FLUID-FLOW AND HEAT-TRANSFER OF AN EXTENDED SLOT JET IMPINGEMENT

A numerical analysis for fluid flow and heat transfer of a confined sl ot jet impingement with an extended nozzle is performed. The parametri c effects of jet Reynolds number, spacing between the confinement plat e and the target surface, and nozzle length on local flow development and heat transfer characteristics of the heated target surface are exp lored. The viscous boundary-layer thickness at the stagnation line is presented. It may be well predicted by the correlation of a two-dimens ional stagnation flow if the lateral velocity gradient just outside th e viscous boundary layer is known. This lateral velocity gradient is l inearly proportional to jet Reynolds number, while inversely proportio nal to the ratio of nozzle exit-to-target surface distance to nozzle w idth in a 0.34 power. In addition, new correlations for stagnation and local Nusselt numbers along the heated target surface are reported in this article. These correlations give satisfactory agreements with th eoretical results.