Abstract :Impinging jets have received considerable attention during the last decade. The reason is mainly due to
their inherent characteristics of high rates of heat transfer besides having simple geometry. Thus most
practical applications of jet impingement occur in industries where the heat transfer requirements have
exceeded capacity of ordinary heating and cooling techniques. In this paper heat transfer and fluid flow
due to the impingement of vertical circular single jet on a horizontal heated surface is investigated
experimentally. The flow is turbulent and a uniform temperature is applied on the target surface. Different
particle volume fractions, jet flow rates, jet nozzle diameters, Reynolds number and various geometric
ratios have been considered in order to study the behavior of the system in terms of local Nusselt number
and convective heat transfer coefficient. The experimental results indicate that using nanofluid as a heat
transfer carrier can enhance the heat transfer process. It is found that the local heat transfer coefficient
express Nusselt number as a function of nozzle exit Reynolds number and also nozzle to plate spacing and
of the radial displacement from the stagnation point.