An online method to measure mass transfer of slug flow in a microchannel
An online method to measure mass transfer of slug flow in a microchannel
复制标题
微通道内段塞流传质在线测量方法
DOI：
10.1016/j.ces.2014.03.016
复制
发表时间：
2014-06-14
影响因子：
4.7
通讯作者：
Chen, Guangwen
中科院分区：
文献类型：
--
作者：
Yao, Chaoqun;Dong, Zhengya;Chen, Guangwen
在THON型微通道中研究了弹状流条件下CO2气泡的物理吸收。基于气泡的吸收速率，提出了一种在线照相测定传质系数的方法。通过对压力降引起的气泡膨胀的计算以及与文献结果的比较，验证了该方法的有效性。以乙醇溶液为研究对象，研究了流体性质对传质的影响，结果表明，传质系数随乙醇浓度的增加而增大。在气泡形成过程中吸收的气体量已被测量为约2-10%的入口气相，并发现与最大传质速率成线性比例。对于每种流体系统，对于短接触距离，气泡的初始溶解速率差异很小，而最终溶解量仅取决于停留时间。(C)2014爱思唯尔有限公司版权所有。
Physical absorption of CO2 bubbles under slug flow has been studied in a THunction microchannel. Based on the absorption rate of gas bubbles, an online photographic method is proposed to determine the mass transfer coefficients. Validity of this method is verified by evaluating bubble expansion due to pressure drop and by comparing the results with literature. The effect of fluid properties on the mass transfer has also been studied with ethanol solutions, which shows that mass transfer coefficient increases with the increase of ethanol concentration. The amount of gas absorbed during the bubble formation process has been measured to be about 2-10% of the inlet gas phase, and is found to linearly scale with the maximum mass transfer rate. For each fluid system, the initial dissolution rates of bubbles differ very little for short contact distance, whereas, the final amount of dissolution only depends on the residence time. (C) 2014 Elsevier Ltd. All rights reserved.