✦ LIBER ✦

Local characteristics of impingement heat transfer with oblique round free-surface jets of large Prandtl number liquid

✍ Scribed by C.F. Ma; Q. Zheng; H. Sun; K. Wu; T. Gomi; B.W. Webb

Publisher: Elsevier Science
Year: 1997
Tongue: English
Weight: 786 KB
Volume: 40
Category: Article
ISSN: 0017-9310
DOI: 10.1016/s0017-9310(96)00310-9

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✦ Synopsis

An experimental study was performed to investigate the local convective heat transfer from a vertical heated surface to an obliquely impinging circular free-surface jet of transformer oil. The effect of jet inclination was examined in the range of Reynolds number between 235 and 1745 with jet angle from 90 to 45 dog. Maximum heat transfer coefficient was found to decrease with the increasing of jet inclination, while its location shifted to the upstream side. Correlations were developed to predict the variations of the magnitude and the location of the peak heat transfer. Profiles of local Nusselt number were measured both in x and y-axes. The profiles along x-axis displayed an increasing asymmetry with increasing jet inclination. An empirical correlation was presented for predicting the x-axis profiles. With y-axis profiles, a symmetry appeared in,;ide the stagnation zone, but a gravity-induced asymmetry was observed outside that zone.

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