G. V. Bartkus, N. A. Filatov, A. S. Bukatin, V. V. Kuznetsov
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引用次数: 0
摘要
Abstract The results of an experimental study on the gas-liquid flow structure and interphase mass transfer is presented for a periodic slug flow of ethanol-CO2 mixture in a straight microchannel and a microchannel with a sudden change in the cross-section.实验中,微通道沿其长度方向连续收缩和膨胀,平均横截面为 \(132/times 387\) \(\mu\)m2 。为了测定由于二氧化碳的吸收而导致的沿微通道长度方向的气体蛞蝓的体积变化,使用了高速流动可视化方法,然后进行了数字图像处理。沿通道长度测量了气泡的产生频率、速度、大小和体积变化。根据获得的数据,确定了液体侧的体积传质系数。对直线通道和横截面突然增大的通道所获得的体积传质系数进行了比较:结果表明,由于气泡的脉动形状,横截面突然变化的通道的传质效果略有增强。
Experimental Study of Interphase Mass Transfer for Gas-Liquid Flow in Microchannel with Successive Contractions and Expansions
The results of an experimental study on the gas-liquid flow structure and interphase mass transfer are presented for a periodic slug flow of ethanol-CO2 mixture in a straight microchannel and a microchannel with a sudden change in the cross-section. The experiments were carried out for a microchannel with successive contractions and expansions along its length and average cross-section of \(132\times 387\)\(\mu\)m2. For determination of the change in the volume of the gas slug along the microchannel length because of CO2 absorption, the method of high-speed flow visualization was used, followed by digital image processing. The frequency of generation, speed, size, and volume variation of the gas bubbles were measured along the length of the channel. From the data obtained, the volumetric mass transfer coefficient from the liquid side was determined. A comparison was made of the obtained volumetric mass transfer coefficient for the straight channel and for the channel with sudden enlargement of the cross-section: slight enhancement of the mass transfer in the channel with the sudden change in the cross-section, resulting from the pulsating shape of the bubbles, has been shown.
期刊介绍:
Journal of Engineering Thermophysics is an international peer reviewed journal that publishes original articles. The journal welcomes original articles on thermophysics from all countries in the English language. The journal focuses on experimental work, theory, analysis, and computational studies for better understanding of engineering and environmental aspects of thermophysics. The editorial board encourages the authors to submit papers with emphasis on new scientific aspects in experimental and visualization techniques, mathematical models of thermophysical process, energy, and environmental applications. Journal of Engineering Thermophysics covers all subject matter related to thermophysics, including heat and mass transfer, multiphase flow, conduction, radiation, combustion, thermo-gas dynamics, rarefied gas flow, environmental protection in power engineering, and many others.