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An Experimental Study on Heat Transfer Characteristics of Arrangement Chips by Swirl Jet Impingement  

최재욱 (영남대학교 대학원 기계공학과)
전영우 (영남대학교 대학원 기계공학)
정인기 (영남대학교 기계공학)
박시우 (경일대학교 기계자동차학부)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.28, no.4, 2004 , pp. 624-631 More about this Journal
Abstract
The experimental study on heat transfer characteristics of protruding heated block array as conducted to investigate and to compare the performance of impinging single circular jet in fully developed tube with a twisted tape as a swirl generator. The effects of jet Reynolds number(Re=8700, 13800, 20000. 26500), dimensionless jet-to-block distance(H/d=1. 3, 5. 7) and swirl number(S=0.11, 0.23, 0.30) of the swirl jet on the average Nusselt number for each block and all blocks have been examined. Measurements of heat transfer rate on block surfaces were used naphthalene sublimation technique. Mean velocity and turbulence intensity of the jet along the axis were measured. Potential core length of the jet was 5 times of nozzle diameter because it was fully developed and initially turbulent. With the twisted tape in the nozzle, heat transfer coefficients were higher than those without the twisted tape. which are mainly caused with increasing the jet Reynolds number and swirl number.
Keywords
Arrangement Chip; Twisted Tape; Swirl Jet Impingement Heat Transfer; Naphthalene Sublimation Technique;
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