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

Journal Article · · Physical Review Letters
 [1];  [2];  [3];  [2]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Univ. of Toronto, ON (Canada); none
  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)

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.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
FE0013999; SC0018357
OSTI ID:
1505591
Alternate ID(s):
OSTI ID: 1422435
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 8 Vol. 120; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (10)

Connectivity enhancement due to film flow in porous media journal September 2019
Triple line destabilization -- Tuning film thickness through meniscus curvature preprint January 2018
Wetting of an annular liquid in a capillary tube preprint January 2019
Dynamics of non-wetting drops confined in a Hele-Shaw cell journal April 2018
Forced dewetting in a capillary tube journal November 2018
Spin coating of capillary tubes journal January 2020
Enhanced imbibition from the cooperation between wetting and inertia via pulsatile forcing journal March 2019
Restoring universality to the pinch-off of a bubble journal June 2019
Comprehensive comparison of pore-scale models for multiphase flow in porous media journal June 2019
Quasistatic fluid-fluid displacement in porous media: Invasion-percolation through a wetting transition journal October 2018

Figures / Tables (4)


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