The Mechanism of a Temperature Decrement of Porous Materials Immersed in a Fluidized Bed in Drying

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The temperature decrement in the inner parts of porous materials immersed in a gas-solid fluidized bed was observed in drying. To clarify the mechanism of this phenomenon, a theoretical calculation includes heat and mass transfers in a porous material (sample) was performed, and the heat balance in the sample was estimated. The effects of temperature of drying gas and the thermal conductivity of the sample on the temperature decrement were also examined.<BR>In the case of fluidized bed drying, the amount of heat flow in a sample is very large at the earlier period of drying (surface evaporation period). After the sample surface dried, the amount of heat flow in the inner parts of the sample is governed by the thermal conductivity of the sample. During the period, the amount of heat consumption for evaporation increases and it becomes larger than that of heat conduction in the inner parts of the sample in drying. This inversion is the reason of the temperature decrement in the inner parts of the sample in fluidized bed drying. The decrement degree of temperature becomes larger as the temperature of drying gas increases. The temperature decrement occurs more easily as the thermal conductivity becomes lower.

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  • Journal of chemical engineering of Japan

    Journal of chemical engineering of Japan 37(7), 875-881, 2004-07-01

    The Society of Chemical Engineers, Japan

参考文献:  14件中 1-14件 を表示

被引用文献:  2件中 1-2件 を表示

各種コード

  • NII論文ID(NAID)
    10013442719
  • NII書誌ID(NCID)
    AA00709658
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00219592
  • NDL 記事登録ID
    7016819
  • NDL 雑誌分類
    ZP1(科学技術--化学・化学工業)
  • NDL 請求記号
    Z53-R395
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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