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contributor authorForrest, Eric C.
contributor authorHu, Lin
contributor authorBuongiorno, Jacopo
contributor authorMcKrell, Thomas J.
date accessioned2017-05-09T01:30:02Z
date available2017-05-09T01:30:02Z
date issued2016
identifier issn0022-1481
identifier otherht_138_02_021704.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/161505
description abstractExperimental results are presented for singlephase heat transfer in a narrow rectangular minichannel heated on one side. The aspect ratio and gap thickness of the test channel were 29:1 and 1.96 mm, respectively. Friction pressure drop and Nusselt numbers are reported for the transition and fully turbulent flow regimes, with Prandtl numbers ranging from 2.2 to 5.4. Turbulent friction pressure drop for the high aspect ratio channel is wellcorrelated by the Blasius solution when a modified Reynolds number, based upon a laminar equivalent diameter, is utilized. The critical Reynolds number for the channel falls between 3500 and 4000, with Nusselt numbers in the transition regime being reasonably predicted by Gnielinski's correlation. The dependence of the heat transfer coefficient on the Prandtl number is larger than that predicted by circular tube correlations, and is likely a result of the asymmetric heating. The problem of asymmetric heating condition is approached theoretically using a boundary layer analysis with a tworegion wall layer model, similar to that originally proposed by Prandtl. The analysis clarifies the influence of asymmetric heating on the Nusselt number and correctly predicts the experimentally observed trend with Prandtl number. A semianalytic correlation is derived from the analysis that accounts for the effect of aspect ratio and asymmetric heating, and is shown to predict the experimental results of this study with a mean absolute error (MAE) of less than 5% for 4000 < Re < 70,000.
publisherThe American Society of Mechanical Engineers (ASME)
titleConvective Heat Transfer in a High Aspect Ratio Minichannel Heated on One Side
typeJournal Paper
journal volume138
journal issue2
journal titleJournal of Heat Transfer
identifier doi10.1115/1.4031646
journal fristpage21704
journal lastpage21704
identifier eissn1528-8943
treeJournal of Heat Transfer:;2016:;volume( 138 ):;issue: 002
contenttypeFulltext


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