Multiscale modelling of heat transfer from arrays of spherical particles

Arpit Singhal, Schalk Cloete, Stefan Radl, Shahriar Amini

Research output: Contribution to conferencePaperResearchpeer-review

Abstract

This work presents a modelling study of gas-particle heat transfer on two distinct scales. Firstly direct numerical simulations (DNS) are conducted in a geometry of spherical particles generated via the discrete element method (DEM). Simulations are completed on random particle arrays ranging from a void fraction of 0.9 to maximum packing over a range of Reynolds numbers. The geometry is meshed with a fine Cartesian cut-cell mesh both inside and outside the particles. These DNS results are then used to provide improved heat transfer closures to an unresolved Lagrangian modelling approach which can be used to simulate much larger particle beds. This model is derived for two different averaging approaches and then verified against DNS data. Minor differences in results are discussed and heat transfer models derived from DNS with a constant heat source inside the particles are compared to models derived from simulations with a constant particle surface temperature.
Original languageEnglish
Publication statusPublished - 27 May 2016
Event9th International Conference on Multiphase Flows (2016) - Florence, Italy
Duration: 22 May 2016 → …

Conference

Conference9th International Conference on Multiphase Flows (2016)
CountryItaly
CityFlorence
Period22/05/16 → …

Fingerprint

Direct numerical simulation
Heat transfer
Geometry
Void fraction
Finite difference method
Reynolds number
Gases
Temperature

Keywords

  • packed bed
  • Heat transfer
  • fluid mechanics

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

Fields of Expertise

  • Information, Communication & Computing

Treatment code (Nähere Zuordnung)

  • Basic - Fundamental (Grundlagenforschung)

Cite this

Singhal, A., Cloete, S., Radl, S., & Amini, S. (2016). Multiscale modelling of heat transfer from arrays of spherical particles. Paper presented at 9th International Conference on Multiphase Flows (2016), Florence, Italy.

Multiscale modelling of heat transfer from arrays of spherical particles. / Singhal, Arpit; Cloete, Schalk; Radl, Stefan; Amini, Shahriar.

2016. Paper presented at 9th International Conference on Multiphase Flows (2016), Florence, Italy.

Research output: Contribution to conferencePaperResearchpeer-review

Singhal, A, Cloete, S, Radl, S & Amini, S 2016, 'Multiscale modelling of heat transfer from arrays of spherical particles' Paper presented at 9th International Conference on Multiphase Flows (2016), Florence, Italy, 22/05/16, .
Singhal A, Cloete S, Radl S, Amini S. Multiscale modelling of heat transfer from arrays of spherical particles. 2016. Paper presented at 9th International Conference on Multiphase Flows (2016), Florence, Italy.
Singhal, Arpit ; Cloete, Schalk ; Radl, Stefan ; Amini, Shahriar. / Multiscale modelling of heat transfer from arrays of spherical particles. Paper presented at 9th International Conference on Multiphase Flows (2016), Florence, Italy.
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