ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Effects of material properties on the competition mechanism of heat transfer of a granular bed in rotary cylinders |
Xie Zhi-Yin (谢知音), Feng Jun-Xiao (冯俊小) |
School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract Mixing and heat transfer processes of the granular materials within rotary cylinders play a key role in industrial processes. The numerical simulation is carried out by using the discrete element method (DEM) to investigate the influences of material properties on the bed mixing and heat transfer process, including heat conductivity, heat capacity, and shear modulus. Moreover, a new Péclet number is derived to determine the dominant mechanism of the heating rate within the particle bed, which is directly related to thermal and mechanical properties. The system exhibits a faster heating rate with the increase of ratio of thermal conductivity and heat capacity, or the decrease of shear modulus when inter-particle conduction dominates the heating rate; conversely, it shows a fast-mixing bed when particle convection governs the heating rate. The simulation results show good agreement with the theoretical predictions.
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Received: 26 September 2012
Revised: 17 December 2012
Accepted manuscript online:
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PACS:
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45.70.-n
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(Granular systems)
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44.10.+i
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(Heat conduction)
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44.30.+v
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(Heat flow in porous media)
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Fund: Project supported by the National High Technology Research and Development Program of China (Grant No. 2007AA05Z215) and the Fundamental Research Funds for the Central Universities (Grant No. FRF-AS-10-005B). |
Corresponding Authors:
Feng Jun-Xiao
E-mail: jxfeng@ustb.edu.cn
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Cite this article:
Xie Zhi-Yin (谢知音), Feng Jun-Xiao (冯俊小) Effects of material properties on the competition mechanism of heat transfer of a granular bed in rotary cylinders 2013 Chin. Phys. B 22 084501
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