Numerical study on flow and heat transfer of variable span micropolar impinging jet

In the present study flow behavior and heat transfer of varied wide slight jet impingement with time for micro polar fluid are investigated. The effects of micro polar flowcharacteristics such as micro-rotation (G), the coeflicient ratio of vortex viscosity to slmr viscosity (K), Reynolds number, the frequency of the jet oscillation, and the periodic variation of jet spans on the flow pattern, tetnperature distribution and heat transfer are ntnnerically studied. ht order to modeling the unsteady jet impingement in micro polar fluid flow, a computational progarn is written in FORTRAN based on explicit projection finite difference method. The numerical results show for certain inlet velocity inmicro polar fluid flow microchannl with applied periodic change of jet span, the moving vortices is created which significantly improve the heat transfer ratio. In the examined cases, the flow of micro polar fluids with a frequency of 0.25 and with a coefficient ratio of vortex viscosity to shear viscosity of 8, the maximum Nusselt number fluctuates over the duration of time.

Keywords:

impinging _iet , micro polar fluid , heat transfer , oscillatingjet