Abstract

Thin liquid films formed near dry spots make a big contribution to heat and mass transfer processes due to intensive evaporation. Based on the solution to the problem of determining the shape of the film free boundary in a vicinity of a stationary dry spot formed by gravitational and capillary forces at a given contact angle, a criterion for the development (or shrinkage) of a dry spot in an isothermal liquid film on a horizontal flat substrate was derived without using additional assumptions and postulating the film shape near the spot.

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