Three-dimensional numerical simulation of an array of impinging laminar square jets with spent fluid removal

Abstract

A three-dimensional numerical study is used to investigate the heat transfer characteristics of a 3 x 3 array of square jets with spent fluid removal through holes placed between nozzles on the confinement plate. The influence of the jet-to-jet spacing and nozzle to plate spacing is considered for different Reynolds numbers in the laminar range. For very small nozzle-to-plate distances (L-Z approximate to 0.25 D), spent fluid removal lowers the local Nusselt number in localities below the spent air holes as a result of detachment of the wall jets as the fluid is directed away from the impingement plate towards the spent air holes. Spent fluid removal increased the heat transfer rate for a larger nozzle to plate spacing of 2D for jet-to-jet spacings less than 4D. The effect of spent fluid removal is higher for smaller jet-to-jet spacings due to more intense jet interactions and cross flow effects. (C) 2003 Elsevier SAS. All rights reserved.