Find the operation where diffusion of solids not occurs
Explanation: Distillation is the liquid-liquid operation where no diffusion on solid is possible.
Find the diffusivity through slab if N flux of A 4 mol/sq.m sec, concentration difference is 2mol/cu.m and distance is 3 m.
Explanation: N flux of A= D(AB)/z * concentration difference
D(AB) = 6 sq.m/sec.
Find the activated diffusivity of carbon if energy of activation is 6 kJ; the value of constant diffusivity is 2.5 sq.m/sec. (Hint: the value of exponential of (-6/RT) is 2.55)
Explanation: Activated diffusivity= constant diffusivity * exponential value
= 2.5 * 2.55
The term activated means _____________
Explanation: Activated represents the activation energy which depends on temperature.
If the two gases are separated by a polymer membrane, the extent of diffusion depends on _______ law.
Explanation: Concentration is directly proportional to pressure so Hendry law is applicable.
For permanent gases diffusivity the order is _________ sq.m/s
Explanation: The gas can become permeable to certain substance if it is in an order of 10-10.
The solute movement of fluid on solids are __________
Explanation: Solute movement is due to pressure difference which is hydrodynamic.
If the pore of the solid is inaccessible to external fluids then it is known as dead end.
Explanation: If the pore of the solid is inaccessible to external fluids then it is known as isolate.
Macroporic surrounding of microscopic pellets powders of different magnitude in size is _______
Explanation: The double surrounding of these pellets is known as bi-disperse.
Find the permeability if diffusivity is 2 units and solubility coefficient is 5 units assume all are in SI units.
Explanation: Permeability = solubility co-efficient * diffusivity
= 2 * 5 =10 units.