射流冲击换热强化的场协同及热力学耦合  

Field synergy and thermodynamic coupling for enhancement of jet-impinging heat exchange

作　　者：卢小平[1] 何爱玲[1] 郭丹丹[1] 

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730050

出　　处：《兰州理工大学学报》2015年第5期59-61,共3页Journal of Lanzhou University of Technology

基　　金：甘肃省自然科学基金(111ZRJA034)

摘　　要：射流冲击换热具有广泛的工程应用背景,其垂直入射时的局部传热强化效应已得到了实验及数值方法验证.基于流动换热过程的热流散度方程,分别就固体壁面被加热及冷却两种情况,对射流冲击换热中传热及传质过程的交叉效应进行热力学分析.结果表明,射流冲击换热中蕴含了能量传递及转换过程的两种强化机制,即两个自发过程之间的场协同机制及一个自发过程与一个非自发过程之间的热力学耦合机制;无论加热壁面还是冷却壁面的情况下,当冲击流垂直壁面入射时,局部换热效果达到最优.揭示射流冲击换热强化的热力学机制,将为各种动力机械通过改变射流冲击叶片方式提高其能量传递转换效率提供理论基础.Jet-impinging heat exchange has extensive background of engineering application.The transfer enhancement effect of local heat-transfer with normal incidence of the jet has been verified with experimental and numerical method.Based on the heat-flux divergence equation of flowing heat exchange process,the thermodynamic analysis of the cross effect between mass-transfer and heat-transfer in the process of impinging heat exchange on heated and cooled solid wall is conducted,respectively.The results show that the jet-impinging heat exchange contains two enhancement mechanisms of energy transfer and conversion process,namely the field synergy mechanism of two spontaneous process and thermodynamic coupling mechanism of a spontaneous process with a non-spontaneous process and the local heat exchanging effect will reach its optimum when the impinging jet is normal to the wall and either the wall is heated or cooled,thus revealing the thermodynamic mechanism of jet-impinging heat exchange enhancement and providing a theoretical basis of improving energy transfer and conversion efficiency in various power machineries by means of changing the manner of jet-impingement onto their blades.

关 键 词：射流冲击换热 热流散度方程 热力学耦合 场协同 

分 类 号：TK124[动力工程及工程热物理—工程热物理]