Experimental investigations on impacts of nozzle diameter on heat transfer behaviors with water jet impingement

Abstract

Rigorous experiments are done to study the impacts of nozzle size on heat spreading over flat plate exposed to uniform heat flux of 6.25 W.cm-2. In lieu of that four nozzle diameters of 3, 4, 5 and 6 mm are chosen, besides, jet flow rate and Reynolds number of 30 lph and 2400, respectively. As expected, it is observed that the temperature increases in radial direction. Furthermore, the observed temperature distribution is axisymmetric. Additionally, it also reveals that the temperature increases with nozzle diameter. Besides, the observed temperature variation is almost linear. Likewise, it also shows that the Nusselt number decreases in radial direction. The observed Nusselt number distribution is axisymmetric as well. In addition, it also reveals that the Nusselt number decreases with nozzle diameter. The observed Nusselt number variation is almost linear on top. Nevertheless, the nozzle diameter of 5 mm offers average and optimum cooling characteristics.