微通道内气液传质特性.pdf

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化工.进展
2011年第30卷增刊
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
95
研究开发
微通道内气液传质特性
付涛涛,朱春英,王东继,季喜燕,马友光
(天津大学化工学院,化学工程联合国家重点实验室,天津300072)
摘:研究了竖直放置Y形100PmX400Pm和T形100pm×800Hm两种矩形機衝微通進内CO-蒸馏水气液
两相流的质量传递行为,计算了体系的液相侧体积传质系数ka。在T形100m×800m矩形機面微通道内,当
蒸懈水表观速率JL>0.03m/s时,CO2蒸馏水气液两相流的液相倒体积传质系数ka可达0.024~26.8s,比常
規尺度气一液接触设备至少提高了2个数量级。微通道中液相体积传质系数ka同时受气液表观速率和气液两
相流型的响。在相同的气液两相流型下,ka随气液表观速率的增大而增大,而对于不同的气液两相流型,液
环流时k4最大。果表明懺通道装能显著張化传质。
关词:通道;传质;气液两相流;液流;过程强化
中图分类号:TQ021.4
文标志码:A
文章编号:1000-6613(2011)Z2-0095-04
Mass transfer characteristics for gas-liquid
two-phase flow in microchannels
FU Taotao, ZHU Chunying, WANG Donji, JI Xiyan, MA Youguang
State Key Laboratory of Chemical Engineering, School of Chemical Engineering and
echnology, Tianjin University, Tianjin 300072, China)
Abstract Mass transfer for C2 -water gas-liquid two-phase flow in both the vertical Y-shaped
100 m X 400 Hm and vertical T-shaped 100 mm 800 Hm rectangular microchannels was studied
in this paper. The liquid side volumetric mass transfer coefficient kl.a for CO)2 water system was
calculated using the PVT relationship of gas phase. Results showed that kla was in the range of
0.024-268s in the T-shaped 100 Hm X 800 um rectangular microchannel when the superficial
velocity of the water was larger than 0.03 m/s, and it was at least two orders of magnitude
larger than that in conventional gas-liquid contactors. The liquid side volumetric mass transfer
coefficient ka was affected by both the flow patterns and the superficial flow rates of gas and
liquid phases. It showed that kla increased with the increase of the superficial flow rate of both
gas-liquid two-phase mass transfer was significantly enhanced in microchannel s
phases, and it reached a maximum under the annular flow pattern. The results signified that the
Key words: microchannel; mass transfer; gas-liquid two phase flow; annular flow; process inten-
Cation
20世纪90年代初,可持续与高新技术发展的
需要促进了微化工技术的研究,其主要研究对象为收稿目期:2010902
特征尺度为微米级的微通道13。由于尺度微型化
甚金项目:国家自燃科学基金(20876107,209113358)及化学
工程国家重点实验室开放基金(SKL-ChE-O8BO6)。
使得微通道内系统的传热传质性能与常规尺度下的第ー一作者:付涛(1983-),博士,讲师. E-mail ttu a tiu
相比有很大程度的提高,即系统微型化可实现化工cdcn,联系人,马友光?博士,研究员,博士生导师,主要从事
过程强化这一目标,在气体的吸收、脱吸、直接
传质与分离工程、微化工过程与技术等研究工作。 E mail gma(@