This document summarizes key concepts related to packed bed reactors including:
1) Pressure drop-flow relationships can be modeled using equations like the Hagen-Poiseuille equation for laminar flow and Ergun equation for turbulent flow.
2) Parameters like particle surface area, wetted perimeter, and equivalent diameter are important for characterizing packed beds.
3) Filtration concepts like incompressible vs. compressible cakes and constant pressure drop filtration are relevant when particles accumulate in packed beds.
2. Pressure drop-flow relationship
/
U U
i
Tube equivalent diameter:
Hagen-Poiseuille:
Laminar flow:
2
e
H K H
Flow area = A; wetted perimeter = SBA;
SB: Particle surface area per unit volume of the bed.
Total particle surface area in the bed = SBAH
For packed bed, wetted perimeter = SBAH/H = SBA
