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Title: Wettability and capillary effects: Dynamics of pinch-off in unconstricted straight capillary tubes

Abstract

We study the interfacial evolution of immiscible two-phase flow within a capillary tube in the partial wetting regime using direct numerical simulation. We investigate the flow patterns resulting from the displacement of a more viscous fluid by a less viscous one under a wide range of wettability conditions. We find that beyond a wettability dependent critical capillary number, a uniform displacement by a less viscous fluid can transition into a growing finger that eventually breaks up into discrete blobs by a series of pinch-off events for both wetting and non-wetting contact angles. This study validates previous experimental observations of pinch-off for wetting contact angles and extends those to non-wetting contact angles. We find that the blob length increases with the capillary number. We observe that the time between consecutive pinch-off events decreases with the capillary number and is greater for more wetting conditions in the displaced phase. Here, we further show that the blob separation distance as a function of the difference between the inlet velocity and the contact line speed collapses into two monotonically decreasing curves for wetting and non-wetting contact angles. For the phase separation in the form of pinch-off, this work provides a quantitative study of themore » emerging length and time scales and their dependence on the wettability conditions, capillary effects, and viscous forces.« less

Authors:
ORCiD logo [1];  [1];  [2];  [1]
  1. Stanford Univ., CA (United States)
  2. Univ. of Maryland, College Park, MD (United States)
Publication Date:
Research Org.:
Stanford Univ., CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1760009
Grant/Contract Number:  
SC0019165
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 102; Journal Issue: 2; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; Porous media; immiscible two-phase flow; wettability; pinch-off; displacement of immiscible fluids; microfluidics; wetting; microfluidic devices; multiphase flows; Navier-Stokes equation

Citation Formats

Esmaeilzadeh, Soheil, Qin, Zhipeng, Riaz, Amir, and Tchelepi, Hamdi A. Wettability and capillary effects: Dynamics of pinch-off in unconstricted straight capillary tubes. United States: N. p., 2020. Web. doi:10.1103/physreve.102.023109.
Esmaeilzadeh, Soheil, Qin, Zhipeng, Riaz, Amir, & Tchelepi, Hamdi A. Wettability and capillary effects: Dynamics of pinch-off in unconstricted straight capillary tubes. United States. https://doi.org/10.1103/physreve.102.023109
Esmaeilzadeh, Soheil, Qin, Zhipeng, Riaz, Amir, and Tchelepi, Hamdi A. Wed . "Wettability and capillary effects: Dynamics of pinch-off in unconstricted straight capillary tubes". United States. https://doi.org/10.1103/physreve.102.023109. https://www.osti.gov/servlets/purl/1760009.
@article{osti_1760009,
title = {Wettability and capillary effects: Dynamics of pinch-off in unconstricted straight capillary tubes},
author = {Esmaeilzadeh, Soheil and Qin, Zhipeng and Riaz, Amir and Tchelepi, Hamdi A.},
abstractNote = {We study the interfacial evolution of immiscible two-phase flow within a capillary tube in the partial wetting regime using direct numerical simulation. We investigate the flow patterns resulting from the displacement of a more viscous fluid by a less viscous one under a wide range of wettability conditions. We find that beyond a wettability dependent critical capillary number, a uniform displacement by a less viscous fluid can transition into a growing finger that eventually breaks up into discrete blobs by a series of pinch-off events for both wetting and non-wetting contact angles. This study validates previous experimental observations of pinch-off for wetting contact angles and extends those to non-wetting contact angles. We find that the blob length increases with the capillary number. We observe that the time between consecutive pinch-off events decreases with the capillary number and is greater for more wetting conditions in the displaced phase. Here, we further show that the blob separation distance as a function of the difference between the inlet velocity and the contact line speed collapses into two monotonically decreasing curves for wetting and non-wetting contact angles. For the phase separation in the form of pinch-off, this work provides a quantitative study of the emerging length and time scales and their dependence on the wettability conditions, capillary effects, and viscous forces.},
doi = {10.1103/physreve.102.023109},
journal = {Physical Review E},
number = 2,
volume = 102,
place = {United States},
year = {Wed Aug 12 00:00:00 EDT 2020},
month = {Wed Aug 12 00:00:00 EDT 2020}
}

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