### Abstract

Originalsprache | englisch |
---|---|

Seitenumfang | 23 |

Fachzeitschrift | Granular matter |

Jahrgang | 19 |

Ausgabenummer | 14 |

DOIs | |

Publikationsstatus | Veröffentlicht - 17 Jan 2017 |

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### Schlagwörter

### Fields of Expertise

- Advanced Materials Science

### Dies zitieren

*Granular matter*,

*19*(14). https://doi.org/10.1007/s10035-016-0695-0

**Heat transfer rates in sheared beds of inertial particles at high Biot numbers.** / Forgber, Thomas; Mohan, Bhageshvar; Kloss, Christoph; Radl, Stefan.

Publikation: Beitrag in einer Fachzeitschrift › Artikel › Forschung › Begutachtung

*Granular matter*, Jg. 19, Nr. 14. https://doi.org/10.1007/s10035-016-0695-0

}

TY - JOUR

T1 - Heat transfer rates in sheared beds of inertial particles at high Biot numbers

AU - Forgber, Thomas

AU - Mohan, Bhageshvar

AU - Kloss, Christoph

AU - Radl, Stefan

PY - 2017/1/17

Y1 - 2017/1/17

N2 - We investigate heat conduction rates through the contact network of sheared granular materials that consist of particles with a density much larger than that of the ambient fluid. The tool ParScale, a finite difference solver for intra-particle transport processes, is coupled to the discrete element method solver LIGGGHTS to carry out the simulations. Heat transfer to the surrounding fluid is considered via a fixed heat transfer coefficient. We identify a combination of Biot and Peclet number as the key non-dimensional influence parameter to describe the non-dimensional heat flux through the particle bed and provide an analytical solution to calculate mean particle temperature profiles. Simulations over a wide range of particle volume fractions, Biot and Peclet numbers are then performed in order to develop a continuum model for the heat flux. We show that for Biot numbers below 10−3 our results agree with a simple model based on a uniform particle temperature. However, for Biot numbers above a certain threshold, the conductive heat flux decreases substantially depending on the flow situation, and temperature gradients within the particle should be considered in order to correctly predict the heat transfer rate to the surrounding fluid.

AB - We investigate heat conduction rates through the contact network of sheared granular materials that consist of particles with a density much larger than that of the ambient fluid. The tool ParScale, a finite difference solver for intra-particle transport processes, is coupled to the discrete element method solver LIGGGHTS to carry out the simulations. Heat transfer to the surrounding fluid is considered via a fixed heat transfer coefficient. We identify a combination of Biot and Peclet number as the key non-dimensional influence parameter to describe the non-dimensional heat flux through the particle bed and provide an analytical solution to calculate mean particle temperature profiles. Simulations over a wide range of particle volume fractions, Biot and Peclet numbers are then performed in order to develop a continuum model for the heat flux. We show that for Biot numbers below 10−3 our results agree with a simple model based on a uniform particle temperature. However, for Biot numbers above a certain threshold, the conductive heat flux decreases substantially depending on the flow situation, and temperature gradients within the particle should be considered in order to correctly predict the heat transfer rate to the surrounding fluid.

KW - Discrete Element Method

KW - ParScale

KW - Thermal Fluxes

UR - http://rdcu.be/oCVp

UR - http://link.springer.com/article/10.1007/s10035-016-0695-0

U2 - 10.1007/s10035-016-0695-0

DO - 10.1007/s10035-016-0695-0

M3 - Article

VL - 19

JO - Granular matter

JF - Granular matter

SN - 1434-5021

IS - 14

ER -