Related Questions

Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as
A K ∝ D
B K ∝ $$\sqrt {\text{D}} $$
C K ∝ D1.5
D K ∝ D2
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is
A 0
B 1
C > 1
The ratio of momentum diffusivity to thermal diffusivity is the __________ number.
A Prandtl
B Nusselt
C Stanton
D Grashoff
If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process'. The diffusivity under this condition is called 'Knudsen diffusivity', which is affected by the
A Pressure
B Temperature
C Both A & B
D Neither A nor B
Overall mass transfer co-efficient in case of absorption of __________ in water is based on the gas film co-efficient only, as the mass transfer process is gas film (phase) controlling.
A CO2
B SO2
C NH3
D None of these
Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as
A K ∝ D
B K ∝ $$\sqrt {\text{D}} $$
C K ∝ D1.5
D K ∝ D2
Mass transfer co-efficient is directly proportional to DAB according to the __________ theory.
A Film
B Penetration
C Surface-renewal
D None of these
Molecular diffusivity of a liquid
A Increases with temperature
B Decreases with temperature
C May increase or decrease with temperature
D Is independent of temperature
The scales form in heat exchanges after a period of operation and provide additional resistance to heat transfer with some heat transfer coefficient . The reciprocal of this scale heat transfer coefficient is called .
A scaling factor
B forming factor
C resisting factor
D fouling factor
Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)
A $$\frac{1}{{\text{k}}}$$
B k
C k2
D $$\frac{1}{{{{\text{k}}^2}}}$$

Next steps