An experimental study on dynamic pore wettability

Xingxun Li; Xianfeng Fan; Alexandros Askounis; Kejian Wu; Khellil Sefiane; Vasileios Koutsos

doi:10.1016/j.ces.2013.10.026

An experimental study on dynamic pore wettability

Xingxun Li, Xianfeng Fan, Alexandros Askounis, Kejian Wu, Khellil Sefiane, Vasileios Koutsos

Engineering

Research output: Contribution to journal › Article › peer-review

49 Citations (Scopus)

Abstract

Dynamic pore wettability is important for understanding fluid behavior and adsorption in porous media for enhanced oil recovery, groundwater movements, nanofluidics and nanolubrication. Although dynamic wetting of different liquids has been extensively studied on various plane substrates, dynamic wettability in small pores has not been systematically investigated. In this paper, we measured dynamic contact angles in single glass capillaries with a size range from 100 to 250 μm, in order to investigate the relationship between dynamic contact angle and spontaneous imbibition of various liquids, the effects of surface tension and viscosity of liquids on dynamic contact angle, and the dependence of contact angle on contact-line velocity in a pore. The liquids used are silicone oils with various viscosities, deionized water, 1-propanol, n-decane, crude oil, propanol-water mixtures with various surface tensions. The results indicate that the dynamic contact angle of liquids in a pore increases monotonically with the contact-line velocity at low capillary numbers, and this increase becomes more significant when more viscous liquids or liquids with lower surface tensions are used. A new empirical correlation based on the obtained experimental data has been proposed to describe dynamic pore wettability in a low capillary number range (1.0×10−7<Ca<1.8×10−5). Finally, we show that all our results can be summarized by a master curve relating the contact angle variation at a specific velocity with the Crispation number (Cr) signifying the importance of the interfacial deformation of liquid in a pore.

Original language	English
Pages (from-to)	988-997
Number of pages	10
Journal	Chemical Engineering Science
Volume	104
Early online date	29 Oct 2013
DOIs	https://doi.org/10.1016/j.ces.2013.10.026
Publication status	Published - 18 Dec 2013

Bibliographical note

This work is supported by the Carnegie Scholarship, UK, University of Edinburgh Research Scholarship, the Research Grant from the UK Royal Society (e-gap) and the Royal Academy of Engineering for research exchange scheme. We also would like to thank the technique support from Mr. Gardiner Hill, the Director of Technology at BP, Dr. Stephen J. Cawley at BP, and Dr. Jinhai Yang and Heron from the Heriot-Watt University, and thank Mr. Stephen Mitchell in School of Biological Sciences of The University of Edinburgh for SEM measurements.

Keywords

Dynamic wetting
Pore wettability
Imbibition dynamics
Surface tension
Viscosity

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title = "An experimental study on dynamic pore wettability",

abstract = "Dynamic pore wettability is important for understanding fluid behavior and adsorption in porous media for enhanced oil recovery, groundwater movements, nanofluidics and nanolubrication. Although dynamic wetting of different liquids has been extensively studied on various plane substrates, dynamic wettability in small pores has not been systematically investigated. In this paper, we measured dynamic contact angles in single glass capillaries with a size range from 100 to 250 μm, in order to investigate the relationship between dynamic contact angle and spontaneous imbibition of various liquids, the effects of surface tension and viscosity of liquids on dynamic contact angle, and the dependence of contact angle on contact-line velocity in a pore. The liquids used are silicone oils with various viscosities, deionized water, 1-propanol, n-decane, crude oil, propanol-water mixtures with various surface tensions. The results indicate that the dynamic contact angle of liquids in a pore increases monotonically with the contact-line velocity at low capillary numbers, and this increase becomes more significant when more viscous liquids or liquids with lower surface tensions are used. A new empirical correlation based on the obtained experimental data has been proposed to describe dynamic pore wettability in a low capillary number range (1.0×10−7<Ca<1.8×10−5). Finally, we show that all our results can be summarized by a master curve relating the contact angle variation at a specific velocity with the Crispation number (Cr) signifying the importance of the interfacial deformation of liquid in a pore.",

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author = "Xingxun Li and Xianfeng Fan and Alexandros Askounis and Kejian Wu and Khellil Sefiane and Vasileios Koutsos",

note = "This work is supported by the Carnegie Scholarship, UK, University of Edinburgh Research Scholarship, the Research Grant from the UK Royal Society (e-gap) and the Royal Academy of Engineering for research exchange scheme. We also would like to thank the technique support from Mr. Gardiner Hill, the Director of Technology at BP, Dr. Stephen J. Cawley at BP, and Dr. Jinhai Yang and Heron from the Heriot-Watt University, and thank Mr. Stephen Mitchell in School of Biological Sciences of The University of Edinburgh for SEM measurements.",

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AU - Askounis, Alexandros

AU - Wu, Kejian

AU - Sefiane, Khellil

AU - Koutsos, Vasileios

N1 - This work is supported by the Carnegie Scholarship, UK, University of Edinburgh Research Scholarship, the Research Grant from the UK Royal Society (e-gap) and the Royal Academy of Engineering for research exchange scheme. We also would like to thank the technique support from Mr. Gardiner Hill, the Director of Technology at BP, Dr. Stephen J. Cawley at BP, and Dr. Jinhai Yang and Heron from the Heriot-Watt University, and thank Mr. Stephen Mitchell in School of Biological Sciences of The University of Edinburgh for SEM measurements.

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N2 - Dynamic pore wettability is important for understanding fluid behavior and adsorption in porous media for enhanced oil recovery, groundwater movements, nanofluidics and nanolubrication. Although dynamic wetting of different liquids has been extensively studied on various plane substrates, dynamic wettability in small pores has not been systematically investigated. In this paper, we measured dynamic contact angles in single glass capillaries with a size range from 100 to 250 μm, in order to investigate the relationship between dynamic contact angle and spontaneous imbibition of various liquids, the effects of surface tension and viscosity of liquids on dynamic contact angle, and the dependence of contact angle on contact-line velocity in a pore. The liquids used are silicone oils with various viscosities, deionized water, 1-propanol, n-decane, crude oil, propanol-water mixtures with various surface tensions. The results indicate that the dynamic contact angle of liquids in a pore increases monotonically with the contact-line velocity at low capillary numbers, and this increase becomes more significant when more viscous liquids or liquids with lower surface tensions are used. A new empirical correlation based on the obtained experimental data has been proposed to describe dynamic pore wettability in a low capillary number range (1.0×10−7<Ca<1.8×10−5). Finally, we show that all our results can be summarized by a master curve relating the contact angle variation at a specific velocity with the Crispation number (Cr) signifying the importance of the interfacial deformation of liquid in a pore.

AB - Dynamic pore wettability is important for understanding fluid behavior and adsorption in porous media for enhanced oil recovery, groundwater movements, nanofluidics and nanolubrication. Although dynamic wetting of different liquids has been extensively studied on various plane substrates, dynamic wettability in small pores has not been systematically investigated. In this paper, we measured dynamic contact angles in single glass capillaries with a size range from 100 to 250 μm, in order to investigate the relationship between dynamic contact angle and spontaneous imbibition of various liquids, the effects of surface tension and viscosity of liquids on dynamic contact angle, and the dependence of contact angle on contact-line velocity in a pore. The liquids used are silicone oils with various viscosities, deionized water, 1-propanol, n-decane, crude oil, propanol-water mixtures with various surface tensions. The results indicate that the dynamic contact angle of liquids in a pore increases monotonically with the contact-line velocity at low capillary numbers, and this increase becomes more significant when more viscous liquids or liquids with lower surface tensions are used. A new empirical correlation based on the obtained experimental data has been proposed to describe dynamic pore wettability in a low capillary number range (1.0×10−7<Ca<1.8×10−5). Finally, we show that all our results can be summarized by a master curve relating the contact angle variation at a specific velocity with the Crispation number (Cr) signifying the importance of the interfacial deformation of liquid in a pore.

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KW - Pore wettability

KW - Imbibition dynamics

KW - Surface tension

KW - Viscosity

U2 - 10.1016/j.ces.2013.10.026

DO - 10.1016/j.ces.2013.10.026

M3 - Article

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VL - 104

SP - 988

EP - 997

JO - Chemical Engineering Science

JF - Chemical Engineering Science

ER -

An experimental study on dynamic pore wettability

Abstract

Bibliographical note

Keywords

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