Behavior of confined granular beds under cyclic thermal loading

被引：16

作者：

Iliev, Pavel S. ^{[1
]}

Giacomazzi, Elena ^{[1
]}

Wittel, Falk K. ^{[1
]}

Mendoza, Miller ^{[1
,2
]}

Haselbacher, Andreas ^{[3
]}

Herrmann, Hans J. ^{[1
,4
]}

机构：

[1] Swiss Fed Inst Technol, IfB, Computat Phys Engn Mat, Stefano Franscini Pl 3, CH-8093 Zurich, Switzerland

[2] Univ Nacl Colombia, Dept Fis, Simulat Phys Syst Grp, Cra 30 45-03,Ed 404,Of 348, Bogota, Colombia

[3] Swiss Fed Inst Technol, Energy Sci Ctr, Sonneggstr 28, CH-8092 Zurich, Switzerland

[4] ESPCI, PMMH, UMR 7636, 7 Quai St Bernard, F-75005 Paris, France

来源：

GRANULAR MATTER | 2019年 / 21卷 / 03期

关键词：

Convection; Thermal storage; Cyclic loading; Granular packing; Contact dynamics method; Polyhedra particles; CONTACT DETECTION; CONVECTION; STORAGE; FLOW;

D O I：

10.1007/s10035-019-0914-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate the mechanical behavior of a confined granular packing of irregular polyhedral particles under repeated heating and cooling cycles by means of numerical simulations with the non-smooth contact dynamics method. Assuming a homogeneous temperature distribution as well as constant temperature rate, we study the effect of the container shape, and coefficients of thermal expansions on the pressure buildup at the confining walls and the density evolution. We observe that small changes in the opening angle of the confinement can lead to a drastic peak pressure reduction. Furthermore, the displacement fields over several thermal cycles are obtained and we discover the formation of toroidal convection cells inside the granular material. The root mean square of the vorticity is then calculated from the displacement fields and a quadratic dependency on the ratio of thermal expansion coefficients is established.

引用

页数：7

共 28 条

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