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Title: Heat transfer characteristics of a slot jet impinging on a semi-circular convex surface
Authors: Chan, TL 
Leung, CW 
Jambunathan, K
Ashforth-Frost, S
Zhou, Y
Liu, MH
Keywords: Jet impingement heat transfer
Surface curvature
Liquid crystal thermographic technique
Transient heating liquid crystal method
Issue Date: 2002
Publisher: Pergamon Press
Source: International journal of heat and mass transfer, 2002, v. 45, no. 5, p. 993-1006 How to cite?
Journal: International journal of heat and mass transfer 
Abstract: Surface heat transfer characteristics of a heated slot jet impinging on a semi-circular convex surface have been investigated by using the transient heating liquid crystal technique. Free jet velocity, turbulence and temperature characteristics have been determined by using a combination of an X-wire and a cold wire anemometry. The parametric effects of jet Reynolds number (ReW) ranging from 5600 to 13,200 and the dimensionless slot nozzle-to-impingement surface distance (Y/W) ranges from 2 to 10 on the local circumferential heat transfer have been studied. Local circumferential Nusselt number (NuS) decreases with increasing the dimensionless circumferential distance (S/W) from its maximum value at the stagnation point up to S/W=3.1. The transition in the wall jet from laminar to turbulent flow was completed by about 3.3⩽S/W⩽4.2 which coincided with a secondary peak in heat transfer. Correlations of local and average Nusselt numbers with ReW, Y/W and S/W have been established for the stagnation point and the circumferential distribution. The rate of decay of average circumferential Nusselt numbers around the semi-circular convex surface is much faster than that which occurs laterally along the flat surface. As Y/W increases, the effect of surface curvature becomes apparent and the difference between the flat surface correlation and the convex surface becomes more pronounced.
ISSN: 0017-9310
EISSN: 1879-2189
DOI: 10.1016/S0017-9310(01)00217-4
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