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Water is evaporating from the placid surface of a lake and the vapour(A) diffuses through a stagnant film of air(B) of estimated thickness 3 mm. The water temperature is 23°C and the air temperature is 27°C. The relative humidity of air is 65%. If the diffusivity of water vapour through air is 0.257 cm²/s at 23°C and 0.262 cm²/s at 27°C, calculate the rate of evaporation. The vapour pressure of water can be calculated using the Antoine equation, Pv (in bar), of water is given by: In Pv = 13.8573 - 5160.2/T where T is the temperature in K.

Water is evaporating from the placid surface of a lake and the vapour(A) diffuses through a stagnant film of air(B) of estimated thickness 3 mm. The water temperature is 23°C and the air temperature is 27°C. The relative humidity of air is 65%. If the diffusivity of water vapour through air is 0.257 cm²/s at 23°C and 0.262 cm²/s at 27°C, calculate the rate of evaporation. The vapour pressure of water can be calculated using the Antoine equation, Pv (in bar), of water is given by: In Pv = 13.8573 - 5160.2/T where T is the temperature in K.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Water is evaporating from the placid surface of a lake and the vapour(A) diffuses through a stagnant film of air(B) of estimated thickness 3 mm. The water temperature is 23°C and the air temperature is 27°C. The relative humidity of air is 65%. If the diffusivity of water vapour through air is 0.257 cm² /s at 23°C and 0.262 cm²/s at 27°C, calculate the rate of evaporation. The vapour pressure of water can be calculated using the Antoine equation, Pv (in bar), of water is given by: In PV = 13.8573 - 5160.2/T where T is the temperature in K.
Transcribed Image Text:Water is evaporating from the placid surface of a lake and the vapour(A) diffuses through a stagnant film of air(B) of estimated thickness 3 mm. The water temperature is 23°C and the air temperature is 27°C. The relative humidity of air is 65%. If the diffusivity of water vapour through air is 0.257 cm² /s at 23°C and 0.262 cm²/s at 27°C, calculate the rate of evaporation. The vapour pressure of water can be calculated using the Antoine equation, Pv (in bar), of water is given by: In PV = 13.8573 - 5160.2/T where T is the temperature in K.
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