Effects of material properties on the competition mechanism of heat transfer of a granular bed in rotary cylinders

doi:10.1088/1674-1056/22/8/084501

中国物理B ›› 2013, Vol. 22 ›› Issue (8): 84501-084501.doi: 10.1088/1674-1056/22/8/084501

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Effects of material properties on the competition mechanism of heat transfer of a granular bed in rotary cylinders

谢知音, 冯俊小

School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China

收稿日期:2012-09-26 修回日期:2012-12-17 出版日期:2013-06-27 发布日期:2013-06-27
基金资助:
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).

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

Received:2012-09-26 Revised:2012-12-17 Online:2013-06-27 Published:2013-06-27
Contact: Feng Jun-Xiao E-mail:jxfeng@ustb.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: rotary cylinder, particle mixing, heat conduction, material properties

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.

Key words: rotary cylinder, particle mixing, heat conduction, material properties

中图分类号: (Granular systems)

45.70.-n

44.10.+i (Heat conduction) 44.30.+v (Heat flow in porous media)

谢知音, 冯俊小. Effects of material properties on the competition mechanism of heat transfer of a granular bed in rotary cylinders[J]. 中国物理B, 2013, 22(8): 84501-084501.

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[J]. Chin. Phys. B, 2013, 22(8): 84501-084501.

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Effects of material properties on the competition mechanism of heat transfer of a granular bed in rotary cylinders

Effects of material properties on the competition mechanism of heat transfer of a granular bed in rotary cylinders

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