近壁面气泡凝结及其对微细化沸腾影响研究  

Investigation on Near-wall Bubble Condensation and Its Effect on Microbubble Emission Boiling

作　　者：唐继国 李佳冀 胡瑞 王文婷 徐铃淼 李晓 TANG Jiguo;LI Jiaji;HU Rui;WANG Wenting;XU Lingmiao;LI Xiao(State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610065,China;No.703 Research Institute of CSSC,Harbin 150078,China)

机构地区：[1]四川大学水利水电学院水力学与山区河流开发保护国家重点实验室,成都610065 [2]中国船舶集团有限公司第七〇三研究所,哈尔滨150078

出　　处：《工程热物理学报》2023年第1期171-174,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.52076144,No.51706149);四川省科技计划资助(No.2021YJ0374)。

摘　　要：本文基于VOF方法和Schrage相变模型,对过冷水中近壁面气泡凝结进行了研究,以探索微细化沸腾传热机理。数值计算结果表明,气泡-壁面间距与气泡初始半径之比H/R_(0)对凝结过程有着明显的影响。H/R_(0)>1.5时,气泡尺寸变化不受H/R_(0)影响;但当H/R_(0)<1.5时,气泡凝结速率随H/R_(0)减小而增加。在凝结后期,气泡周围形成高速射流,其最大速度可达0.6 m/s。结合实验发现,近壁面气泡凝结所致射流在微细化沸腾传热过程中起着重要作用。Bubble condensation near a wall in subcooled liquid was investigated using VOF method and Schrage phase change model in this study. Numerical results showed that the ratio of distance between bubble and distance to bubble initial radius H/R_(0)has an obvious effect on condensation process. For H/R_(0)> 1.5, the variation in bubble size is independent on H/R_(0), however the bubble condensation rate increases with the decrease in H/R_(0)for H/R_(0)> 1.5. At the late stage of condensation, a high-speed liquid jet is formed. Its maximum velocity can reach 0.6 m/s. Combining with experiments, it is found that the liquid jet induced by the near-wall bubble condensation play an important role in the heat transfer of microbubble emission boiling.

关 键 词：微细化沸腾 气泡凝结 射流 

分 类 号：TK124[动力工程及工程热物理—工程热物理]