A DEM study on the effective thermal conductivity of granular assemblies

Zhang, H. W., Zhou, Q., Xing, H. L. and Muhlhaus, H. (2011) A DEM study on the effective thermal conductivity of granular assemblies. Powder Technology, 205 1-3: 172-183.


Author Zhang, H. W.
Zhou, Q.
Xing, H. L.
Muhlhaus, H.
Title A DEM study on the effective thermal conductivity of granular assemblies
Journal name Powder Technology  (ERA 2012 Listed)    (ERA 2010 Rank A)   Check publisher's open access policy
Publication date 2011-01-10
Sub-type Article
Year available 2010
DOI 10.1016/j.powtec.2010.09.008
Volume number 205
Issue number 1-3
ISSN 0032-5910; 1873-328X
Start page 172
End page 183
Total pages 12
Place of publication Lausanne, Switzerland
Publisher Elsevier S.A.
Collection year 2011
Language eng
Abstract A discrete element method (DEM) is developed to simulate the heat transfer in granular assemblies in vacuum with consideration of the thermal resistance of rough contact surfaces. Average heat flux is formulated by the positions and heat flow rates of particles on the boundaries of the granular assemblies. Average temperature gradient is given as a best-fit formulation, which is computed from the relative position and temperature of particles. With the thermal boundary condition imposed on the border region, the effective thermal conductivity (ETC) of granular assemblies can be calculated from the average heat flux and temperature gradient obtained from DEM simulations. Moreover, the effects of particle size, solid volume fraction and coordination number on the ETC are also investigated. Simulation results show that granular assemblies with coarse particles and under large external compression forces exhibit a better heat conduction behavior. The effects of particle size and external compression forces on the ETC are in good agreement with experiment observations. © 2010.
Keyword Discrete element method
Effective thermal conductivity
Granular materials
Average heat flux
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 17 September 2010.

 
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Created: Sun, 19 Dec 2010, 00:03:10 EST