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

Related MCQs

• The relation among various mass transfer co-efficients (M.T.C) for ideal gases is given by (where, Kc & Km are M.T.C. for equimolar counter diffusion with concentration & mole fraction respectively as the driving force. and, Kp= M.T.C. for diffusion of a gas through a stagnant inert gas with pressure as driving force.)
• For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as
• The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same system is.
• Ordinary diffusion process is also called __________ diffusion.
• The value of NA/(NA + NB) for steady state molecular diffusion of gas 'A' through nondiffusing gas 'B' is
• Component A is diffusing in a medium B. The flux NA relative to a stationary point is equal to the flux due to molecular diffusion, if
• Molecular diffusion is caused by the
• 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
• Corresponding to Nusselt number in heat transfer, the dimensionless group in mass transfer is the __________ number.
• Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the __________ number.