Condensation of a Non-Wetting Fluid on a Solid Surface
Theoretical studies of a drop moving under condensation from the surrounding vapor, have been provided. Two cases are considered. In the first, the rate of condensation is large that the drop “moves” because condensation has changed its dimensions. The model provided here shows that the rate of spreading is a constant, proportional to the heat flux and inversely proportional to the macroscopic contact angle. This compares well with available experimental data. The other model where the rate of condensation is small, is taken from existing results and comes close to explaining one set of experimental data. It is based on the use of viscous forces as the primary rate mechanism. Its shortcomings have been discussed.
P. Neogi, "Condensation of a Non-Wetting Fluid on a Solid Surface," Journal of Colloid and Interface Science, Elsevier, Dec 2007.
The definitive version is available at http://dx.doi.org/10.1016/j.jcis.2007.08.066
Chemical and Biochemical Engineering
Keywords and Phrases
Condensation; Spreading Rate; Thin Liquid Films
Article - Journal
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