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Experimental Study on Heat Transfer Characteristics of Swirling Impinging Jet
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 Title & Authors
Experimental Study on Heat Transfer Characteristics of Swirling Impinging Jet
Jo, Jeong-Won; Lee, Sang-Jun;
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 Abstract
The heat transfer characteristics off swirling air jet impinging on a heated flat plate have been investigated experimentally. The main object is to enhance the heat transfer rate by increasing turbulence intensity of impinging jet with a specially designed swirl generator. The mean velocity and turbulent intensity profiles of swirling jet were measured using a hot-wire anemomety. The temperature distribution on the heated flat surface was measured with thermocouples. As a result the swirl effect on the local heat transfer rate on the impinging plate is confined mainly in the small nozzle-to-plate spacings such as L/D<3 at the stagnation region. For small nozzle-to-plate spacings, the local heat transfer in the stagnation region is enhanced from the increased turbulence intensity due to swirl motion, compared with the conventional axisymmetric impinging jet without swirl. For example, the local Nusselt number of swirling jet with swirl number Sw=0.75 and Sw=1 is about 9.7-76% higher than that of conventional impinging jet at the radial location of R/D=0.5. With the increase of the nozzle-to-plate distance, the stagnation heat transfer rate is decreased due to the diminishing axial momentum of the swirling jet. However, the swirling impinging jet for all nozzle-to-plate spacings tested in this study does not enhance the average heat transfer rate.
 Keywords
Heat Transfer;Swirling Impinging Jet;Swirl Number;Turbulent Intensity;
 Language
Korean
 Cited by
1.
삼각형 멀티 탭을 이용한 충돌제트 열전달 향상 연구,이정욱;이상준;

대한기계학회논문집B, 2004. vol.28. 10, pp.1139-1146 crossref(new window)
2.
노즐출구에 삽입된 다중관에 의한 충돌제트의 유동 및 열전달 특성,황상동;조형희;

대한기계학회논문집B, 2004. vol.28. 2, pp.135-145 crossref(new window)
3.
보텍스튜브를 이용한 충돌냉각의 실험적 연구,신운철;김창수;배신철;

대한기계학회논문집B, 2007. vol.31. 1, pp.8-15 crossref(new window)
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