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http://dx.doi.org/10.3795/KSME-B.2006.30.7.656

A Study on the Heat Transfer Characteristics of Turbulent Round Jet Impinge on the Inclined Concave Surface Using Transient Liquid Crystal Method  

Lim Kyoung-Bin (한밭대학교 기계공학과)
Lee Chang-Hee (한양대학교 기계공학과)
Lee Sang-Hoon (한밭대학교 대학원 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.30, no.7, 2006 , pp. 656-662 More about this Journal
Abstract
The effects of concave hemispherical surface with inclined angle on the local heat transfer from a turbulent round jet impinging were experimentally investigated using transient liquid crystal method. This method suddenly exposes a preheated wall to an impinging jet and then the video system records the response of liquid crystals for the measurement of the surface temperature. The Reynolds numbers were used 11000, 23000 and 50000, nozzle-to-surface distance ratio from 2 to 10 and the surface angles $\alpha=0^{\circ},\;15^{\circ},\;30^{\circ}\;and\;40^{\circ}$. Correlations of the stagnation point Nusselt number according to Reynolds number, jet-to-surface distance ratio and dimensionless surface angle are investigated. In the stagnation point, in term of $Re^n$, n ranges from 0.43 in case of $2{\leq}L/d\leq6$ to 0.45 in case of $6
Keywords
Transient Liquid Crystal Method; Impingement Jet; Nusselt Number of Stagnation Point; Concave Surface;
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Times Cited By KSCI : 2  (Citation Analysis)
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