相变微胶囊悬浮液作为一种潜热型功能流体,其独特的性能使其受到科研工作者的关注。在回顾了现有相变微胶囊悬浮液传热性能的研究进展,对相变微胶囊悬浮液的导热性能、对流传热特性分别进行介绍。讨论了悬浮液的体积浓度、雷诺数(Re)、斯蒂芬数(Ste)、努塞尔数(Nu)及无量纲过冷度等因素对相变微胶囊悬浮液换热能力的影响,以及相变微胶囊悬浮液管内换热特性。本文针对相变微胶囊悬浮液中添加纳米粒子(纳米Al2 O3,纳米Fe,纳米TiO2)和磁性材料对其导热系数和强化传热的提升情况进行了讨论,并指出了目前研究存在的问题和今后研究的发展方向。
As a new type of a latent functional thermal fluid,microencapsulated phase change material suspen-sion (MPCMS)has attracted much attention of researchers due to its unique properties.This paper reviews pre-vious studies and developments with regard to the heat transfer properties of a MPCMS.We analyzed the rela-tionship between several key parameters and heat transfer ability of MPCMS.These key parameters include the volume concentration of the suspension,the Reynolds number (Re),the Stefan number (Ste),the Nusselt number (Nu).We characterized both thermal conductivity and convection heat transfer,and we discuss how these properties can be significantly improved by adding nanoparticles (nano-Al2 O3 ,nano-Fe,nano-TiO2 )or magnetic materials.Furthermore,the key issues related to the heat transfer of MPCMS which needed to be solved in future were further pointed out.
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