Effect of Strip-Fin Height on Jet Impingement Heat Transfer in a Rectangular Channel With Two Jet-to-Target Surface Spacings
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AbstractAn experimental investigation of heat transfer performance in a rectangular impingement channel featuring staggered strip-fins was completed. Four configurations were considered to study the effects of varying the strip-fin height (H/d = 1.5 and 2.75) at two jet-to-target surface spacings (z/d = 3 and 6) on the heat transfer, pressure loss, and crossflow magnitude for an impingement channel with in-line, 4 12 impinging jets. Also, the effect of the reference temperature choice, either jet inlet temperature or local bulk temperature, for calculating the local heat transfer coefficients was considered. The regionally averaged heat transfer coefficients were measured at seven Reynolds numbers, based on the jet diameter, (10k-70k) utilizing the copper plate experimental method. The results show that the trend of the local Nusselt number distribution varies along the streamwise direction due to the crossflow effect. The crossflow is similar for all Reynolds numbers at a given jet-to-target surface spacing. The discharge coefficients start to decrease below 0.9 after Re = 50k. Finally, empirical correlations were expressed for the area averaged Nusselt number estimation of impingement channels with pin-fin or strip-fin roughness elements.
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Volume 7B: Heat Transfer General Interest/Additive Manufacturing Impacts on Heat Transfer; Internal Air Systems; Internal Cooling
