静止非牛顿流体中气泡生成过程的传质

doi:10.11949/j.issn.0438-1157.20150417

化工学报 ›› 2015, Vol. 66 ›› Issue (11): 4335-4341.DOI: 10.11949/j.issn.0438-1157.20150417

静止非牛顿流体中气泡生成过程的传质

易妍妍¹, 王智慧², 杨超², 毛在砂², 王启宝¹

1 中国矿业大学(北京), 北京 100083;
2 中国科学院过程工程研究所, 生化工程国家重点实验室, 北京 100190

收稿日期:2015-04-02 修回日期:2015-05-28 出版日期:2015-11-05 发布日期:2015-11-05
通讯作者: 王智慧
基金资助:
国家自然科学基金项目(21206166,21427814);国家重点基础研究发展计划项目(2012CB224806)。

Mass transfer during single bubble growing in static non-Newtonian fluid

YI Yanyan¹, WANG Zhihui², YANG Chao², MAO Zaisha², WANG Qibao¹

1 China University of Mining and Technology Beijing, Beijing 100083, China;
2 National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

Received:2015-04-02 Revised:2015-05-28 Online:2015-11-05 Published:2015-11-05
Supported by:
supported by the National Natural Science Foundation of China (21206166, 21427814) and the National Basic Research Program of China (2012CB224806).

摘要/Abstract

摘要：

气泡生成过程中气液传质是气液接触设备的设计、优化的重要参考指标。以二氧化碳气泡在羧甲基纤维素钠(carboxymethyl cellulose,CMC)溶液中生成过程中的传质为研究对象,分别考察了气速、CMC溶液浓度、针头直径对气泡生成过程气液传质的影响,采用具有CCD显微相机的动态接触角分析仪测量了气泡形状、表面积和体积的变化,进而获得气泡生成过程气液传质系数k_l。实验结果表明,CMC浓度从0.2%增加到0.8%,黏度逐渐增大,传质系数随CMC浓度的增大而增大;针头直径从2.5 mm增加到4 mm,传质系数也随之增大;气速从1 ml·min^-1增加到9 ml·min^-1,传质系数也逐渐增大。

关键词: 非牛顿流体, 气泡生成, 传质, 二氧化碳

Abstract:

The mass transfer process of growing bubbles has important effect on the design and optimization of gas-liquid contacting devices. By investigating a single carbon dioxide bubble growing in a sodium carboxymethyl cellulose (CMC) solution, the effects of gas velocity, concentration of CMC solution, and diameter of the needle on gas-liquid mass transfer were examined. The shape, surface area and volume of growing bubble were captured by a dynamic contact angle analysis instrument with a micro-CCD camera and the liquid mass transfer coefficient k_l was calculated. The results show that the mass transfer coefficient increased with the solution viscosity as CMC concentration increased from 0.2% to 0.8%, with the diameter of the needle changing from 2.5 mm to 4 mm, and with the gas injection rate increased from 1 ml·min^-1 to 9 ml·min^-1.

Key words: non-Newtonian fluid, bubble growth, mass transfer, carbon dioxide

中图分类号:

TQ021.4

易妍妍, 王智慧, 杨超, 毛在砂, 王启宝. 静止非牛顿流体中气泡生成过程的传质[J]. 化工学报, 2015, 66(11): 4335-4341.

YI Yanyan, WANG Zhihui, YANG Chao, MAO Zaisha, WANG Qibao. Mass transfer during single bubble growing in static non-Newtonian fluid[J]. CIESC Journal, 2015, 66(11): 4335-4341.

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静止非牛顿流体中气泡生成过程的传质

Mass transfer during single bubble growing in static non-Newtonian fluid

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