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# Please help with Question 4 *with explanation of your steps* because I don't understand how my le...

Please help with Question 4 *with explanation of your steps* because I don't understand how my lecturer did it(provided). Please write legibly

Please do (a,b and c) even though I provided (a)

4. Water is evaporating in 2-inch diameter wetted-wall column at Reynolds number of 10, 000 and a temperature of 313 K. Take the molar volume of air at stp to be 22 410 cm3/ mol and the viscosity (H) as 0.0186 Cp, and diffusivity of water into air as 1040 cm'h. Additional information for the relevant dimensionless parameters are: (a) Calculate the thickness of the gas film [0.064 inches] (b) What would the film thickness be if water was substituted with a different liquid for which the diffusivity is 0.145 cm'/s [0.047 inches] (c) Explain the variation of the film thickness with the mass transfer coefficient
22 .4Ho 0.288 o 8 2

we can see that film thickness decreases as diffusivity decreases ,

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