化工学报2011，Vol.62Issue(5)：1275-1281,7.DOI:10.3969/j.issn.0438-1157.2011.05.015
圆形自由水射流冲击换热及喷嘴布置
Free surface circular water jet impingement heat transfer and nozzle arrangement
柳翠翠 1姜泽毅 1张欣欣 1张成 1马强2
作者信息
- 1. 北京科技大学机械工程学院,北京100083
- 2. 中国航空规划建设发展有限公司,北京102206
- 折叠
摘要
Abstract
Mathematical models for flow and heat transfer combined with theoretical analysis and numerical solution are developed to predict the free surface water jet impingement heat transfer for design of water jet cooling equipment with large axles. The stagnation region, boundary layer region and similarity region are numerically solved separately by differential method. Heat transfer characteristics are obtained and validated by comparison with experimental data. Effects and contributions of key parameters on the free surface water jet heat transfer are analyzed and the arrangement for nozzles is discussed. The results show that the Reynolds number based on the nozzle diameter is a dominant parameter in local Nu-r/d distribution. The area-averaged Nusselt number increases with nozzle diameter at a constant Re and the same impinging areas, and with nozzle flow rate. At a constant flow rate, Re and nozzle diameter exhibit comparable heat transfer capacities in small impinging areas, while the combination of larger nozzle diameter and smaller Re presents a better heat transfer effect in larger impinging areas. The area-averaged Nu has a small decrease with the aspect ratio decreasing from 1: 1 to 1: 4. The staggered arrangement for nozzles is better than in-line arrangement for uniform heat transfer though the area-averaged Nu values are nearly the same.关键词
冲击射流/冷却/喷嘴布置Key words
jet impingement/ cooling/ nozzles arrangement分类
能源科技引用本文复制引用
柳翠翠,姜泽毅,张欣欣,张成,马强..圆形自由水射流冲击换热及喷嘴布置[J].化工学报,2011,62(5):1275-1281,7.
