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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >The effects of surface tension on flooding in counter-current two-phase flow in an inclined tube
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The effects of surface tension on flooding in counter-current two-phase flow in an inclined tube

机译：表面张力对倾斜管中逆流两相流中驱油的影响

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摘要

The purpose of the present study is to investigate the effects of surface tension on flooding phenomena in counter-current two-phase flow in an inclined tube. Previous studies by other researchers have shown that surface tension has a stabilizing effect on the falling liquid film under certain conditions and a destabilizing or unclear trend under other conditions. Experimental results are reported herein for air-water systems in which a surfactant has been added to vary the liquid surface tension without altering other liquid properties. The flooding section is a tube of 16 mm in inner diameter and 1.1 m length, inclined at 30-60° from horizontal. The flooding mechanisms were observed by using two high-speed video cameras and by measuring the time variation of liquid hold-up along the test tube. The results show that effects of surface tension are significant. The gas velocity needed to induce flooding is lower for a lower surface tension. There was no upward motion of the air-water interfacial waves upon flooding occurrence, even for lower a surface tension. Observations on the liquid film behavior after flooding occurred suggest that the entrainment of liquid droplets plays an important role in the upward transport of liquid. Finally, an empirical correlation for flooding velocities is proposed that includes functional dependencies on surface tension and tube inclination.
机译：本研究的目的是研究斜管中逆流两相流中表面张力对溢流现象的影响。其他研究人员先前的研究表明，表面张力在一定条件下对下落的液膜具有稳定作用，而在其他条件下具有不稳定或趋势不明确的趋势。本文报道了用于空气-水系统的实验结果，其中已添加表面活性剂以改变液体表面张力而不改变其他液体性质。溢流段是一个内径为16 mm，长度为1.1 m的管，与水平方向成30-60°倾斜。通过使用两个高速摄像机并通过测量沿试管中液体滞留的时间变化来观察溢流机理。结果表明表面张力的影响是显着的。对于较低的表面张力，引起溢流所需的气体速度较低。甚至在降低表面张力的情况下，淹没时空气-水界面波也没有向上运动。对注水后液膜行为的观察表明，液滴的夹带在液体的向上输送中起重要作用。最后，提出了与驱替速度的经验相关性，其中包括对表面张力和管道倾角的函数依赖性。

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