Talk:Falling film evaporator

The tube side heat transfer coefficient is determined by the hydrodynamic flow conditions of the film. For low massflows or high viscosities the film can be found of laminar type. Heat transfer is controlled purely by conduction through the film. Therefore in this condition heat transfer decreases with increased mass flow. With increased mass flow the film becomes wavy laminar and with further increased flow turbulent. Under this conditions the heat transfer increases with increased flow.

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I was confused by this statement too, but I think it means that an increase in flowrate during the laminar flow regime will lower heat transfer until turbulence takes over. -137.122.50.104 (talk) 22:53, 16 November 2008 (UTC)