Regime Map and Triple Point in Selective Withdrawal.

Publication Year
2020

Type

Journal Article
Abstract

Entrainment in selective withdrawal occurs when both the top and bottom phases are withdrawn through a capillary tube oriented perpendicular to a flat gravitationally separated liquid-liquid interface. The tube introduces two distinct features to the conditions for fluid entrainment. First, the ratio of the two phases being withdrawn is affected by the region of influence of the flow upstream of the tube's orifice. Second, a minimum withdrawal flow rate must be reached for entrainment regardless of the distance between the interface and the tube. We show that these phenomena can be understood based on the Reynolds number that governs the external flow field around the capillary tube and the capillary number that regulates the effect of the viscosity and capillarity.

Journal
Phys Rev Lett
Volume
125
Issue
26
Pages
264502
Date Published
2020 Dec 31
ISSN Number
1079-7114
Alternate Journal
Phys Rev Lett
PMID
33449773