Mass Transfer
When the liquid phase and vapour phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of
Vapour pressure of component A to the partial pressure of A
Partial pressure of component A to the total pressure
Vapour pressure of component A to that of component B
Vapour pressure of component A to the total pressure
Flights (located in the inside shell of rotary dryer) lift the material being dried and shower it down through the current of hot air/gases. It extends from the wall to a distance which is about 8-12%
Hold up of a rotary drier is defined as the fraction of the dryer volume occupied by the solid at any instant. The best performance for rotary drier is obtained, when the hold up is in the range of 0.
Rotary dryer is suitable for drying sticky material
Recommended peripherial speed of a rotary drier is in the range of 10 to 30 metres/minute
EXAMIANS