斜管内油水两相流动规律分析

Analysis on regularity of oil-water two-phase flow in inclined tube

斜管除油池是一种常见的重力式油水分离装置,研究"浅池原理"在斜管中的作用机理,为提高装置的油水分离效率提供理论依据。以流体在斜管中的停留时间为特征,利用Stokes公式推导出流体在斜管中的理论停留时间,将之与流体动力学仿真软件FLUENT求解的仿真结果进行对比分析,揭示了离散相油滴在斜管中的流动规律。研究表明:在"浅池原理"的作用下,流体在斜管中的流速降低,流体在斜管中的停留时间延长,离散相油滴间发生碰撞与聚结的概率增大,从而为离散相油滴在混合相中的浮升与分离提供有利条件。

Inclined tube grease-removal tank is a commonly used gravity type oil-water separating equip-ment. Studying the functional mechanism of ＂principles of shallow pool＂ in inclined tube could provide theoreti-cal basis for the efficiency improvement of oil-water separating equipments. Taking residence time of fluid stay in inclined tubes the characteristic parameter, using Stokes formula to elicit theoretical residence time of fluid in in-clined tube, and then, the results was comparatively analyzed with the results gotten from fluid dynamics simula-tion software FLUENT, the flow regularity of the dispersed phase oil droplets in inclined tube was revealed. The study showed that, the flow rate of the fluid in inclined tube decreased under the action of ＂shallow pool princi-ple＂, the residence time of the fluid in the inclined tube was prolonged, and the probability of collision and coa-lescence of dispersed phase oil droplets increased, which provided a favorable condition for the buoyancy lift and separation of dispersed phase oil droplets from the mixing phase.