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November 17th, 2014, 04:44 AM   #1
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Question 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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