Lewis number (Le) is

Related MCQs

• Schmidt number and Lewis number for pure air at atmospheric conditions are respectively
• The value of Lewis number (Le = Sc/Pr) for air-water vapour system is around
• Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of
• If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is
• For which of the following unit operations, Lewis number is of significance?
• Corresponding to Nusselt number in heat transfer, the dimensionless group in mass transfer is the __________ number.
• Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are:
• For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as
• Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the __________ number.
• According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B ? Assume that relative volatility (αAB = 2) does not change appreciably in the column.