The effects of packing structure on the effective thermal conductivity of granular media: A grain scale investigation

被引:52
作者
Dai, Weijing [1 ]
Hanaor, Dorian [2 ]
Gan, Yixiang [1 ]
机构
[1] Univ Sydney, Sch Civil Engn, Sydney, NSW 2008, Australia
[2] Tech Univ Berlin, Fachgebiet Keram Werkstoffe, Berlin, Germany
基金
澳大利亚研究理事会;
关键词
Granular media; Packing structure; Grain-scale; Effective thermal conductivity; Discrete element method; HEAT-CONDUCTION; PACKED-BEDS; MODEL; SIMULATION; GAS; COMPOSITES; DIFFUSION; PRESSURE; SYSTEMS; ORDER;
D O I
10.1016/j.ijthermalsci.2019.04.028
中图分类号
O414.1 [热力学];
学科分类号
摘要
Structural characteristics are considered to be the dominant factors in determining the effective properties of granular media, particularly in the scope of transport phenomena. Enhancing heat management requires an improved fundamental understanding of thermal transport in granular media. In this study, the effects of packing structure on heat transfer in granular media are evaluated at macro- and grain-scales. At the grain-scale, a gas-solid coupling heat transfer model is adapted into a discrete-element-method to simulate this transport phenomenon. The numerical framework is validated by experimental data obtained using a plane source technique, and the Smoluchowski effect of the gas phase is found to be captured by this extension. By considering packings of spherical SiO2 grains with an interstitial helium phase, vibration induced ordering in granular media is studied, using the simulation method developed here, to investigate how disorder-to-order transitions of packing structure enhance effective thermal conductivity. Grain-scale thermal transport is shown to be influenced by the local neighbourhood configuration of individual grains. The formation of an ordered packing structure enhances both global and local thermal transport. This study provides a structure-based approach to explain transport phenomena, which can be applied in properties modification for granular media.
引用
收藏
页码:266 / 279
页数:14
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