Convective Heat Transfer Enhancement of a Rectangular Flat Plate by an Impinging Jet in Cross Flow

• Published in: Chinese journal of chemical engineering Vol. 22; no. 5; pp. 489 - 495
• Main Author: 李国能 郑友取 胡桂林 张治国
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2014
• Subjects: Chemical engineering; convection heat transfer; Cross flow; Flat plates; Fluid dynamics; Fluid flow; Heat transfer; heat transfer enhancement; impinging jet; Mass ratios; Reynolds number; 传热性能; 促进因子; 冲击射流; 对流; 换热强化; 横流; 热传递过程; 矩形平板; cross flow; impinging jet; convection heat transfer; heat transfer enhancement
• ISSN: 1004-9541; 2210-321X
• DOI: 10.1016/S1004-9541(14)60060-4

Experiments were carried out to study the heat transfer performance of an impinging jet in a cross flow. Several parameters including the jet-to-cross-flow mass ratio （X=2%-8%）, the Reynolds number （Red=1434-5735） and the jet diameter （d=2-4 mm） were explored. The heat transfer enhancement factor was found to increase with the jet-to-cross-flow mass ratio and the Reynolds number, but decrease with the jet diameter when other parameters maintain fixed. The presence of a cross flow was observed to degrade the heat transfer performance in respect to the effect of impinging jet to the target surface only. In addition, an impinging jet was confirmed to be capable of en-hancing the heat transfer process in considerable amplitude even though the jet was not designed to impinge on the target surface.