Lattice Boltzmann simulation of immiscible displacement in the cavity with different channel configurations
Lattice Boltzmann simulation of immiscible displacement in the cavity with different channel configurations
复制标题
不同通道结构腔内不混溶位移的格子玻尔兹曼模拟
DOI：
10.1142/s0129183117501364
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发表时间：
2017-12
影响因子：
1.9
通讯作者：
Xutao Xu
中科院分区：
文献类型：
--
作者：
Qin Lou;Chenqiang Zang;Mo Yang;Xutao Xu
本文采用改进的赝势格子Boltzmann方程（LBE）模型，研究了不同通道结构腔体中的非混溶位移。该模型克服了原赝势LBE模型中流体性质依赖于网格大小的缺点。该方法首先通过拉普拉斯定律进行验证。然后，将其应用于非混相驱替过程的研究。研究了表面润湿性、气液腔间距以及通道表面粗糙度等因素对流动的影响。数值结果表明，随着表面接触角的增大，驱替效率增大，驱替时间缩短。另一方面，驱替效率随着气液腔间距的增大先增大后趋于恒定。对于表面粗糙度，研究了两种结构（半圆形空腔和半圆形凸起）。综合结果表明，虽然这两种结构的驱替过程依赖于表面润湿性，但它们呈现出截然不同的行为。特别是对于由半圆形空腔构成的粗糙结构，当接触角较小时，随着半圆形空腔尺寸的增大，置换效率明显降低，置换时间明显增加。随着接触角的增大，这种趋势减缓.当接触角超过一定值时，半圆孔的大小对位移过程几乎没有影响。而对于半圆形凸起的粗糙结构，随着凸起尺寸的增大，置换效率先增大后减小。当接触角较大时，驱油效率先增大后趋于恒定。结果还表明，在这些情况下的小接触角的位移时间有一个极值。
In this work, the immiscible displacement in a cavity with different channel configurations is studied using an improved pseudo-potential lattice Boltzmann equation (LBE) model. This model overcomes the drawback of the dependence of the fluid properties on the grid size, which exists in the original pseudo-potential LBE model. The approach is first validated by the Laplace law. Then, it is employed to study the immiscible displacement process. The influences of different factors, such as the surface wettability, the distance between the gas cavity and liquid cavity and the surface roughness of the channel are investigated. Numerical results show that the displacement efficiency increases and the displacement time decreases with the increase of the surface contact angle. On the other hand, the displacement efficiency increases with increasing distance between the gas cavity and the liquid cavity at first and finally reaches a constant value. As for the surface roughness, two structures (a semicircular cavity and a semicircular bulge) are studied. The comprehensive results show that although the displacement processes for both the structures depend on the surface wettability, they present quite different behaviors. Specially, for the roughness structure constituted by the semicircular cavity, the displacement efficiency decreases and displacement time increases evidently with the size of the semicircular cavity for the small contact angle. The trend slows down as the increase of the contact angle. Once the contact angle exceeds a certain value, the size of the semicircular cavity almost has no influence on the displacement process. While for the roughness structure of a semicircular bulge, the displacement efficiency increases with the size of bulge first and then it decreases for the small contact angle. The displacement efficiency increases first and finally reaches a constant for the large contact angle. The results also show that the displacement time has an extreme value in these cases for the small contact angles.
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影响因子：
2.9
作者：
GUNSTENSEN, AK;ROTHMAN, DH;ZANETTI, G
通讯作者：
ZANETTI, G
影响因子：
9.2
作者：
Xun Zhu;P. Sui;N. Djilali
通讯作者：
Xun Zhu;P. Sui;N. Djilali
影响因子：
2.8
作者：
Kang Yang;Zhaoli Guo
通讯作者：
Kang Yang;Zhaoli Guo
DOI：
10.1039/c4cp03910f
发表时间：
2014-10
期刊：
Physical chemistry chemical physics : PCCP
影响因子：
--
作者：
Die Yang;M. Krasowska;Craig Priest;John Ralston
通讯作者：
Die Yang;M. Krasowska;Craig Priest;John Ralston
影响因子：
6.3
作者：
Raoyang Zhang;Xiaoyi He;Shiyi Chen
通讯作者：
Raoyang Zhang;Xiaoyi He;Shiyi Chen