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.
- 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
Available at: http://works.bepress.com/partho-neogi/82/