Measurement of the drift of a droplet due to the presence of a plane
Measurement of the drift of a droplet due to the presence of a plane
复制标题
由于平面的存在而导致的液滴漂移的测量
DOI：
10.1063/1.857856
复制
发表时间：
1991
影响因子：
4.6
通讯作者：
D. Leighton
中科院分区：
文献类型：
--
作者：
J. R. Smart;D. Leighton
研究了 Couette 装置中低粘度可变形液滴（粘度比 λ=0.08）的漂移。漂移在剪切平面（由于 Couette 装置的刚性外边界壁）和垂直于剪切平面（由于上边界无应力表面）中测量。从理论上描述了任意剪切流中液滴变形引起的法向应力与垂直于刚性无应力平面的前导漂移之间的一般关系。这种关系与先前对剪切流中液滴迁移的理论预测一致，并用于将漂移测量实验的结果与一阶变形理论进行比较。测量的漂移速度与 Schowalter 等人的理论相当一致。 [J。胶体界面科学。 26, 152 (1968)]。
The drift of a deformable droplet of low viscosity (viscosity ratio λ=0.08) in a Couette device is examined. The drift is measured both in the plane of shear (due to the rigid outer bounding walls of the Couette device) and also normal to the plane of shear (due to the upper bounding stress‐free surface). A general relationship between normal stresses induced by the deformation of a droplet in an arbitrary shear flow and the leading‐order drift normal to rigid and stress‐free plane surfaces is described theoretically. This relationship is consistent with previous theoretical predictions for droplet migration in shear flows, and is used to compare results from the drift measurement experiments with first‐order deformation theories. The measured drift velocities are in reasonable agreement with the theory of Schowalter et al. [J. Colloid Interface Sci. 26, 152 (1968)].