An experimental study on dynamic pore wettability

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

Research output: Contribution to journalArticle

20 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 languageEnglish
Pages (from-to)988-997
Number of pages10
JournalChemical Engineering Science
Volume104
Early online date29 Oct 2013
DOIs
Publication statusPublished - 18 Dec 2013

Fingerprint

Wetting
Contact angle
Liquids
Surface tension
1-Propanol
Propanol
Contacts (fluid mechanics)
Nanofluidics
Silicone Oils
Viscosity of liquids
Deionized water
Petroleum
Silicones
Porous materials
Groundwater
Oils
Crude oil
Viscosity
Adsorption
Recovery

Keywords

  • Dynamic wetting
  • Pore wettability
  • Imbibition dynamics
  • Surface tension
  • Viscosity

Cite this

Li, X., Fan, X., Askounis, A., Wu, K., Sefiane, K., & Koutsos, V. (2013). An experimental study on dynamic pore wettability. Chemical Engineering Science, 104, 988-997. https://doi.org/10.1016/j.ces.2013.10.026

An experimental study on dynamic pore wettability. / Li, Xingxun; Fan, Xianfeng; Askounis, Alexandros; Wu, Kejian; Sefiane, Khellil; Koutsos, Vasileios.

In: Chemical Engineering Science, Vol. 104, 18.12.2013, p. 988-997.

Research output: Contribution to journalArticle

Li, X, Fan, X, Askounis, A, Wu, K, Sefiane, K & Koutsos, V 2013, 'An experimental study on dynamic pore wettability', Chemical Engineering Science, vol. 104, pp. 988-997. https://doi.org/10.1016/j.ces.2013.10.026
Li, Xingxun ; Fan, Xianfeng ; Askounis, Alexandros ; Wu, Kejian ; Sefiane, Khellil ; Koutsos, Vasileios. / An experimental study on dynamic pore wettability. In: Chemical Engineering Science. 2013 ; Vol. 104. pp. 988-997.
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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.

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