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Residence time distribution of the liquid in two‐phase cocurrent downflow in packed beds: Air/newtonian and non‐newtonian liquid systems
Author(s) -
Iliuta I.,
Thyrion F. C.,
Muntean O.
Publication year - 1996
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450740531
Subject(s) - mechanics , porous medium , residence time distribution , newtonian fluid , non newtonian fluid , diffusion , dispersion (optics) , tracer , packed bed , residence time (fluid dynamics) , porosity , materials science , flow (mathematics) , thermodynamics , chemistry , chromatography , physics , composite material , geotechnical engineering , geology , optics , nuclear physics
New data on the liquid residence time distribution for two‐phase downflow of air‐Newtonian and non‐Newtonian liquids through packed beds of porous and non‐porous particles are presented. The piston‐dispersion‐exchange model is used to describe the liquid flow. With porous particles the dynamic evolution of the tracer concentration in the particles is described in terms of diffusion phenomena. The axial dispersion is very important in the case of two‐phase downflow of air‐water (trickle flow regime) and air‐CMC systems through fixed beds with porous particles, and is negligible in the case of non‐porous particles. With the porous particles, a key value is the effective diffusion coefficient of the tracer in the pores of the particles.