A novel Approach to Calculate Radiative Thermal Exchange in Coupled Particle Simulations

Research output: Contribution to journalArticleResearchpeer-review

Abstract

We present a novel algorithm to calculate radiative energy transfer rates in Discrete Element Method
(DEM)-based simulations of mono-disperse spheres. To verify our algorithm we use the Finite
Volume Method (FVM) which enables us to picture relevant radiation phenomena in a dense bed of
particles. These phenomena include (i) shadowing, (ii) emission and (iii) adsorption by a constant
grey medium. After careful verification, we embed our algorithm in LIGGGHTS, a solver for the DEM.
A combination of LIGGGHTS and a solver for intra-particle temperature gradients, i.e., ParScale,
is then used to quantify the relevance of radiative heat transfer rates in sheared particles beds.
Specifically, we evaluate the relative contributions of conductive, convective and radiative thermal
fluxes in granular shear flows of frictional inelastic spheres. We find that that the radiative flux can
be collapsed onto single curve if it is related to an appropriate dimensionless group. Our analysis
establishes a rationale on when radiative heat transfer in dense granular flows should be considered
or not. Also, our results can be used to close continuum-based granular dynamics model that aim
on predicting the particle temperature distribution under extreme temperature scenarios.
Original languageEnglish
Pages (from-to)24-44
JournalPowder Technology
Volume323
DOIs
Publication statusPublished - 2018

Fingerprint

Finite difference method
Heat transfer
Shear flow
Thermal gradients
Energy transfer
Dynamic models
Temperature distribution
Fluxes
Radiation
Adsorption
Hot Temperature
Temperature

Keywords

  • discrete element method
  • heat transfer
  • radiation

Fields of Expertise

  • Information, Communication & Computing

Cite this

A novel Approach to Calculate Radiative Thermal Exchange in Coupled Particle Simulations. / Forgber, Thomas; Radl, Stefan.

In: Powder Technology, Vol. 323, 2018, p. 24-44.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Radl, Stefan

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AB - We present a novel algorithm to calculate radiative energy transfer rates in Discrete Element Method(DEM)-based simulations of mono-disperse spheres. To verify our algorithm we use the FiniteVolume Method (FVM) which enables us to picture relevant radiation phenomena in a dense bed ofparticles. These phenomena include (i) shadowing, (ii) emission and (iii) adsorption by a constantgrey medium. After careful verification, we embed our algorithm in LIGGGHTS, a solver for the DEM.A combination of LIGGGHTS and a solver for intra-particle temperature gradients, i.e., ParScale,is then used to quantify the relevance of radiative heat transfer rates in sheared particles beds.Specifically, we evaluate the relative contributions of conductive, convective and radiative thermalfluxes in granular shear flows of frictional inelastic spheres. We find that that the radiative flux canbe collapsed onto single curve if it is related to an appropriate dimensionless group. Our analysisestablishes a rationale on when radiative heat transfer in dense granular flows should be consideredor not. Also, our results can be used to close continuum-based granular dynamics model that aimon predicting the particle temperature distribution under extreme temperature scenarios.

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