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Numerical investigation of dense granular flow around horizontal tubes: Qualification of CFD model with validated DEM model

Bartsch, Philipp and Zunft, Stefan (2019) Numerical investigation of dense granular flow around horizontal tubes: Qualification of CFD model with validated DEM model. Solar Energy. Elsevier. DOI: 10.1016/j.solener.2019.01.087 ISSN 0038-092X

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Abstract

Granular material offer many advantages which qualify them for use as heat transfer medium and heat storage material in solar thermal power plants and industrial processes. Moving bed heat exchangers (MBHE) with horizontal tubes are favorable to extract thermal energy from hot granular materials. However, due to the complex flow phenomena and heat transport mechanisms in granular materials precise design tools for MBHE are lacking. In previous studies we introduced a discrete particle model (DEM) to calculate the granular flow in MBHE and validated it by experiments. In this study we use this precise but computationally expensive DEM model to qualify a more efficient continuum model (CFD) which is being introduced in this work. We compare the two models with regard to the granular flow speed along the tube surface and find deviations of |Δu/uref| < 20% in the upper part of the tubes. Both models coherently predict the formation of a static area at the top of the tubes. The formation of the void area below the tubes is less accurately predicted, calling for further adaptations of the CFD model. The thus qualified CFD allows to study large heat exchanger geometries with substantially reduced computational effort.

Item URL in elib:https://elib.dlr.de/126967/
Document Type:Article
Title:Numerical investigation of dense granular flow around horizontal tubes: Qualification of CFD model with validated DEM model
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bartsch, PhilippPhilipp.Bartsch (at) dlr.deUNSPECIFIED
Zunft, StefanStefan.Zunft (at) dlr.dehttps://orcid.org/0000-0002-8499-3067
Date:April 2019
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.solener.2019.01.087
Publisher:Elsevier
ISSN:0038-092X
Status:Published
Keywords:Moving bed heat exchanger Particle Continuum model Thermal energy storage
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Thermal Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes (Storage)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Bartsch, Philipp
Deposited On:09 Apr 2019 15:12
Last Modified:09 Apr 2019 15:12

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