倾斜管内高黏油水两相流的数值模拟

Numerical simulation of high-viscosity oil-water two-phase flow in inclined pipe

采用Fluent三维数值模拟方法研究了倾斜管内高黏油水乳化前后的流动状态,从流型与压降两方面总结了油水两相流的流动规律。实验结果表明,乳化前油水两相流的流型呈现油水交替、泡状流、水塞流、弹状流和环状流,而乳化后则以分层流、分散流、分层流且带有水包油为主。在一定倾角和入口流速下,管内压降随含水率的增加急剧减小;在一定入口流速和含水率下,管内压降随倾角增加逐渐减小。正交实验结果表明,入口流速对压降的影响最大,含水率次之,倾角的影响最小;最优组合为倾角20°、入口流速0.4 m/s、含水率40%。

The flow state of high-viscousity oil-water in inclined tubes before and after emulsification was studied by Fluent three-dimensional numerical simulation method.The flow law of oil-water two-phase flow was summarized from the aspects of flow pattern and pressure drop.The experimental results show that before the emulsification,the oil-water two-phase flow presents oil-water alternating,bubble flow,water plug flow,slug flow and annular flow,but after emulsification,it presents stratified flow,dispersed flow,stratified flow mainly with oil-in-water.The pressure drop in the tube decreases sharply with the increase of water content at a certain inclination angle and inlet velocity.Under the certain inlet velocity and water content,the pressure drop in the tube decreases gradually with the inclination angle increasing.Orthogonal test results show that the inlet velocity has the greatest effect on pressure drop,followed by water content,and the inclination has the least effect.The optimal combination is an inclination angle of 20°,an inlet velocity of 0.4 m/s,and a water content of 40%.