If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is

Related MCQs

• The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are same for, NPr = NSc = __________
• 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
• Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of
• Mass transfer co-efficient 'K' according to penetration theory varies with mass diffusivity as
• Schmidt number and Lewis number for pure air at atmospheric conditions are respectively
• Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)
• In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raffinate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg)
• Lewis number (Le) is
• The value of Lewis number (Le = Sc/Pr) for air-water vapour system is around
• For which of the following unit operations, Lewis number is of significance?