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Evaporation processes generally occur from liquid films, drops, and jets. Films may flow on a heated or adiabatic surface as a result of gravity or vapor shear. Drops may evaporate from a heated substrate, or they may be suspended in a gas mixture or immiscible fluid. Jets may be cylindrical in shape or elongated (ribbon-like).

Classification and Criteria of Evaporation.
Adiabatic walls, and heated wall.
Liquid droplet in a hot gas and liquid jet in a pure vapor.

, microchalnnels, wedge or cone in porous medium, and inverted meniscus in porous media.

horizontal plate, falling film, direct contact, pores and microchannels, and porous media.