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Force-based dynamic contact angle measurements in liquid-liquid-solid systems.pdf
Journal of Petroleum Science and Engineering 147 (2016) 273–281
Contents lists available at ScienceDirect
Journal of Petroleum Science and Engineering
journal homepage: /locate/petrol
Force-based dynamic contact angle measurements in liquid-liquidsolid systems
Amer Al-Shareef a, P. Neogi a,n, Baojun Bai b
a Department of Chemical and Biochemical Engineering, United States b Department of Geological Science and Engineering, Missouri University of Science and Technology, Rolla, MO 65409-1203, United States
article info
Article history: Received 14 January 2016 Received in revised form 31 May 2016 Accepted 7 June 2016 Available online 8 June 2016
Keywords: Dynamic wetting Liquid-liquid systems Contact line instability Wettability
abstract
Under ?ow conditions, the dynamic contact angle replaces the equilibrium contact angle. Correlation of dynamic contact angles as a function of the capillary number in liquid-liquid-solid systems is important in a number of applications. For instance, it is one of the ways used to predict water penetration into an oil-?lled porous medium. The Cahn-Thermo device is used to measure the excess force needed to plunge a plate vertically into a liquid-liquid interface or pull it out. This force is used to calculate the dynamic contact angle. Polydimethylsiloxane (PDMS) with different viscosities were used for the upper phase and water for the lower phase (viscosity ratios of 95–485). An algebraic expression that predicts the dynamic contact angles has been derived using the concept that the total viscous dissipation is equal to the surface work in the contact line region. This result, together with a result based on a regular hydrodynamic theory, was compared to the experiments on the advancing dynamic contact angles. The advancing dynamic contact angles measured were from 90° to 105°, agreed with the theory and one adjustable parameter related to the ratio of microscopic to the macroscopic length scale that is recovered is found to depend i
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