My Math Forum Evaporation from changing surface

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 November 17th, 2014, 04:44 AM #1 Newbie   Joined: Nov 2014 From: Slovakia Posts: 10 Thanks: 0 Evaporation from changing surface Hey boys and girls. I have folowing problem. I want to calculate mass of stream which is evaporating from surface, which is changing in time. Basic formula for this problem is: qs=OxSx(xs-x) [kg/s] where O is coeficient of evaporation S is evaporation surface xs is humidity ratio in satured air x is humidity ratio in the air I am filling vassel, which has shape like cone with cut off the top, with hot water. Inlet diameter of cone is 15mm and outlet diameter is 255mm. Flow rate is 300l/h. For better understanding of my problem, I attached following link: Evaporation from Water Surfaces How I can modify this furmula to solve my problem? Thank you very much.

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