Effective Thermal Conductivity of Adsorbent Packed Beds

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  • MORI Hideo
    Department of Mechanical Engineering Science, Kyushu University
  • HAMAMOTO Yoshinori
    Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology
  • YOSHIDA Suguru
    Department of Mechanical Engineering Science, Kyushu University

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  • 吸着剤充てん層の有効熱伝導率
  • キュウチャクザイ ジュウテンソウ ノ ユウコウ ネツ デンドウリツ

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Abstract

The effective thermal conductivity of adsorbent packed beds of granular zeolite 13X and granular silica gel A in the presence of stagnant steam or air was measured under different conditions of the adsorbent bed temperature, particle size and filler-gas pressure. The measured effective thermal conductivity showed to become smaller with decreasing particle size or decreasing pressure, but it was nearly independent of the bed temperature. When steam was the filler-gas, the rise in the thermal conductivity of the adsorbent particles due to steam adsorption led to the increase in the effective thermal conductivity of the bed, and this effect was not negligible at high steam pressure for the bed of large particle size. It was found that both the predictions of the effective thermal conductivity by the Hayashi et al.'s model and the Bauer-Schlünder model generally agreed well with the measurements, by considering the particle thermal conductivity rise due to steam adsorption. The thermal conductivity of a consolidated bed of granular zeolite 13X was also measured, and it was found to be much larger than that of the packed bed especially at lower pressure. The above prediction models underestimated the effective thermal conductivity of the consolidated bed.

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