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2 Computer Assisted Methods in Engineering and Science

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Anisotropy of effective thermal conductivity analysis of heat transfer coefficient distribution around spherical particles in a packed bed

Asakuma Y., Asada M., Kanazawa Y., Yamamoto T.

Computer Assisted Methods in Engineering and Science

2015

Vol. 22, no. 1

31--38

Effective thermal conductivity with radiation is analyzed by a homogenization method. The method used can precisely represent the conditions around particles in a packed bed. In this study, the effects of variation in parameters such as heat transfer coefficient distribution around spherical particles in a packed bed, Reynolds number, temperature and particle size on the conductivity were estimated in order to elucidate the heat transfer mechanism of complex packed structures. The results show that it is unnecessary in heat transfer analysis to consider the anisotropic behavior of the flow direction for larger particles, high Reynolds numbers and high temperatures. However, the heat transfer was anisotropic for smaller particle sizes.

Effective thermal conductivity of porous materials and composites as a function of fundamental structural parameters

Asakuma Y., Yamamoto T.

Computer Assisted Methods in Engineering and Science

2013

Vol. 20, no. 2

89--98

We conducted thermal conductivity investigations by homogenization. This method can effectively model structural features such as pores within dispersed particle architectures via a finite element mesh. We investigated the factors that determine the effective thermal conductivity of porous structures and composites, such as the volume ratio of the continuous and dispersed phases, conductivity ratio, Biot number and particle packing model.