Module 9: Packed beds
  Lecture 30: Pressure-drop: Ergun's equation
 
 

Flow through packed bed (continued)

Pressure–drop calculation:

 
Notes
  1. Actual or real packed beds are randomly packed with irregular size particles
  2. The flow–path of a fluid though the packed bed is tortuous.
  • For the theoretical analysis to calculate pressure–drop, actual flow channels are replaced with parallel cylindrical conduits of constant cross–section. Particles are assumed to be of the same size and shape having constant sphericity, .
  • Pressure–drop occurs due to inertial and viscous effects. At high Reynolds number, inertial effects prevail, whereas the viscous effects are important at low Reynolds number. In general,