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Falling liquid films on inclined plates and on vertical walls have manyapplications to heat and mass transfer equipment. These transfer rates are greatly influenced by the surface behavior of falling liquid films. Films on vertical walls have a "calming zone" without wavemotion for a short distance below the liquid distributor6'8"11^On the other hand, the

Falling liquid films on inclined plates have been experimentally studied with special attention to the "calming zone", where the surface is mirror-like in the range of Re from 2500 to 6000.Velocity profile by the hydrogen bubble method and film thickness by the pointer and gauge method were measured, and the film surface behavior was observed by laser beam reflection. Film flow in the calming zone is laminar with air drag at the air-liquid interface.

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