泡流型态模拟用气液混合器设计与实验研究

Design and Experimental Study on Gas-liquid Mixer for Bubble Flow

在理论分析空气与水的混合以及对常用气液混合器结构和混合方式对比分析的基础上,运用三维绘图软件UG NX,设计四通与多孔喷管组成的同心管结构,采用气泡最大比表面积+二维流体体积(2D-VOF)组合计算方法,优化多孔喷管参数,研制出一种可模拟稳定泡流的新型气液混合器,并利用高速摄像机分析该混合器流型模拟效果。结果表明:该混合器在0~250 L/h气体流量下可获得稳定的泡流型态;气体流量增大至300 L/h时,实现泡流到段塞流转变,气体流量增大至800 L/h时,实现段塞流到过渡流转变,不影响其他流型模拟,提升了实验效果。

Based on the analysis of mix for water and air,and the structure and ways of the common mixers,the concentric tube structure with four-way and multi-hole nozzle was designed by UG NX,the parameters of multi-hole nozzle were got by themethods of maximum specific surface area of bubbles and 2D-VOF,a new type of gas-liquid mixer which can simulate stable bubble flow was developed,the bubble flow simulation was run by the high speed camera.The result shows that using this mixer,a bubble flow is got in the vertical wellbore under 0~250 L/h gas flowrate,a slug flow is created until the gas flowrate up to 300 L/h,a transition flow is formed until the gas flowrate up to 800 L/h;and the mixer does not hinder other flow regime simulation.Thesepromote the simulation quality,andthemethods of maximum specific surface area of bubbles and 2D-VOF are feasible,reliable and generalizable.