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- Title
CFD modelling of mass and heat dispersion in sphere fixed bed with porosity-dependent segmented-continuum approaches.
- Authors
Hamzah, Anthony Basuni; Ookawara, Shinichi; Yoshikawa, Shiro; Matsumoto, Hideyuki
- Abstract
Highlights • Two types of packed bed near-wall modeling were proposed for continuum CFD approach. • In terms of heat transfer, both types of modeling achieved sufficient accuracy. • In terms of mass transfer, prediction accuracy depended on near-wall modeling. Abstract CFD modeling of fixed bed reactors is indispensable for understanding and optimization of its internal heat and mass dispersion. Those CFD models were earlier developed with continuum approach for high tube-to-particle diameter ratio (N p) beds. Particle-resolved CFD models followed, in spite of much higher computational cost, for investigating low N p bed with high heat flux, in which transport phenomena at near wall region with high porosity significantly affects the entire bed performance. Although segmented-continuum approaches were recently paid attention again, the validity and applicability regarding the extent of near-wall region and simplification of porosity distribution have not been carefully discussed yet. In this study, two of segmented-continuum approaches, namely, (Approach 1) two lumped segments and (Approach 2) near-wall-detailed and bulk-lumped segments approaches, were proposed and examined for CFD modelling of sphere fixed bed. The numerical results of those approaches were validated using experimental and particle-resolved CFD simulation data in the literature. In terms of heat dispersion, both approaches were in good agreement with the experimental data. However, the model accuracy in terms of mass dispersion was sensitive to the near-wall treatments because mass diffusion in fluid phase was much higher than that in solid phase of particles.
- Subjects
COMPUTATIONAL fluid dynamics; DISPERSION (Chemistry); POROSITY; CONTINUUM mechanics; HEAT transfer; FIXED bed reactors
- Publication
Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers Part A, 2019, Vol 141, p93
- ISSN
0263-8762
- Publication type
Article
- DOI
10.1016/j.cherd.2018.10.022