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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 >Phase inversion in dispersed liquid-liquid flows
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Phase inversion in dispersed liquid-liquid flows

机译：分散的液-液流中的相转化

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Phase inversion and its effect on pressure gradient during the dispersed flow of two immiscible liquids have been studied for two pipe materials (steel and acrylic) and two pip sizes (60 and 32 mm ID). Water and oil (796 kg m(-3) density and 2.19 mm(2) s(-1) viscosity) were used as test fluids while the appearance of phase inversion in the acrylic pipes was confirmed with the use of impedance ring probes. In the large pipes (steel and acrylic with 60 mm ID) it was found that the phase inversion point (oil volume fraction where inversion appears) depended on whether the inversion was from oil to water continuous mixture or from water to oil. The difference in the phase inversion points between the two dispersion initialisation conditions increased with increasing mixture velocity. No effect of initial conditions on the inversion point was found for the small acrylic pipe.Phase inversion was in all cases preceded by a large increase in pressure gradient, which was sharply reduced immediately after the new continuous phase was established. The pressure gradient peak was sharper and larger at high mixture velocities than at low ones and in the acrylic pipe compared to the steel one. The change in phase continuity lasted a few minutes and was accompanied by large fluctuations in pressure gradient and mixture impedance. (C) 2004 Elsevier Inc. All rights reserved.
机译：对于两种管道材料（钢和丙烯酸）和两种点尺寸（内径60和32毫米），已经研究了两种不混溶液体分散流动期间的相变及其对压力梯度的影响。水和油（796 kg m（-3）的密度和2.19 mm（2）s（-1）的粘度）用作测试流体，而丙烯酸环管中的相变出现是通过使用阻抗环探头确认的。在大型管道（内径为60 mm的钢和丙烯酸管）中，发现相变点（出现反转的油体积分数）取决于转变是从油到水的连续混合物还是从水到油。两种色散初始化条件之间的相变点差异随混合速度的增加而增加。小型丙烯酸管没有发现初始条件对转变点的影响。在所有情况下，相变都是在压力梯度大幅增加之前发生的，在建立新的连续相后立即急剧降低压力梯度。与钢相比，在高混合速度下，丙烯酸树脂管中的压力梯度峰值比低速峰值更大和更大。相连续性的变化持续了几分钟，并伴随着压力梯度和混合物阻抗的大幅波动。 （C）2004 Elsevier Inc.保留所有权利。

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