Question

Find the gas phase mass transfer co-efficient for a unbound moisture to remove if the flux is 5 kg/sq.m sec and the difference in humidity of the liquid and the main stream is 0.5 units.

(a) 5

(b) 10

(c) 20

(d) 30

I had been asked this question by my school teacher while I was bunking the class.

My doubt is from Drying-Rate of  Batch Drying in section Drying of Mass Transfer

Answer 1

Correct option is (b) 10

For explanation I would say: Flux= Mass transfer co-efficient * (Ys-Y)

                         Mass transfer co-efficient= 5/0.5 = 10.