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http://dx.doi.org/10.3795/KSME-B.2004.28.10.1139

Enhancement of Impinging Jet Heat Transfer Using Triangular Multi-Tabs  

Lee Jeong-Wook (포항공과대학교 대학원 기계공학과)
Lee Sang-Joon (포항공과대학교 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.28, no.10, 2004 , pp. 1139-1146 More about this Journal
Abstract
The effect of triangular tabs attached at the perimeter of jet nozzle on heat transfer enhancement was investigated experimentally. The modified flow structure was visualized using a smoke-wire method. Four different types of jet nozzle having 0, 4, 6 and 8 tabs were tested at jet Reynolds number Re=15,000 to investigate the effect of tabs on the variation of heat transfer rate. The local and average Nusselt numbers are increased with increasing the number of tabs. At nozzle-to-plate distance of L/D=4, the average Nusselt number was increased about 9.9% at Re=15,000 in the impingement region for the case of 8 tabs attachment. As the nozzle-to-plate distance increases, however, the heat transfer enhancement effect of triangular tabs is reduced. For the case of 4 tabs, the heat transfer enhancement is not so distinctive at L/D=8. As the protrusion depth of tabs into the jet flow increases, the heat transfer rate is also enhanced when the nozzle-to-plate distance is smaller than L/D=6.
Keywords
Impinging Jet; Heat Transfer Control; Tab;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
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