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

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器的程度，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。

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

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.