An application of a homogenization method to the estimation of effective thermal conductivity of a hydrogen storage alloy bed considering variation of contact conditions between alloy particles

Kenta Ueoka, Shinsuke Miyauchi, Yusuke Asakuma, Toshiyuki Hirosawa, Yoshio Morozumi, Hideyuki Aoki, Takatoshi Miura

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

A homogenization method is applied to the estimation of effective thermal conductivity of a hydrogen storage alloy bed. By including the contact conditions between the alloy particles, the effect of contact conditions on the thermal conductivity is investigated. When the pressure is lower than 1 bar, the effective thermal conductivity increases with an increase in the mean gap distance and the contact ratio of point contact. On the other hand, when the pressure is higher than 1 bar, the effective thermal conductivity increases with an increase in the contact ratio of plane contact and the Biot number. In addition, in the comparison of the parameters before and after charge and discharge cycles, it is shown that the mean gap, the contact ratio of plane contact and Biot number are involved in a decrease in effective thermal conductivity of the pulverized alloy particle bed.

Original languageEnglish
Pages (from-to)4225-4232
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume32
Issue number17
DOIs
Publication statusPublished - 2007 Dec

Keywords

  • Contact conditions
  • Effective thermal conductivity
  • Homogenization method
  • Hydrogen storage alloy bed
  • Pulverization

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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