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contributor authorS. Acharya
contributor authorR. S. Bunker
contributor authorF. Zhou
contributor authorJ. Lagrone
contributor authorG. Mahmood
date accessioned2017-05-09T00:18:07Z
date available2017-05-09T00:18:07Z
date copyrightJuly, 2005
date issued2005
identifier issn0889-504X
identifier otherJOTUEI-28721#471_1.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/132784
description abstractThe heat transfer and pressure drop characteristics of latticework coolant blade passages have been investigated experimentally under conditions of rotation. Stationary studies with the latticework configuration have shown potential advantages including spatially-uniform streamwise distributions of the heat transfer coefficient, greater blade strength, and enhancement levels comparable to conventional rib turbulators. In the present study, a latticework coolant passage, with orthogonal-ribs, is studied in a rotating heat transfer test-rig for a range of Reynolds numbers (Res), Rotation numbers (Ros), and density ratios. Measurements indicate that for Res⩾20,000, the latticework coolant passage provides very uniform streamwise distributions of the Nusselt number (Nus) with enhancement levels (relative to smooth-channel values) in the range of 2.0–2.5. No significant dependence of Nus on Ros and density ratio is observed except at lower Res values (⩽10,000). Nusselt numbers are highest immediately downstream of a turn indicating that bend-effects play a major role in enhancing heat transfer. Friction factors are relatively insensitive to Ros, and thermal performance factors at higher Res values appear to be comparable to those obtained with conventional rib-turbulators. The present study indicates that latticework cooling geometry can provide comparable heat transfer enhancements and thermal performance factors as conventional rib-turbulators, with potential benefits of streamwise uniformity in the heat transfer coefficients and added blade strength.
publisherThe American Society of Mechanical Engineers (ASME)
titleLatticework (Vortex) Cooling Effectiveness: Rotating Channel Experiments
typeJournal Paper
journal volume127
journal issue3
journal titleJournal of Turbomachinery
identifier doi10.1115/1.1860381
journal fristpage471
journal lastpage478
identifier eissn1528-8900
keywordsRotation
keywordsCooling
keywordsChannels (Hydraulic engineering)
keywordsDensity
keywordsHeat transfer
keywordsVortices
keywordsReynolds number
keywordsFriction
keywordsFlow (Dynamics) AND Coolants
treeJournal of Turbomachinery:;2005:;volume( 127 ):;issue: 003
contenttypeFulltext


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