Open AccessEXPERIMENTAL STUDY ON THE DYNAMICS OF A SPOUTED BED WITH PARTICLE FEED THROUGH THE BASE
Author(s) -
Luís Alexandre Pedro de Freitas,
José Teixeira Freire
Publication year - 1997
Publication title -
brazilian journal of chemical engineering/brazilian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.313
H-Index - 52
eISSN - 1678-4383
pISSN - 0104-6632
DOI - 10.1590/s0104-66321997000300012
Subject(s) - draft tube , particle (ecology) , mechanics , volumetric flow rate , tube (container) , base (topology) , dynamics (music) , flow (mathematics) , materials science , physics , composite material , geology , mathematics , acoustics , mathematical analysis , oceanography
A model is proposed for the average effective diffusivity for an arbitrary pore size distribution. It is shown that the average diffusivity must also depend on the distribution of the catalyst sites. The reaction diffusivity is compared with the average diffusivities defined by Wakao and Smith (1962) and Johnson and Stewart (1965). For the methanol dehydration and n-butene isomerization, the reaction diffusivity gives a better estimation of the effectiveness factor than the other model