Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as

Related MCQs

• The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are same for, NPr = NSc = __________
• Mass transfer co-efficient 'K' according to penetration theory varies with mass diffusivity as
• Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)
• If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is
• Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as
• The diffusivity, DAB (for component A diffusing in B) is equal to the diffusivity DBA (for component B diffusing in A) for a binary mixture of
• The mass transfer co-efficient for a solid sphere of radius 'a' dissolving in a large volume of quiescent liquid, in which „D’ is the diffusivity of solute, is
• H2S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H2S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in metres) corresponding to an operating line given by, y = 5x + 0.001 is
• For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is
• JD factor for mass transfer is a function of Reynolds number. Mass transfer by molecular diffusion from a single drop to surrounding still air is given by