摘要
以去离子水为工质,对微阵列射流冲击光滑和肋化表面的传热特性进行了实验研究,并以光滑表面传热性能为基准,讨论了肋化表面强化因子(ε)变化规律.实验结果表明:①浸没和自由射流的传热系数均受无量纲射流距离(H/d)影响;提高射流Re数和减小无量纲孔间距(S/d)都能够增强换热.②浸没射流ε受H/d影响大,而自由射流ε基本不受H/d影响;两种射流方式的ε都随Re数增大,且渐趋于一个常数.③对流热阻在各种射流情况下均随流量不断下降,但下降趋势逐渐平缓,当流量大到一定时,热阻基本不再降低.
An investigation on heat transfer of a micro-jet array impinging smooth and pin fin surfaces was conducted. The experimental results indicate that： （1）the dimensionless nozzle-to-target spacing（H/d） has notable effects on heat transfer coefficient of both freesurface and submerged jet impingement, and heat transfer may be enhanced with increasing Reynolds number or decreasing dimensionless jet-to-jet spacing （S/d）. （2） the enhancement factor （ε） is not influenced by H/d for free surface jet, but it is sensitive to variation of H/d for submerged jet. For both flee-surface and submerged jet impingement, ε increases with increasing Re. （3）The convection resistance decreases, at first rapidly and then slowly, with increasing liquid flow rate.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2009年第1期7-12,共6页
Journal of Aerospace Power
基金
北京市教育委员会科技计划重点项目(KZ200710005001)
教育部博士点学科专项科研基金(20070005009)
关键词
微阵列射流
肋化表面
强化因子
对流热阻
micro-jet array
pin fin surface
enhancement factor
convection resistance
