等壁温条件下潜热型功能热流体换热强化机理的理论研究  

THEORETICAL ANALYSIS OF THE CONVECTIVE HEAT TRANSFER ENHANCEMENT OF LATENT FUNCTIONALLY THERMAL FLUID WITH ISOTHERMAL WALL

作　　者：胡先旭[1] 张寅平[1] 

机构地区：[1]清华大学热能工程系,北京100084

出　　处：《太阳能学报》2002年第5期626-633,共8页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金资助项目 (5 0 0 760 2 0 );国家重点基础研究发展规划项目 (G2 0 0 0 0 2 63 0 9);教育部优秀青年教师资助计划项目 (教人司 [2 0 0 1] 3 9号 )

摘　　要：从对流与导热的相似性出发 ,揭示了潜热型功能热流体强化换热的物理机制。基于等效比热模型 ,对影响速度充分发展的等壁温圆管内该类流体层流流动换热强化的各因素进行了敏感性分析 ,弄清了影响换热强化的主要因素及其强化换热的机理 ,并改进了内部流动传统的Nu定义 ,使之能完全表征功能热流体换热强化的程度 ,并和外部流动的Nu定义统一 ,有助于内部流动和外部流动对流换热的统一评价。This paper analyzes the convective heat transfer enhancement mechanism of latent functionally thermal fluid based on the analogy between convective heat transfer and heat conduction with thermal sources. By using the effective specific heat capacity model, the influence of each factor affecting the heat transfer enhancement of laminar flow in the tube with isothermal wall is analyzed. The main influencing factors and the mechanisms of heat transfer enhancement are clarified. A modification of the conventional Nusselt number definition for internal flow is introduced to describe the degree of heat transfer enhancement for latent functionally thermal fluid more effectively. It also enables consistent evaluation of the convective heat transfer of internal and external flows.

关 键 词：等壁温 潜热型 功能热流体 换热强化机理 相变 微胶囊 相变材料 

分 类 号：TK124[动力工程及工程热物理—工程热物理]