微通道内气-液两相传质过程行为及其应用

doi:10.11949/0438-1157.20190710

摘要/Abstract

摘要：

微通道内气-液两相体系中Taylor流和泡状流具有气泡尺寸均一、停留时间分布窄、可调控性强和比表面积高等优点，具有广泛的应用前景。从Taylor气泡和泡状气泡的传质过程出发，系统综述了微尺度下气泡的溶解规律、传质过程机理和传质/溶解模型等方面的研究进展，并介绍上述流型在反应或过程强化、基础物性及动力学数据测量和微纳材料合成方面的应用。最后总结并展望了技术领域的研究难点与研究方向。

关键词: 弹状流, 微通道, 微反应器, 气泡, 传质

Abstract:

The Taylor flow and bubbly flow in gas-liquid two phase systems in microchannels have the advantages of uniform bubble size, narrow residence time distribution, easy control, high specific surface area, and so on. These advantages facilitate them various applications and important implications. Based on the bubble dissolution and mass transfer process during Taylor flow and bubbly flow, this paper systematically reviews the research progress of bubble dissolution, mass transfer process and mass transfer/dissolution model at microscale, and introduces the above flow pattern in reaction or process. Finally, an outlook is given for further research directions in this field.

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

中图分类号:

TK 124

尧超群, 陈光文, 袁权. 微通道内气-液两相传质过程行为及其应用[J]. 化工学报, 2019, 70(10): 3635-3644.

Chaoqun YAO, Guangwen CHEN, Quan YUAN. Mass transfer characteristics of gas-liquid two-phase flow in microchannels and applications[J]. CIESC Journal, 2019, 70(10): 3635-3644.

图/表 8

图1 不同方法测量得到的典型液弹内浓度场

Fig.1 Typical concentration field in liquid slugs

表1 常用的气液传质关联式

Table 1 Typical correlations for gas-liquid mass transfer

文献	关联式
[29]	$k L a = 4.5 D j G / L U C 1 D H$
[30]	$k L a = 2 D H D U B D H L B L U C 0.3$
[24]	$k L a = E q . (8) × μ L 1 m P a ? s - 0.33$
[28]	$k L a = 0.111 j T P 1.19 [(1 - ε G) L U C] 0.57$
[31]	$k L a = 0.133 j T P 1.2 L S D D C H 4 0.5$ 标准单位
[3]	$S h L a D H = 0.084 R e G 0.213 R e L 0.912 S c L 0.5$
[32]	$S h L = 0.69 (1 + 0.724 R e T P 0.48 S c L 1 / 3)$
[17]	$S h L a D H = 1.367 R e G 0.421 R e L 0.717 S c L 0.64 C a T P 0.5$
[33]	$S h L = 0.1 R e T P 0.421 S c L 0.05$

表1 常用的气液传质关联式

Table 1 Typical correlations for gas-liquid mass transfer

文献	关联式
[29]	$k L a = 4.5 D j G / L U C 1 D H$
[30]	$k L a = 2 D H D U B D H L B L U C 0.3$
[24]	$k L a = E q . (8) × μ L 1 m P a ? s - 0.33$
[28]	$k L a = 0.111 j T P 1.19 [(1 - ε G) L U C] 0.57$
[31]	$k L a = 0.133 j T P 1.2 L S D D C H 4 0.5$ 标准单位
[3]	$S h L a D H = 0.084 R e G 0.213 R e L 0.912 S c L 0.5$
[32]	$S h L = 0.69 (1 + 0.724 R e T P 0.48 S c L 1 / 3)$
[17]	$S h L a D H = 1.367 R e G 0.421 R e L 0.717 S c L 0.64 C a T P 0.5$
[33]	$S h L = 0.1 R e T P 0.421 S c L 0.05$

图2 单元传质模型[17]

Fig.2 Unit cell model for mass transfer[17]

图3 三层流模型[38]

Fig.3 Three-layer model for mass transfer[38]

图4 液膜-液弹分区传质模型[39]

Fig.4 Film-slug separate transfer model[39]

图5 Taylor流强化氧化反应[2]

Fig.5 Intensification of oxidation using Taylor flow[2]

图6 基于气泡溶解动力学的物性测量技术[8]

Fig.6 Determination of physical properties based on bubble dissolution[8]

图7 基于微流控的微囊材料合成[61]

Fig.7 Synthesis of micro-capsules material using microfluidics[61]

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