流体域内热量传递过程的导热-对流并联热阻分析方法  

Analysis methodology of thermal conduction-advection resistance in parallel during heat transfer in the fluid domain

作　　者：王秋旺[1] 李香璇 王婷[1] 麻世鸿 张波[1] 马挺[1] WANG QiuWang;LI XiangXuan;WANG Ting;MA ShiHong;ZHANG Bo;MA Ting(Key Laboratory of Thermo-Fluid Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学热流科学与工程教育部重点实验室,西安710049

出　　处：《中国科学：技术科学》2024年第9期1789-1796,共8页Scientia Sinica(Technologica)

基　　金：国家自然科学基金(批准号:52130609)资助项目。

摘　　要：热阻理论被广泛用于传热过程问题的分析,传统的热阻分析方法往往只适用于一维、稳态、无内热源的热传导问题.然而,在能源电力、石油化工、航空航天等工程应用中还涉及热对流问题.针对此问题,本文提出了流体域内、多维导热-对流并联热阻分析方法以及总体热阻的概念,构建了热阻网络模型,并通过分析通道内强制对流问题证明了导热-对流并联热阻分析方法的实用性.流体域内的面积对流热阻与温度梯度及速度大小和方向密切相关,速度越大,面积对流热阻越小,同时面积对流热阻存在“负热阻”现象,相当于流体域内的“热源”或“热汇”.研究结果表明,导热-对流并联热阻网络的建立对于分析流动传热过程,以及指导传热过程的调节和优化具有重要意义.The thermoelectric analogy method and thermal resistance are widely used to solve heat transfer problems to simplify the analysis process of complex heat transfer networks.Traditional thermal resistance is usually applicable to one-dimensional steady-state heat conduction problems.However,heat convection is always involved in engineering applications,such as energy power,petrochemicals,and aerospace.To solve this problem,the concepts of multidimensional thermal conduction-advection parallel resistance analysis in the fluid domain and overall thermal resistance are proposed in this study,and a thermal resistance network is constructed.The area-averaged advection thermal resistance in the fluid domain is closely related to the magnitude and direction of the temperature gradient and velocity.The higher the velocity is,the smaller the area-averaged advection thermal resistance.Simultaneously,“negative thermal resistance”exists in the area-averaged advection thermal resistance,which is equivalent to a“heat source”or“heat sink”in the fluid domain.Results showed that the thermal conduction-advection parallel resistance network plays an important role in the analysis of the flow and heat transfer process and in guiding the regulation and optimization of the heat transfer process.

关 键 词：热电比拟方法 局部热阻 对流热阻 传热调控 并联热阻 

分 类 号：TK124[动力工程及工程热物理—工程热物理]