毛细管中两相流动特性的电导测量方法  

Measurements of two phase flow characteristics through a circular capillary by double-sensor conductivity probes

作　　者：张庆勇[1] 黄海[1] 周媛[1] 刘辉[1] 李成岳[1] 

机构地区：[1]北京化工大学化工资源有效利用国家重点实验室,北京100029

出　　处：《北京化工大学学报（自然科学版）》2008年第3期9-13,共5页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家'973'计划(2006CB202503);教育部博士点基金资助项目(2006001005)

摘　　要：建立了单毛细管中两相流动传递参数实验系统,基于该系统开发了测取泰勒流下气泡速度、气含率、气泡频率以及液栓长度等参数的双电导测试系统。结果表明,与常用的摄像法进行比较,双电导探针具有在线、实时和动态响应快等特点,可替代摄像法,并可扩展应用于结构化催化剂内部测定气液两相流动参数分布。同时,采用电导法对毛细通道中多种流型——包括分散气泡流、气泡串流、泰勒流、膜流及多种过渡流型——进行辨识,取得了较好的实验结果。A capillary two phase flow system was set up and used to develop a double-sensor conductivity method for measuring two phase Taylor flow characteristics through a circular capillary, including bubble velocity, void fraction, bubble frequency and liquid slug length. Compared with imaging methods, the double-sensor conductivity probe method was found to be effective and practical, and its potential for use in measuring the distribution of the Taylor flow two-phase parameters in a non-transparent bed, such as a monolithic reactor bed was clearly demonstrated. Furthermore, the conductivity probe can be used to identify the observed flow regimes, such as dispersed bubble flow, bubble-chain, slug or Taylor and annular flows demonstrating that the conductivity probe method is also effective for flow regime identification of capillary two phase flows.

关 键 词：双电导探针 泰勒流动 气泡速度 气含率 摄像法 流型识别 

分 类 号：TQ021.4[化学工程]