Lecture 31: Examples on pressure drop calculations
Example 2:
Partial oxidation is carried out by passing air with 1.2 mol percent hydrocarbons through tube packed with 8' of cylindrical catalyst pellets. The air enters at and 2.0 atm with a superficial velocity of 3 ft/s. Calculate the pressure–drop because of friction.
Assume, .
Answer:
(Fig. 31b)
First calculate of the packed material (pellet).
diameter of a sphere having the same volume as that of cylindrical pellet.
, surface area of cylindrical pellet, length or diameter of the pellet . And, ( = volume of the pellet)
tube packed with 8' of 
cylindrical catalyst pellets. The air enters at 
and 2.0 atm with a superficial velocity of 3 ft/s. Calculate the pressure–drop because of friction.
.
of the packed material (pellet). 
diameter of a sphere having the same volume as that of cylindrical pellet. 
, surface area of cylindrical pellet, 
length or diameter of the pellet . And,
( = volume of the pellet)
