竖直表面氦的膜状冷凝过程传热传质机理  

Heat and Mass Transfer Mechanisms of Helium Film Condensation on Vertical Surfaces

作　　者：韦涛 陈鑫 朱少龙 植晓琴[1] 邱利民[1] WEI Tao;CHEN Xin;ZHU Shaolong;ZHI Xiaoqin;QIU Limin(Institute of Refrigeration and Cryogenics,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学制冷与低温研究所,杭州310027

出　　处：《工程热物理学报》2024年第7期1897-1907,共11页Journal of Engineering Thermophysics

基　　金：浙江省自然科学基金资助项目(No.LR23E060002)。

摘　　要：液氦作为沸点最低(4.21 K)的重要低温流体,被应用于各种低温系统及低温实验室等。氦的膜状冷凝效率是当前使用低温制冷机的小型氦液化及再冷凝回收系统实现性能提升的关键因素,但目前尚缺乏针对性的理论和实验研究。本文基于现有的实验研究,搭建低温竖直表面氦的膜状冷凝CFD模型,模拟不同冷凝温差下氦在竖直表面的膜状冷凝过程,揭示其液膜分布与传热特性,本研究旨在为小型氦液化系统中氦冷凝器的设计及优化方向提供理论指导。As an important cryogenic fluid with the lowest boiling point(4.21 K), liquid helium is used in various cryogenic systems and cryogenic laboratories. The film condensation efficiency of helium is the key for the performance improvement of small-scale helium liquefaction and recondensation systems using cryocoolers, but there is a lack of targeted theoretical and experimental researches. This study established a CFD model of helium film condensation on vertical surfaces at low temperatures based on existing experimental research. The helium film condensation process on vertical surfaces under different condensing temperature differences was simulated to reveal the heat transfer and liquid film distribution characteristics. This study aims to provide theoretical guidance for the design and optimization of helium condensers in small-scale helium liquefiers.

关 键 词：氦液化 膜状冷凝 CFD模拟 冷凝液膜 传热系数 

分 类 号：TK124[动力工程及工程热物理—工程热物理]