非定常ガス拡散による多孔質体の有効空隙率および迷宮度の測定法

Kyuro Sasaki, Hiroshi Miyakoshi, Yoshiki Tamura

研究成果: Contribution to journalArticle査読

抄録

This paper describes a new and simple method for determination of effective porosity and tortuosity of porous media with transient gas diffusion flow through it.
The unsteady gas diffusion flow through porous media is influenced by the effective diffusivity and effective porosity void fraction. We proposed a method for measuring macropore structure by means of a numerical solution of the unsteady gas diffusion equation calculated with the finite difference method. The conditions of the numerical model, such as inlet and outlet gas concentrations at the end surfaces of the test piece, were matched with the experimental ones. The difference between the times required until the inlet concentration and outlet diffusion rates reach the halves of the steady state rates respectively was related to the macropore structures of porous media such as effective porosity, tortuosity and effective area fraction.
The present method was successfully applied to measure the diffusivity and macropore structure of fly ash-cement mortar specimens, whose composition of fly ash were varied from 0 to 40 weight %.
寄稿の翻訳タイトルTransient gas diffusion method for measurement of effective porosity and tortuosity of porous media
本文言語日本語
ページ(範囲)227-231
ページ数5
ジャーナルShigen to sozai
105
3
DOI
出版ステータス出版済み - 1989

All Science Journal Classification (ASJC) codes

  • 工学(全般)
  • 地球惑星科学(全般)

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