Mass Transfer

For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG: mass transfer co-efficient, moles/m2, a: interfacial area per unit volume of tower) ?

A. G/(FG . a)
B. FG/(G . a)
C. (G . a)/FG
D. L/(FG . G)

A. Higher contact area
B. Better contact of the phase
C. Repeated coalescence & redispersion of the drop phase
D. None of these

A. Fick’s second law of diffusion
B. Steady state diffusion for stagnant case
C. Liquid M.T.C. by Higbie penetration theory
D. None of these

A. Increase
B. Decrease
C. Remain unaffected
D. Decrease or increase; depends on the type of liquid

A. Methyl ethyl ketone
B. Water
C. Carbon tetrachloride
D. Carbon dioxide

A. log P vs. T
B. log P vs. log T
C. T vs. P
D. P vs. log T

A. D/a
B. D/2a
C. Proportional to √D
D. Dependent on the Reynolds number

A. Decreases with increase in
B. Increases with increase in
C. Is independent of
D. None of these

A. Gilliland
B. Hirschfelder
C. Wilke and Chang
D. None of these

A. Mixture of two gases
B. Pure gas
C. Ideal gas
D. Sparingly soluble gas