液-液两相流的共直线液滴运动聚结特性  

Coalescence characteristics of collinear moving drops of liquid-liquid two-phase flow system

作　　者：王宇岑 国丽萍[1] WANG Yucen;GUO Liping(Northeast Petroleum Universit)

机构地区：[1]东北石油大学

出　　处：《油气储运》2018年第8期891-896,共6页Oil & Gas Storage and Transportation

基　　金：国家自然科学基金重点项目"W/O型含蜡原油乳状液触变特性及其微观机理研究";51404072;国家自然科学基金重点项目"含蜡原油管道安全经济输送的基础问题研究";51534004;黑龙江省博士后基金"基于多种加载模式的W/O型含蜡原油乳状液胶凝流变特性研究";LBZ-Z16036

摘　　要：当前液-液两相流理论研究多集中于液滴群在反应器内的宏观动力学行为,对于微观下液滴与液滴相互作用机理的研究尚不彻底。为了研究油水两相流共直线上升的双液滴(油滴)之间的相互作用,基于液-液两相流理论,运用COMSOL仿真软件Cahn-Hilliard方程的相场方法建立了油滴运动模型,模拟了油滴间距离、油滴粒径、两相物性等参数对双油滴间相互作用的影响规律,进而分析油滴之间的尾流对油滴聚结的影响。结果表明:先行油滴的尾流影响跟随油滴的上浮速度,从而促使两油滴发生聚结,随着油滴间距离的增大,影响减弱,且油滴粒径越大、黏度越小,聚结时间越短。研究结果为更复杂的液-液两相流体系研究提供了参考。At present, the theoretical study of liquid-liquid two-phase flow mostly focuses on the macro-kinetics behaviors of liquid drop swarms in the reactors while the microscopic mechanisms of drop-drop interaction are not researched thoroughly. In order to investigate, the interaction between two collinear rising liquid drops（oil drops） of oil-water twophase flow, based on the theory of liquid-liquid two-phase flow, the oil-drop motion model was established by using the phase field method of Cahn-Hilliard equation in the simulation software COMSOL. By virtue of this model, the influences of drop-drop distance, drop size and two-phase physical parameters on the drop-drop interaction were simulated and the effects of the wake between drops on the drop coalescence were analyzed. It is indicated that leading drop＇s wake affects the floating velocity of its following drop, promoting the coalescence of two drops. And the larger the drop-drop distance is, the weaker the effect is. And the larger the drop size is and the lower the viscosity is, the shorter the coalescence time is. The research results provide the reference for the further study of more complex liquid-liquid two-phase flow systems.

关 键 词：液-液两相流 相互作用 相场方法 动力学研究 聚结特性 COMSOL仿真软件 

分 类 号：TE832[石油与天然气工程—油气储运工程]