水平管降膜管间流型转变实验研究  

Experimental Study of the Transition of Flow Patterns Between Horizontal Falling Film Tubes

作　　者：孙文倩[1] 徐震[1] 路源[1] 肖云汉[1] 

机构地区：[1]中国科学院工程热物理研究所,中国科学院先进能源动力重点实验室能源动力研究中心,北京100190

出　　处：《热能动力工程》2013年第5期477-481,550-551,共5页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金资助项目(51006105);江苏省科技厅项目(BY2011191);连云港市科技攻关计划(工业)项目(CG1210)

摘　　要：准确预测溶液管间流型是利用水平管降膜技术的吸收器和蒸发器确定不同流量下传热传质性能的前提。建立了水平管降膜实验台,以水和4种不同浓度的CaCl2溶液作为测试流体,对不同Re数流体管间流型转变过程进行了实验研究。利用最小方差法拟合实验数据,得到流量减小、增大及忽略流量变化方向的流型转变关系。研究结果表明:滞后现象存在流体的每一个流型转变过程中;CaCl2溶液流型转变对应的Re数随溶液浓度增大而减小;吸收剂质量流量不变,随着吸收过程的进行,可能发生反向流型转变。To accurately predict the flow patterns between the liquid tubes will be the precondition for determining the heat and mass transfer performance by using the absorbers and evaporators involved in the horizontal tube falling film technology. As a result,the authors set up a horizontal tube falling film test rig and experimentally studied the transition process of the flow patterns between the fluid tubes under different Re numbers with water and calcium chloride solution at four different concentrations serving as the testing fluid. The least variance method was used to perform a fitting of the test data to obtain the transition relationship between flow patterns when the flow rate becomes smaller and bigger and the direction change of the flow rate is neglected. The research results show that the lagging behind phenomena exist in each flow pattern transition processes of the fluid and the transition of the flow patterns of calcium chloride solution corresponding to various Re numbers will decrease with an increase of the solution concentration. When the absorbent mass flow rate is kept unchanged,a transition of the flow patterns in the reverse direction may take place with the absorption process.

关 键 词：水平管 降膜 CACL2溶液 流型转变 

分 类 号：TK123[动力工程及工程热物理—工程热物理]