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Influence of operating conditions and liquid phase viscosity with volume of fluid method on bubble formation process

机译:作用条件与液相粘度对泡沫形成过程中流体法量的影响

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In this paper, a numerical study of air bubble formation and detachment in water (S-1) and in glycerin solutions (S-2 and S-3) was investigated using the volume of fluid (VOF) method. The full formation process was studied under the effect of operating conditions such as wettability of the orifice plate (static contact angle theta(s)), orifice diameter and orifice air velocity. In addition, the influence of the viscosity of the liquid phase was examined. The numerical simulations were carried out for different orifice velocities satisfying the quasi-static bubble growth condition at low Capillary and Bond numbers. Under such conditions, the surface tension effect is dominant over viscous drag and buoyancy effects. The bubble growth at different instants predicted by the VOF simulation was experimentally validated in water. During the expansion/elongation stage significant bubble shape oscillations have been observed by the simulation. In water, bubble shape is mainly dominated by inertial and surface tension forces, and the influence caused by the viscous drag force could be neglected. However, when the viscosity of the solution increases, the bubble shape oscillations can be reduced due to the effect of viscous drag force. (C) 2017 Elsevier Masson SAS. All rights reserved.
机译:本文采用流体(VOF)法量研究了水(S-1)和水(S-1)和甘油溶液中的气泡形成和脱离的数值研究。在诸如孔板的润湿性(静态接触角θ),孔口直径和孔口空气速度的操作条件下进行全部形成过程。另外,检查液相粘度的影响。在低毛细管和粘合数下满足拟静态泡生长条件的不同孔速度进行数值模拟。在这种条件下,表面张力效应占粘性阻力和浮力效应。通过VOF模拟预测的不同瞬间的泡沫生长在水中进行了实验验证。在膨胀/伸长阶段期间,通过模拟已经观察到显着的气泡形状振荡。在水中,气泡形状主要由惯性和表面张力支配,并且可以忽略由粘性阻力造成的影响。然而,当溶液的粘度增加时,由于粘性阻力的效果,气泡形状振荡可以减少。 (c)2017年Elsevier Masson SAS。版权所有。

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