Transport of Wetting and Nonwetting Liquid Plugs in a T-shaped Microchannel  

作　　者：雍玉梅 李莎 杨超 尹小龙 

机构地区：[1]Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China [2]Petroleum Engineering Department, Colorado School of Mines, Golden, CO 80402, USA

出　　处：《Chinese Journal of Chemical Engineering》2013年第5期463-472,共10页中国化学工程学报（英文版）

基　　金：Supported by the National Basic Research Program of China（2012CB224806）;the National Natural Science Foundation of China（20990224,21276256）;the National Natural Science Fund for Distinguished Young Scholars（21025627）;the National High Technology Research and Development Program of China（2012AA03A606）

摘　　要：The transport of liquid plugs in microchannels is very important for many applications such as in medical treatments in airways and in extraction of oil from porous rocks.A plug of wetting and non-wetting liquids driven by a constant pressure difference through a T-shaped microchannel is studied numerically with lattice Boltzmann(LB) method.A two-phase flow LB model based on field mediators is built.Three typical flow patterns(blocking,rupture and splitting flow) of plug flow are obtained with different driving pressures.It is found that it becomes difficult for a plug with short initial plug length to leave the microchannel;the flow pattern of plug transport varies with the contact angle,especially from wetting to nonwetting;with the increase of interfacial tension,the front interface of plug moves faster;the front and rear interfaces of the plug with small viscosity ratio move faster in the microchannel than those of the plug with large viscosity ratio.The study is helpful to provide theoretical data for the design and scale-up of liquid-liquid reactors and separators.The transport of liquid plugs in microchannels is very important for many applications such as in medical treatments in airways and in extraction of oil from porous rocks.A plug of wetting and non-wetting liquids driven by a constant pressure difference through a T-shaped microchannel is studied numerically with lattice Boltzmann（LB） method.A two-phase flow LB model based on field mediators is built.Three typical flow patterns（blocking,rupture and splitting flow） of plug flow are obtained with different driving pressures.It is found that it becomes difficult for a plug with short initial plug length to leave the microchannel;the flow pattern of plug transport varies with the contact angle,especially from wetting to nonwetting;with the increase of interfacial tension,the front interface of plug moves faster;the front and rear interfaces of the plug with small viscosity ratio move faster in the microchannel than those of the plug with large viscosity ratio.The study is helpful to provide theoretical data for the design and scale-up of liquid-liquid reactors and separators.

关 键 词：lattice Boltzmann method plug flow contact angle interfacial tension MICROCHANNEL 

分 类 号：TS827[轻工技术与工程] TK124[动力工程及工程热物理—工程热物理]