Jet-impingement heat transfer in rotating channels with staggered extraction flow
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The effect of orthogonal channel rotation on jet-impingement cooling by arrays of circular jets in two channels was studied. Impinging jet flows on smooth target walls were in the direction of rotation in one channel and opposite to the direction of rotation in the other channel. Spent air exited the channels through extraction holes, staggered with respect to the impinging jets, in each target wall, which eliminates crossflow on other jets. Experimental heat-transfer results for these target walls, for the jet walls containing the jet-producing orifices, and for the connecting sidewalls show that as the jet rotation number increases to 0.0028 these wall Nusselt numbers decrease to 35, 25, and 30%, respectively, below their corresponding nonrotating values. Jet rotation number is a correlating parameter, and as wall-to-jet temperature difference ratio increases to 0.129 the wall Nusselt numbers vary up to 10%. Comparisons are made with previous rotating results for target wall heating only and for the radially outward crossflow exit configuration. Copyright 2003 by James A. Parsons and Je-Chin Han.
