Numerical study on effect of nozzle size for jet impingement cooling with water-Al2O3 nanofluid

Abstract

A numerical model is developed using ANSYS Fluent software so as to study the effect of nozzle size for jet impingement cooling with water-Al2O3 nanofluid. The conservation equations of continuity, momentum and energy are solved to predict the heat transfer behaviors. Numerical simulations are performed with water-Al2O3 nanofluid jets for predicting temperature fields over the target plate by considering jet velocity of 60 m/s and nozzle to target plate distance of 5 mm along with four different nozzle diameters of 1, 2, 3 and 4 mm. As anticipated from each temperature field, temperature slowly increases from jet striking point on the target plate towards radially outward direction. It might be owing to carrying of heat by water-Al2O3 nanofluid in the stated direction. The trends of temperature variations along the radial direction for the stated four different cases are very similar. However, the maximum temperatures associated with the target plate for the cases with nozzle diameters of 1, 2, 3 and 4 mm are observed to be 320, 310, 307 and 308 K, respectively. Hence, nozzle diameter of 3 mm pertains to relatively lower maximum temperature of 307 K over the target plate. Thus, the stated case is the optimum one.