A1 Journal article (refereed), original research

Comparison of solid phase closure models in Eulerian-Eulerain simulations of a circulating fluidized bed riser


Open Access publication

Publication Details
Authors: Nikku Markku, Daikeler Alexander, Stroh Alexander, Myöhänen Kari
Publisher: Elsevier
Publication year: 2019
Language: English
Related Journal or Series Information: Chemical Engineering Science
Journal acronym: CES
Volume number: 195
Start page: 39
End page: 50
Number of pages: 12
ISSN: 0009-2509
eISSN: 1873-4405
JUFO-Level of this publication: 2
Open Access: Open Access publication
Location of the parallel saved publication: http://urn.fi/URN:NBN:fi-fe201902084346

Abstract

In this work, computational fluid dynamics with Eulerian-Eulerian
modeling approach is used in the investigation of the effect of the
solid phase closure models on the hydrodynamics of a circulating
fluidized bed riser. The studied models are the kinetic theory of
granular flow and the powder modulus model. Computational performance
and model prediction accuracy are investigated by performing transient
simulations for three different cases and for different mesh sizes. The
modeling results are compared with measured vertical pressure profile,
external circulation mass flow rates, and particle velocity and
concentration profiles obtained from a laboratory scale circulating
fluidized bed unit. Additionally the computational times are compared to
estimate the computational performance and to investigate if a simpler
set of closures is computationally more affordable. The results indicate
that both closure models can give good predictions for some quantities,
while lacking in other quantities. The results indicate that the
closure models for the solid phase have a noticeable effect on the model
predictions, such as the vertical pressure profile and external
circulation rate of the particles.


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Last updated on 2020-20-03 at 10:03