流体机械

2020, v.48;No.573(03) 1-5+31

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绕管式换热器层间质量迁移特性的试验研究
Experimental Investigation on Inter-row Mass Migration Characteristics of Spiral Wound Heat Exchangers

密晓光;陈杰;鹿来运;张晓慧;常铮;丁国良;
Mi Xiaoguang;Chen Jie;Lu Laiyun;Zhang Xiaohui;Chang Zheng;Ding Guoliang;R&D Center,CNOOC Gas & Power Group;Shanghai Jiaotong University;

摘要(Abstract):

绕管式换热器已在液化天然气等领域得到应用,其传热性能受到壳侧流体层间迁移的影响。本文通过新建试验台,以水和空气组成便于测量的两相工质,试验研究绕管换热器壳侧流体层间质量迁移特性。试验结果表明:工质在绕管壳侧的层间迁移率受质流密度、干度和入口条件等因素的影响。随着质流密度增大,总的层间迁移率先增大后减小,迁移率最大出现在质流密度120 kg/(m~2·s)工况下;随着干度的增大,总的层间迁移率先增大后减小,最大迁移率发生在干度0.4附近;层间迁移率随质流密度的变化规律在内层入口条件下与在外层入口条件下的相反。在绕管换热器壳侧流动的工质总是倾向于向外侧绕管区域迁移。
Spiral wound heat exchangers have a lot of applications such as liquefied natural gas plants,and their performance is significantly affected by the inter-row mass migration of refrigerants in shell side of the spiral wound heat exchanger.In the present study,an experiment rig was built to investigate the inter-row mass migration characteristics of two-phase fluid in the shell side of the spiral wound heat exchanger using water/air mixture as the two-phase fluid for experiment.The results show that,the inter-row mass migration rate is affected by mass flux,vapor quality and entrance conditions.With the increase of mass flux,the total migration ratio increased first and then decreases.The migration rate reached maximum value at the mass flux of 120 kg/(m~2·s~1).With the increase of vapor quality,the total migration ratio increased firstly and then decreased.The maximum migration ratio appeared when the vapor quality was 0.4.The variation of inter-row mass migration rate with mass flux under the condition of inner entrance was opposite to that under the condition of outer entrance.The working fluid always tended to migrate to the outer layer during the flowing process in the shell side of the spiral wound heat exchanger.

关键词(KeyWords): 绕管换热器;两相;质量迁移;干度;质流密度
spiral wound heat exchanger;two-phase;inter-row mass migration;vapor quality;mass flux

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51674165);; 上海市优秀学术带头人计划项目(16XD1401500)

作者(Author): 密晓光;陈杰;鹿来运;张晓慧;常铮;丁国良;
Mi Xiaoguang;Chen Jie;Lu Laiyun;Zhang Xiaohui;Chang Zheng;Ding Guoliang;R&D Center,CNOOC Gas & Power Group;Shanghai Jiaotong University;

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