化工学报 ›› 2015, Vol. 66 ›› Issue (8): 2759-2766.DOI: 10.11949/j.issn.0438-1157.20150820

• 综述与专论 • 上一篇    下一篇

微通道内气-液弹状流动及传质特性研究进展

尧超群1, 乐军2, 赵玉潮1, 陈光文1, 袁权1   

  1. 1 中国科学院大连化学物理研究所, 辽宁 大连 116023;
    2 格罗宁根大学化学工程系, 荷兰 格罗宁根 9747 AG
  • 收稿日期:2015-06-03 修回日期:2015-06-18 出版日期:2015-08-05 发布日期:2015-08-05
  • 通讯作者: 陈光文
  • 基金资助:

    国家自然科学基金项目(21225627,21376234)。

Review on flow and mass transfer characteristics of gas-liquid slug flow in microchannels

YAO Chaoqun1, YUE Jun2, ZHAO Yuchao1, CHEN Guangwen1, YUAN Quan1   

  1. 1 Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    2 Department of Chemical Engineering, University of Groningen, 9747 AG Groningen, The Netherlands
  • Received:2015-06-03 Revised:2015-06-18 Online:2015-08-05 Published:2015-08-05
  • Supported by:

    supported by the National Natural Science Foundation of China (21225627, 21376234).

摘要:

气-液弹状流,又称Taylor流,是一种以长气泡和液弹交替形式流动的流动形态。微通道内气-液弹状流因其气泡与液弹尺寸分布均一、停留时间分布窄、径向混合强等优点,是一种适于强化气-液反应的理想流型。本文首先介绍了微通道内气泡的生成机理、气泡和液弹长度,以及气泡生成阶段的传质特征。其次系统综述了主通道中弹状流动及传质过程的研究进展,包括气泡形状与液膜厚度、液弹内循环和泄漏流特征、气-液传质系数的测量与预测,以及物理与化学吸收过程中的传质特性等方面内容。最后阐述了当前研究的不足并展望了气-液弹状流的研究方向。

关键词: 多相流, 微通道, 微反应器, 气泡, 传质

Abstract:

Gas-liquid slug flow (also termed as Taylor flow) is a flow pattern characterized by the alternate movement of elongated bubbles and liquid slugs. Gas-liquid slug flow operation in microchannels has been found important implications in the enhancement of gas-liquid reactions due to its advantages such as easy control, uniform bubble and slug size, narrowed residence time distribution as well as enhanced radial mixing. This review presents the basic conceptions and recent research progress on flow and mass transfer characteristics during the gas-liquid slug flow in microchannels. The gas bubble formation mechanisms, the corresponding bubble and liquid lengths, and mass transfer during bubble formation are summarized. For regular slug flow in the main section of microchannels, several important aspects are addressed including bubble cross-sectional shape and liquid film profile, internal liquid recirculation and leakage flow through the gutters, gas-liquid mass transfer coefficients and coupling phenomena between flow and mass transfer in physical and chemical absorption processes. Finally, an outlook is given for future research directions in this field.

Key words: multiphase flow, microchannel, microreactor, bubble, mass transfer

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