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Title: Forced Wetting Transition and Bubble Pinch-Off in a Capillary Tube

Abstract

Immiscible fluid-fluid displacement in partial wetting continues to challenge our microscopic and macroscopic descriptions. In this study, we investigate the displacement of a viscous fluid by a less viscous fluid in a circular capillary tube in the partial wetting regime. In contrast with the classic results for complete wetting, we show that the presence of a moving contact line induces a wetting transition at a critical capillary number that is contact angle dependent. At small displacement rates, the fluid-fluid interface deforms slightly from its equilibrium state and moves downstream at a constant velocity, without changing its shape. As the displacement rate increases, however, a wetting transition occurs: the interface becomes unstable and forms a finger that advances along the axis of the tube, leaving the contact line behind, separated from the meniscus by a macroscopic film of the viscous fluid on the tube wall. We detail the dewetting of the entrained film, and show that it universally leads to bubble pinch-off, therefore demonstrating that the hydrodynamics of contact line motion generate bubbles in microfluidic devices, even in the absence of geometric constraints.

Authors:
 [1];  [2];  [3];  [2]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Univ. of Toronto, ON (Canada)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Technical Univ. of Madrid, Madrid (Spain)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1505591
Alternate Identifier(s):
OSTI ID: 1422435
Grant/Contract Number:  
FE0013999; SC0018357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 120; Journal Issue: 8; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE

Citation Formats

Zhao, Benzhong, Alizadeh Pahlavan, Amir, Cueto-Felgueroso, Luis, and Juanes, Ruben. Forced Wetting Transition and Bubble Pinch-Off in a Capillary Tube. United States: N. p., 2018. Web. doi:10.1103/physrevlett.120.084501.
Zhao, Benzhong, Alizadeh Pahlavan, Amir, Cueto-Felgueroso, Luis, & Juanes, Ruben. Forced Wetting Transition and Bubble Pinch-Off in a Capillary Tube. United States. doi:10.1103/physrevlett.120.084501.
Zhao, Benzhong, Alizadeh Pahlavan, Amir, Cueto-Felgueroso, Luis, and Juanes, Ruben. Fri . "Forced Wetting Transition and Bubble Pinch-Off in a Capillary Tube". United States. doi:10.1103/physrevlett.120.084501. https://www.osti.gov/servlets/purl/1505591.
@article{osti_1505591,
title = {Forced Wetting Transition and Bubble Pinch-Off in a Capillary Tube},
author = {Zhao, Benzhong and Alizadeh Pahlavan, Amir and Cueto-Felgueroso, Luis and Juanes, Ruben},
abstractNote = {Immiscible fluid-fluid displacement in partial wetting continues to challenge our microscopic and macroscopic descriptions. In this study, we investigate the displacement of a viscous fluid by a less viscous fluid in a circular capillary tube in the partial wetting regime. In contrast with the classic results for complete wetting, we show that the presence of a moving contact line induces a wetting transition at a critical capillary number that is contact angle dependent. At small displacement rates, the fluid-fluid interface deforms slightly from its equilibrium state and moves downstream at a constant velocity, without changing its shape. As the displacement rate increases, however, a wetting transition occurs: the interface becomes unstable and forms a finger that advances along the axis of the tube, leaving the contact line behind, separated from the meniscus by a macroscopic film of the viscous fluid on the tube wall. We detail the dewetting of the entrained film, and show that it universally leads to bubble pinch-off, therefore demonstrating that the hydrodynamics of contact line motion generate bubbles in microfluidic devices, even in the absence of geometric constraints.},
doi = {10.1103/physrevlett.120.084501},
journal = {Physical Review Letters},
number = 8,
volume = 120,
place = {United States},
year = {2018},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 4 works
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Figures / Tables:

FIG. 1 FIG. 1: Fluid-fluid interface of air (black) displacing glycerol (white) under increasing capillary numbers (top to bottom) in a wetting capillary tube with θeq = 25°± 5° (left column) and a weakly wetting capillary tube with θeq = 68°± 5° (right column). The orange arrows indicate the direction of interfacemore » displacement. At small Ca, the meniscus deforms slightly from its equilibrium shape, but remains as a spherical cap. At large Ca, however, a wetting transition occurs and the invading air forms a single finger that advances along the center of the tube, leaving a macroscopic trailing film of the viscous liquid on the tube walls. The critical capillary number Ca* at which film formation occurs is controlled by the wettability [pane (r) versus pane (e)].« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.