Evaporating menisci of wetting fluids

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Abstract

We model the transport processes occurring in a horizontal evaporating meniscus which is affected by both capillarity and by multilayer adsorption. Perturbation theory is used to describe the profile change relative to the static isothermal profile. We solve for this deviation profile, as well as for the evaporative flux from the interface, for a range of values appropriate to the nondimensional parameters in the model. The results clearly demonstrate that large heat fluxes can occur in the transition region between the capillary meniscus and the adsorbed layer. Moreover, the deviation profile predicts a thinning in the meniscus region with a shift in the apparent zero toward the gap, a much thinner nonevaporating adsorbed film, and an increase in apparent contact angle.

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