Characteristics of Gas-Liquid Slug Flow in Microchannel by Instantaneous Liquid Film Thickness Measurement

  • SUN Yanhong ,
  • CHEN Wenjie ,
  • LU Jinli ,
  • WANG Changlong
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  • School of Civil Engineering and Architecture, Anhui University of Technology, Ma’anshan 243002, China

网络出版日期: 2023-12-01

基金资助

This work was supported by the Anhui Provincial Natural Science Foundation (Grant No. 2008085QE256).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

Characteristics of Gas-Liquid Slug Flow in Microchannel by Instantaneous Liquid Film Thickness Measurement

  • SUN Yanhong ,
  • CHEN Wenjie ,
  • LU Jinli ,
  • WANG Changlong
Expand
  • School of Civil Engineering and Architecture, Anhui University of Technology, Ma’anshan 243002, China

Online published: 2023-12-01

Supported by

This work was supported by the Anhui Provincial Natural Science Foundation (Grant No. 2008085QE256).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

摘要

本文旨在破译液膜厚度与气液段塞流流体动力学之间的确切关系。通过激光共聚焦位移计(LFDM)和高速相机,开发了一种瞬时测量系统,用于表征液膜的瞬时演变和连续团状流的动态特性。使用内径为 0.75 mm的玻璃管,测试的表观气液速度范围分别为 0.01-1.2 m/s 和 0.01-0.09 m/s。代表气泡段塞流的LFDM非零信号在段塞-环状流型出现时由规则的周期性间隔变为混沌波动。随着表观气体速度从 0.025 增加到 0.78 m/s,周期性间歇性段塞流的主要频率从大约 0.5-2 HZ 增加到接近 10-20 HZ。通过液膜厚度和气泡速度的时间间隔计算的气泡和液塞长度与经验模型具有良好的相关性。同时,由瞬态液膜厚度计算得出的空隙率平均值显示出随气体滞留率的线性增长。

本文引用格式

SUN Yanhong , CHEN Wenjie , LU Jinli , WANG Changlong . Characteristics of Gas-Liquid Slug Flow in Microchannel by Instantaneous Liquid Film Thickness Measurement[J]. 热科学学报, 2022 , 31(4) : 1194 -1205 . DOI: 10.1007/s11630-022-1643-4

Abstract

This paper seeks to decipher the exact relationship between the liquid film thickness and the hydrodynamics of gas-liquid slug flows. An instantaneous measurement system is developed by integrating the laser focus displacement meter (LFDM) and high-speed camera to characterize the temporal evolution of the liquid film and the dynamic characteristics of continuous slug flows. A glass tube with internal diameter of 0.75 mm is used and the tested ranges of superficial gas and liquid velocities are 0.01–1.2 m/s and 0.01–0.09 m/s respectively. The non-zero signals of LFDM representing the bubble slug flows changed from regular periodic intervals to chaotic fluctuations when slug-annular flow pattern appears. The dominant frequencies of the periodic intermittent slug flows increased from about 0.5–2 Hz to nearly 10–20 Hz as the superficial gas velocity rised from 0.025 to 0.78 m/s. The bubble and liquid slug lengths calculated by the time interval of liquid film thickness and bubble velocity correlated well with the empirical model. Meantime, the average value of void fraction derived from the calculation of transient liquid film thickness shows a linear growth with the gas holdup ratio.

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