对流换热场协同的散度效应  

Divergence effect of field synergy for convective heat transfer

作　　者：卢小平[1] 俞树荣[1] 

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730030

出　　处：《化工学报》2011年第9期2464-2468,共5页CIESC Journal

基　　金：国家自然科学基金项目(50965010)~~

摘　　要：场协同原理是基于稳态时层流热边界层的积分方程得到的,其正确性已得到了实验及数值验证。但目前尚缺乏从普遍意义上对场协同角的不同范围与附加当量源性质之间的关系,及其对换热过程产生强化或弱化的内在机理进行理论描述,而这些对于应用场协同原理进行传热过程控制是至关重要的。本文通过建立描述对流换热过程的总热通量矢量的散度方程,给出了具有普适性的场协同原理的理论分析方法。结果表明,场协同的程度导致了散度的变化,而由于散度表征了区域内的源与区域边界上流的关系,所以分析场协同角在不同的变化范围时的散度效应,可以得到区域内附加当量源的性质,以及区域边界上总热通量矢量大小及方向的变化情况,从而说明流体流动换热过程被强化或弱化的原因。Field synergy principle is based on the steady state laminar thermal boundary layer integral equations and has been validated by the experimental data and numerical simulations.However,at present,the descriptions for the general relation between the field synergy angles in different scopes and the nature of additional equivalent source and the mechanism for the two effects to enhance or weaken the heat transfer processes are lacking,which are essential for control of the field synergy heat transfer process.In this study,a universal theory for the field synergy principle is obtained through the analysis and establishing an equation for the total heat flux density vector divergence.The results show that the field synergy changes the divergence.Since the divergence reflects the relation between the source in the region and the flow on the border,the analysis of the effect of field synergy angle change on the divergence may identify the nature of additional equivalent source,as well as the change of volume and direction of the total heat flux density vector,so that the mechanism for heat transfer process to be enhanced or weaken is revealed.

关 键 词：对流换热 场协同 理论分析 散度方程 

分 类 号：TK124[动力工程及工程热物理—工程热物理]