Nonlinear flow and heat transfer dynamics of a slot jet impinging on a slightly curved concave surface

Abstract

The nonlinear flow and heat transfer characteristics for a slotjet impinging on a slightly curved concave surface are experimentally studied here. The effects of jet Reynolds number on the jet velocity distribution and circumferential Nusselt numbers are examined. The nozzle geometry is a rectangular slot and the dimensionless nozzle-to-surface distance equals to L* = 8. The constant heat fluxes are accordingly applied to the surface to obtain an impingement cooling by the air jet at ambient temperature. The measurements are made for the jet Reynolds numbers of 8617, 13350 and 15415. New correlations for local, stagnation point, and average Nusselt numbers as a function of jet Reynolds number and dimensionless circumferential distance are reported. (c) 2005 Elsevier Ltd. All rights reserved.