化工进展2024，Vol.43Issue(4)：1711-1719,9.DOI:10.16085/j.issn.1000-6613.2023-0622
竖直铯热管传热特性的实验和数值模拟
Experimental and numerical simulation on heat transfer characteristics of vertical cesium heat pipes
摘要
Abstract
Medium-temperature cesium heat pipes'expensive cost and the active chemical properties of cesium medium,lead to a big difficulty for experimental study.Thus,it is of great significance to analyze and predict the start-up characteristics and internal phase-change heat transfer of the cesium heat pipe by numerical simulation.Firstly,the frozen start-up experiment of a vertical cesium heat pipe was carried out,and based on current heat pipe simulation models,an adaptive model with consideration of the linkage of evaporator and condenser was established by UDF.As proved,the maximum temperature difference of the heat pipe wall between the experimental and the numerical simulation result was less than 20K,and the sudden temperature drop at the end of the condenser was present realistically,which proved the accuracy of the model.Secondly,based on the frozen start-up experiment of a vertical cesium heat pipe with variable heating power,the evolution of wall temperature and internal phase distribution of the heat pipe during the start-up process was simulated,and the average difference of wall temperature was used to evaluate the temperature uniformity over the effective length.At last,with various evaporator lengths(200mm and 120mm),heating powers(1028.2W and 844.4W)and filling ratios(8.8％,12％and 15％),the phase distribution,temperature distribution and pressure distribution were compared and analyzed in simulation.The optimum matching condition of the evaporator length and the filling ratio was obtained by considering of the effective working length,temperature uniformity,condensate stacking and dry-out phenomena in the evaporator.The content had great potential significance for the optimal design of heat pipes.关键词
传热/多相流/数值模拟/热管/相分布/均温性Key words
heat transfer/multiphase flow/numerical simulation/heat pipe/phase distribution/temperature uniformity分类
能源科技引用本文复制引用
赵吉隆,郭宇翔,陈宏霞,袁达忠,杜小泽..竖直铯热管传热特性的实验和数值模拟[J].化工进展,2024,43(4):1711-1719,9.基金项目
国家自然科学基金(52176152) （52176152）
北京市自然科学基金(3222046) （3222046）
国家自然科学基金创新群体项目(51821004). （51821004）
