Can a Dynamic Contact Angle be Understood in Terms of a Friction Coefficient?
The kinetics of capillary rise of pure water and ethanol as well as mixtures thereof that under static conditions wet glass capillaries has been studied by a high-speed imaging technique. To adequately describe the experimental data, a rate-dependent dynamic contact angle must be added to the Washburn-Lucas equation. This result is discussed in terms of a molecular friction coefficient at the front of the liquid flowing over the substrate. Dynamic inertia effects are significant at the initial...[Show more]
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|Source:||Journal of Colloid and Interface Science|
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