Particle-particle contact heat transfer models in thermal DEM: A model comparison and experimental validation

Fischer, Jens; Rodrigues, Simson Julian; Kriegeskorte, Max; Hilse, Nikoline; Mahiques, Enric Illana; Scherer, Viktor; Tsotsas, Evangelos

doi:10.1016/j.powtec.2023.118909

Cited by 15 publications

(4 citation statements)

References 33 publications

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“…This is mainly due to the low thermal conductivity of the POM (about 800 times smaller than for aluminium). This different contribution of the two contact heat transfer phenomena for POM and aluminium agrees with the finding of Fischer et al [11]. In addition, it shall be mentioned that the total heat flow acting on the POM spheres at 10 minutes simulated time corresponds to 64 % of the heat flow received by the aluminium spheres.…”

Section: Resultssupporting

confidence: 91%

Examination of the Influence of Particle Parameters on Contact Heat Transfer on a Single Hearth Furnace Floor Using DEM

Hilse,

Scherer

2023

VIII International Conference on Particle-Based Methods

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In the present paper, contact heat transfer on a batch-operated single circular floor of a multiple hearth furnace is numerically examined using the Discrete Element Method (DEM). The particles are agitated on the floor by a single rabble arm equipped with mixing blades. Two different rabble arm configurations are studied, a rabble arm with three blades covering just the area from the centre of the floor to the wall enclosing the circular floor, and a rabble arm with six blades, which covers the whole diameter of the floor. The floor temperature is set to 100°C, and the initial particle temperature is 20°C. Spherical particles made of aluminium and polyoxymethylene (POM) with two particle diameters (10 and 20 mm) are examined. Blade angle inclination is varied, namely, 0°, 45° and 90°. The major results are that for POM spheres the major mechanism dominating contact heat transfer is the gas layer in the vicinity of the contact point particle-floor, whereas for aluminium the heat transfer through the direct contact point of floor and particle is of equal importance as the heat transfer through the gas layer. For the first configuration with three blades, a larger blade angle leads to lower heat up rates, while the second configuration with six blades, increases the heating rate for larger blade angles.

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Section: Resultssupporting

confidence: 91%

Examination of the Influence of Particle Parameters on Contact Heat Transfer on a Single Hearth Furnace Floor Using DEM

Hilse,

Scherer

2023

VIII International Conference on Particle-Based Methods

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“…When the heat transfer through the gas layer is neglected, the temperature graph only shows a very slow increase (black solid line). This accompanies the findings of our previous work [32] in which, for thermally thick particles with low heat conductivity, the main heat transport phenomenon takes place through the gas layer. For the present POM material, an analysis of H c and H g shows that 99% of the heat is transferred through the gas layer in the vicinity of the contact point.…”

Section: Numerical Results After Correction For Heat Losssupporting

confidence: 88%

“…When the heat transfer through the gas layer is neglected, the temperature graph only shows a very slow increase (black solid line). This accompanies the findings of our previous work[32] in which, for thermally thick particles with low heat conductivity, the main heat transport phenomenon takes place through the gas layer. For the present POM material, an analysis of H c and H g shows that 99% of the heat is transferred through the gas layer in the vicinity of the contact point.The grey lines in Figure11represent a case in which the material conductivity was raised to a value 1000 times greater than the one for POM (0.292 to 292 W/(mK)).…”

supporting

confidence: 89%

“…As a simplification, the same heat loss parameter is applied to each of the particles independent from its location in the bulk. This procedure was adapted from Fischer et al [32], who examined particleparticle contact heat transfer models in thermal DEM with 10 mm POM and aluminium spheres. The resulting net heat flux .…”

Section: Validation Of Particle Mechanicsmentioning

confidence: 99%

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Discrete Element Simulations of Contact Heat Transfer on a Batch-Operated Single Floor of a Multiple Hearth Furnace

Hilse,

Kriegeskorte,

Fischer

et al. 2023

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The multiple hearth furnace is a common industrial reactor for the thermal treatment of particulate material. The present contribution concentrates on a numerical analysis of contact heat transfer on a batch-operated single floor of a multiple hearth furnace employing the Discrete Element Method (DEM). The particles are agitated on an electrically heated circular floor by a single rotating rabble arm equipped with three flat blades. Blade angles have been varied from 0° to 90°. The DEM simulations (particle mechanics and contact heat transfer) were validated against experimental data. The transient heating of 20 mm diameter polyoxymethylene (POM) spheres was analysed. As the simulations did not consider natural convection inherently leading to time-varying heat losses, an averaged heat loss parameter was determined to represent heat dissipation from the particles to the surrounding gas and incorporated into the DEM simulations. With this approach, a good agreement with measurements was obtained. The DEM simulations and experiments do not show a large influence of the blade angle on the temporal evolution of the mean particle temperatures. However, the frequency distribution of particle temperature is dependent on the blade angle, revealing an increase in the standard deviation of the frequency distribution with an increasing blade angle.

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Improving the analysis of heat transfer in packed beds: A comparative study between DEM simulations and existing literature models

Alves,

Heinrich

2024

Chemical Engineering Research and Design

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Particle-particle contact heat transfer models in thermal DEM: A model comparison and experimental validation

Cited by 15 publications

References 33 publications

Examination of the Influence of Particle Parameters on Contact Heat Transfer on a Single Hearth Furnace Floor Using DEM

Examination of the Influence of Particle Parameters on Contact Heat Transfer on a Single Hearth Furnace Floor Using DEM

Discrete Element Simulations of Contact Heat Transfer on a Batch-Operated Single Floor of a Multiple Hearth Furnace

Improving the analysis of heat transfer in packed beds: A comparative study between DEM simulations and existing literature models

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