定壁温条件下竖直管内沸腾传热特性研究

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英文篇名：Study on heat transfer characteristics of vertical tube boiling under constant wall temperature 作者：张承虎 ; 魏继宏 ; 王欣 ; 张建利 英文作者：Zhang Chenghu;Wei Jihong;Wang Xin;Zhang Jianli;School of Architecture, Harbin Institute of Technology, Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology, Ministry of Industry and Information Technology; 关键词：竖直蒸发 ; 混合模型 ; 数值模拟 ; 管内静压 ; 沸腾传热 英文关键词：vertical evaporation;;mixture model;;numerical simulation;;in-tube static pressure;;boiling heat transfer 中文刊名：NCNY 英文刊名：Renewable Energy Resources 机构：哈尔滨工业大学建筑学院寒地城乡人居环境科学与技术工业和信息化部重点实验室; 出版日期：2019-04-15 出版单位：可再生能源 年：2019 期：v.37 基金：哈尔滨工业大学科研创新基金(HIT.NSRIF.2017056) 语种：中文; 页：NCNY201904024 页数：8 CN：04 ISSN：21-1469/TK 分类号：155-162

摘要

文章建立了应用于蒸发器的满液式竖直管三维物理模型,并采用多相流混合模型对满液式竖直管内的沸腾传热特性进行数值模拟。而后根据模拟结果得到管内静压、管壁加热温度和管长对满液式竖直管内流体的温度、含气率以及该竖直管沸腾传热系数的影响规律,并分析管壁加热温度、管长、管内静压和蒸发温度对满液式竖直管内沸腾传热特性的影响。分析结果表明:满液式竖直管的长度越长,蒸发器的总换热量越大;当满液式竖直管的壁面温度由376 K升高至388 K时,若该竖直管的长度为1.6 m,则其沸腾传热系数提高了7.4%,若该竖直管的长度为1.2,1.0 m,则其沸腾传热系数均升高了约3.3%;在蒸发器竖直管沸腾传热过程中,其换热量和壁面温度呈正相关;当蒸发温度较低时,满液式竖直管内的静压对管内流体的含气率以及该竖直管的沸腾传热系数影响较大。
        A three-dimensional model of flooded vertical tube in evaporator is established, in which, the multi-phase flow mixture model is employed to simulate the characteristics of the boiling heat transfer of water. The influences of in-tube static pressure, wall heating temperatures and tube length on the distribution of fluid temperature, the gas content and the coefficient of boiling heat transfer are obtained. The effects of wall heating temperatures, the tube length on the characteristics of the boiling heat transfer, the in-tube static pressure and the evaporation temperature on the characteristics of the boiling heat transfer are analyzed. The results show that,the longer the flooded vertical tube, the larger the total heat transfer of itself will be. When the wall heating temperature of vertical tube increases from 376 K to 388 K, the coefficient of the boiling heat transfer increases by 7.4% for the tube with the length of 1.6 m, while for the tubes with the length of 1.2 m and 1.0 m, the coefficient of the boiling heat transfer increases by about3.3%. The heat transfer of the vertical tube in the boiling heat transfer process is positively correlated with the wall heating temperature. In addition, under the condition of low evaporation temperature, the effect of static pressure in the flooded vertical tube on the gas content and the coefficient of the boiling heat transfer is significant.

引文

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