Wetting Kinetics of Polymer Solutions and Force-Based Contact Angles
The effect of the shear thinning behavior and elasticity of polymer solutions on the dynamic contact angles are investigated. Under dynamic conditions, the contact angle of a liquid on a solid surface changes significantly with the substrate velocity from its equilibrium value. The dynamic contact angles for polyethylene oxide (PEO) solutions of two molecular weights 3 x 105 and 4 x 106 have been measured using a polyethylene terephthalate (PET) plate. The three-parameter Ellis model to fit the rheological data to obtain shear thinning power n, characteristic shear stress, and the zero-shear viscosity is used. The theory indicates that dynamic contact angles follow power law in this instance instead of showing Newtonian behavior with zero-shear viscosity when the shear thinning effects are considered. The elastic effect becomes important at larger polymer concentrations that reduces the dependence on capillary number, that is, reduces n keeping with the experiments.
A. M. Al-Shareef et al., "Wetting Kinetics of Polymer Solutions and Force-Based Contact Angles," AIChE Journal, vol. 62, no. 7, pp. 2533 - 2541, American Institute of Chemical Engineers (AIChE), Jul 2016.
The definitive version is available at https://doi.org/10.1002/aic.15213
Chemical and Biochemical Engineering
Geosciences and Geological and Petroleum Engineering
Keywords and Phrases
Contact Angle; Non Newtonian Flow; Plastic Bottles; Polyethylene Oxides; Rheology; Rolling Resistance; Shear Stress; Shear Thinning; Shear Viscosity; Surface Chemistry; Wetting; Dynamic Contact Angle; Polyethylene Oxide (PEO); Polyethylene Terephthalates (PET); Polymer Concentrations; Shear Thinning Effect; Shear-Thinning Behavior; Zero Shear Viscosity; Shear Flow; Surface Chemistry/Physics; Transport
International Standard Serial Number (ISSN)
Article - Journal
© 2016 American Institute of Chemical Engineers (AIChE), All rights reserved.
01 Jul 2016