Oil droplet behavior at a pore entrance in the presence of crossflow: Implications for microfiltration of oil-water dispersions
Oil droplet behavior at a pore entrance in the presence of crossflow: Implications for microfiltration of oil-water dispersions
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DOI：
10.1016/j.memsci.2013.07.029
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发表时间：
2013-11-15
影响因子：
9.5
通讯作者：
Priezjev, Nikolai V.
中科院分区：
文献类型：
--
作者：
Darvishzadeh, Tohid;Tarabara, Volodymyr V.;Priezjev, Nikolai V.
通过求解Navier-Stokes方程，数值研究了钉扎在喷嘴入口处的油滴在横流诱导剪切作用下的行为。我们发现，在交叉流的情况下，临界跨膜压力所需的迫使液滴进入孔是在良好的协议与理论预测的基础上的杨-拉普拉斯方程。随着剪切速率的增加，渗透的临界压力增加，并且在足够高的剪切速率下，油滴破碎成两段。数值模拟的结果表明，在孔隙入口处的液滴破碎的表面张力系数的值较低，较高的油水粘度比和较大的液滴尺寸，但不敏感的接触角的值。使用简单的力和扭矩平衡参数，估计增加临界压力，由于横流和破碎毛细管数得到和验证不同的粘度比，表面张力系数，接触角，和滴孔径比。由爱思唯尔公司出版
The behavior of an oil droplet pinned at the entrance of a micropore and subject to crossflow-induced shear is investigated numerically by solving the Navier-Stokes equation. We found that in the absence of crosstlow, the critical transmembrane pressure required to force the droplet into the pore is in excellent agreement with a theoretical prediction based on the Young-Laplace equation. With increasing shear rate, the critical pressure of permeation increases, and at sufficiently high shear rates the oil droplet breaks up into two segments. The results of numerical simulations indicate that droplet breakup at the pore entrance is facilitated at lower values of the surface tension coefficient, higher oil-to-water viscosity ratio and larger droplet size but is insensitive to the value of the contact angle. Using simple force and torque balance arguments, an estimate for the increase in critical pressure due to crossflow and the breakup capillary number is obtained and validated for different viscosity ratios, surface tension coefficients, contact angles, and drop-to-pore size ratios. Published by Elsevier B.V.