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contributor authorNawaf Y. Alkhamis
contributor authorAkhilesh P. Rallabandi
contributor authorJe-Chin Han
date accessioned2017-05-09T00:44:49Z
date available2017-05-09T00:44:49Z
date copyrightNovember, 2011
date issued2011
identifier issn0022-1481
identifier otherJHTRAO-27926#111901_1.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/146560
description abstractHeat transfer coefficients and friction factors are measured in a 45 deg V-shaped rib roughened square duct at high Reynolds numbers, pertaining to internal passages of land-based gas turbine engines. Reynolds numbers in this study range from 30,000 to 400,000, which is much higher than prior studies of V-shaped rib roughened channels. The dimensions of the channel are selected to ensure that the flow is in the incompressible regime. Blockage ratio e/D ranges from 0.1 to 0.18 and the spacing ratio P/e ranges from 5 to 10. Reported heat transfer coefficients are regionally averaged, measured by isothermal copper plates. Results show that the heat transfer enhancement decreases with increasing Reynolds number. The friction factor is found to be independent of the Reynolds number. The thermal performance decreases when the Reynolds number increases. 45 deg V-shaped ribs show a higher thermal performance than corresponding 45 deg angled ribs, consistent with the trend established in literature. Correlations for the Nusselt number and the friction factor as function of Re, e/D, and P/e are developed. Also developed are correlations for R and G (friction and heat transfer roughness functions, respectively) as a function of the roughness Reynolds number (e+ ).
publisherThe American Society of Mechanical Engineers (ASME)
titleHeat Transfer and Pressure Drop Correlations for Square Channels With V-Shaped Ribs at High Reynolds Numbers
typeJournal Paper
journal volume133
journal issue11
journal titleJournal of Heat Transfer
identifier doi10.1115/1.4004207
journal fristpage111901
identifier eissn1528-8943
keywordsFriction
keywordsHeat transfer
keywordsChannels (Hydraulic engineering)
keywordsReynolds number
keywordsHeat transfer coefficients
keywordsFlow (Dynamics) AND Surface roughness
treeJournal of Heat Transfer:;2011:;volume( 133 ):;issue: 011
contenttypeFulltext


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