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Water is evaporating from a pool exposed to a breeze of ambient air at 3 0 0 K , 1 . 0 1 3 2
Water is evaporating from a pool exposed to a breeze of ambient air at K bar, and relative humidity. Assuming that mass transfer is due to molecular diffusion through a stagnant film of air of mm determine the following
A the diffusivity of water in air using Hirschfeldre's equation
B The model to evaluate the rate of evaporation of water
C the initial rate of evaporation of water as a molar flux in KmolCmS
D The time in hours for the water level to drop cm
Given:
Mair gmol;
Water vapor pressure @K kPa
Collision diameter air Anstrong
Collision diameter water Anstrong
EK air K
EK water K
Dens. water gcm
atm bar kPa
R kPa mkmolK
Hint Relative humidity is the ratio of the partial Pressure of water to the equilibrium vapor pressure at the same temperature the answer
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