摘要
冷凝换热是两相热控系统中的重要物理过程。细致分析不同作用力影响下流动冷凝过程中的气液行为及其换热性能的影响,对冷凝器优化与设计具有一定指导意义。本文采用三维瞬态VOF模型仿真分析了水平细微管内氖工质管内流动冷凝过程,基于网格无关性分析和实验流型对比,验证了模型的可靠性。分析了质量通量、管径及重力效应对氖工质流动冷凝换热系数及截面气液分布的影响。研究结果表明,质量通量增加、管径减小会提高流动冷凝换热效率,重力效应对冷凝换热效率的影响主要取决于截面气液分布,随着干度变化呈现出重力无关、强化换热和恶化换热三种状态。
The condensation flow and heat transfer are an important physics process in two-phase thermal control system.The analysis of the gas-liquid behavior and heat transfer performance in detail during the flow condensation process is of certain significance to the optimization and design of condensers.The current work employs the transient VOF model to simulate the flow condensation of Neon under different working condition.The numerical model is validated by grid independence analysis and comparison of the experiment flow pattern.Basing on the validated model,the effect of mass flux,inner diameter and gravity on the flow condensation heat transfer coefficient and the cross section two phase distribution.The result shows that the flow condensation heat transfer efficiency increases with the increase of the mass flux and the decrease of the inner diameter.The gravity effect on the condensation heat transfer efficiency is determined by the cross section two phase distribution,and shows three states the gravity independence,heat transfer intensification and deterioration.
作者
何发龙
杜王芳
赵建福
苗建印
张红星
刘思学
刘畅
HE Falong;DU Wangfang;ZHAO Jianfu;MIAO Jianyin;ZHANG Hongxing;LIU Sixue;LIU Chang(CAS Key Laboratory of Microgravity,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;Beijing Key Laboratory of Space Thermal Control Technology,Institute of Spacecraft System Engineering,China Academy of Space Technology,Beijing 100094,China;School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China;School of Energy and Safety Engineering,Tianjin Chengjian University,Tianjin 300384)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2023年第3期684-689,共6页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.11972040,No.11802314)
天津市教委科研计划资助项目(No.2020KJ043)。
关键词
流动冷凝
低温工质
换热系数
重力效应
flow condensation
cryogenic working fluid
heat transfer coefficient
gravity effect
