A Semi-empirical Correlation for Pressure Drop in Packed Beds of Spherical Particles |
| |
Authors: | Yong Seok Choi Sung Jin Kim Duckjong Kim |
| |
Institution: | (1) School of Mechanical, Aerospace and Systems Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Korea;(2) Micro/Bio Fluidics Team, Korea Institute of Machinery and Materials, Daejeon, 305-660, Korea |
| |
Abstract: | The effect of a confining wall on the pressure drop of fluid flow through packed beds of spherical particles with small bed-to-particle
diameter ratios was investigated to develop an improved pressure drop correlation. The dependency of pressure loss on both
wall friction and increased porosity near the wall was accounted for by using a theoretical approach. A semi-empirical model
was created based upon the capillary-orifice model, which included a wall correction factor for the inertial pressure loss.
In this model, packed beds were treated as a bundle of capillary tubes whose orifice diameter in the core region was different
from that of the wall region. Using this model, a new pressure drop correlation was obtained, based on the Ergun equation
and applicable for a wide range of Reynolds numbers (10−2–103). The proposed correlation was compared with previous correlations, as well as with experimental data. This correlation showed
close agreement with the experimental data for both low- and high-Reynolds number regimes and for a wide range of bed-to-particle
diameter ratios. The ratio of the pressure drop in finite packing to that in homogeneous packing was then calculated. This
ratio clearly shows how the wall effect depends on the Reynolds number and the bed-to-particle diameter ratio. |
| |
Keywords: | Packed beds Porous media Pressure drop Wall effect Particle |
本文献已被 SpringerLink 等数据库收录! |
|