Numerical Investigation of Orifice Shape Effect on the Flow Behavior of the Jet-Cavity Interaction

Abstract

The aim of the present work is to analyze the effect of orifice shape on wall jet development to enhance the impingement heat transfer in confined cavity with the validated model of hot and cold jet using computing code ANSYS.CFX. Circular, elliptic, square and rectangular are the investigated orifice shapes, that they have the same hydraulic diameter Dh = 0.12m. Another objective of this paper is to investigate the influence of Reynolds number based on the mean jet splay and diffuser hydraulic diameter. The validation of results shows qualitatively good agreement and almost all flow structures are well reproduced by the computation. The results show that the orifice shape affects the flow and the heat transfer coefficient in the cavity. The elliptical shape gives an accelerated flow, which provides better heat transfer enhancement of 7% than that the circular diffuser.