Experimental Investigations on Influences of Nozzle Size and Jet Reynolds Number on Cooling Characteristics of Impinging Water Jets

Abstract

The present study involves the experimental investigations of the heat transfer characteristics of axisymmetric water jet impingement on a heated plate. Various parameters affecting the thermal performance of axisymmetric water jet are identified and their effects on heat transfer behavior are also studied. The key parameters considered are jet Reynolds number (800-3200) and nozzle diameter (3-6 mm). In addition, all the investigations here are restricted to a constant heat flux condition. Results indicate that the water jet performance can be optimized with respect to these influencing parameters. However, with the present experimental conditions the nozzle diameter of 5 mm together with the jet Reynolds number of 2400 gives moderate heat transfer behavior and is the optimum one.