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

A numerical analysis for fluid flow and heat transfer of a confined slot jet impingement with an extended nozzle is performed. The parametric effects of jet Reynolds number, spacing between the confinement plate and the target surface, and nozzle length on local flow development and heat transfer characteristics of the heated target surface are explored. The viscous boundary-layer thickness at the stagnation line is presented. It may be well predicted by the correlation of a two-dimensional stagnation flow if the lateral velocity gradient just outside the viscous boundary layer is known. This lateral velocity gradient is linearly proportional to jet Reynolds number, while inversely proportional to the ratio of nozzle exit-to-target surface distance to nozzle width 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 theoretical results.