期刊
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
卷 56, 期 -, 页码 12-18出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ijthermalsci.2012.01.007
关键词
Biot number; Cold spraying; Jet impingement; Nusselt number; Temperature distribution
In this study, the Nusselt numbers of impinging compressible fluid jets originating from a cold-gas dynamic spraying nozzle were determined. A low-pressure cold-gas dynamic spraying unit was used to generate a jet of hot compressed nitrogen that impinged upon flat substrates. Computer codes based on a finite differences method were used to solve the governing 3-D temperature distribution equation for the substrate to produce a non-dimensional relationship between the Nusselt number and the radius of the impinging fluid jet. It was found that the Nusselt number decreased as the non-dimensional radius of the jet from the stagnation point increased. It was found further that for small values of the Biot number, a simplified 2-D approximation of the substrate temperature distribution produced substrate surface temperature profiles that were in close agreement with that determined from the more complex 3-D temperature distribution model. (C) 2012 Elsevier Masson SAS. All rights reserved.
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