a convex surface. The impinging jet is water - alumina nanofluids (40 nm average particle size). The aim of this numerical study is to evaluate the augmentation of heat transfer with suspended nanoparticles (in this case Al2O3 - water) using temperature independent nanofluids properties. Different parameters such as various Reynolds numbers, distance between jet to target plate have been considered to investigate the flow behaviour and convective heat transfer performance of the system. Results in the form of distribution of average Nusselt number and convective heat transfer coefficients at the curved surface are shown to elucidate the heat transfer and flow behaviour process. In addition, qualitative analysis of both stream function and isotherm contours is carried out to perceive the flow pattern and heat transfer mechanism due to addition of nanofluids. The results reveal that average Nusselt number and heat transfer coefficient significantly rises with rise in jet inlet Reynolds number. It is also proved that heat transfer is augmented when nano particles are added to a base fluid.