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Granular flow around the horizontal tubes of a particle heat exchanger: DEM-simulation and experimental validation

Bartsch, Philipp and Zunft, Stefan (2019) Granular flow around the horizontal tubes of a particle heat exchanger: DEM-simulation and experimental validation. Solar Energy. Elsevier. DOI: 10.1016/j.solener.2019.01.086 ISSN 0038-092X

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Abstract

Moving bed heat exchangers are a central element in solar thermal power plants using granular heat transfer fluids. Their performance is determined by a complex granular flow field in the device. This calls for accurate simulation models forming the basis for novel design tools. In this study we propose a discrete element model (DEM) to calculate the dense granular flow field around the horizontal tubes of a moving bed heat exchanger. The simulation results are compared to measurement data using particle image velocimetry (PIV). In the upper part of the tube the model agrees well with the experiment, capturing the relevant flow phenomena like the stagnant zone on top of the tube. Below the tube, a void area is observed both in the experiment and the simulation. However, the PIV analysis of the experimental data doesn’t resolve the void area and the associated flow phenomena due to the highly dynamic flow state, the inherent nature of PIV technique and additional disturbing effects in the setup. Therefore, the model can’t be validated in the corresponding regions. Still, the deviations between simulation and experiment are confined to a very narrow region directly at the tube surface in the lower part of the tube. In the rest of the flow field, the model proves to be a reliable tool for further investigations and will be used in future studies.

Item URL in elib:https://elib.dlr.de/126964/
Document Type:Article
Title:Granular flow around the horizontal tubes of a particle heat exchanger: DEM-simulation and experimental validation
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.2019.01.086
Publisher:Elsevier
ISSN:0038-092X
Status:Published
Keywords:Particle Moving bed heat exchanger Discrete element method Particle image velocimetry
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 15:10
Last Modified:09 Apr 2019 15:10

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