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Main Title: Numerical investigation of mechanical axial dispersion in slender fixed-beds
Author(s): Jurtz, Nico
Schönherr, Tobias David
Kraume, Matthias
Type: Article
Abstract: The description of the mixing characteristics is of fundamental interest for modeling mass transport in fixed-bed reactors. A method based on Lagrangian parcel tracking is presented to determine the axial dispersion coefficient in the mechanical dispersion regime from particle-resolved computational fluid dynamics (CFD) results. The impact of fluid dynamic entry effects and the necessary averaging length on the axial dispersion coefficient is studied, showing that the often reported dependency on the entry length is almost not existent, but a result of insufficient averaging, caused by to short bed heights. The axial dispersion coefficients are determined for different particle shapes and a novel reactor wall concept. A strong correlation is found between the relative variance of the axial velocity and the axial dispersion coefficient.
Subject(s): axial dispersion
complex particle shapes
fixed-bed reactor
particle-resolved CFD
wall structures
Issue Date: 12-Sep-2021
Date Available: 3-Aug-2022
Language Code: en
DDC Class: 660 Chemische Verfahrenstechnik
Journal Title: AIChE Journal
Publisher: Wiley
Volume: 68
Issue: 1
Article Number: e17431
Publisher DOI: 10.1002/aic.17431
EISSN: 1547-5905
ISSN: 0001-1541
TU Affiliation(s): Fak. 3 Prozesswissenschaften » Inst. Prozess- und Verfahrenstechnik » FG Verfahrenstechnik
Appears in Collections:Technische Universität Berlin » Publications

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