Fluidization and Surface-to-Bed Heat Transfer Coefficient in Fluidized Beds of Very Fine Ni and Ni-Alloy Powders

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An attempt is made to study the fluidization and the surface-to-bed heat transfer coefficient in a fluidized bed of very fine (∼10 <I>μ</I>m) hydrogen-absorbing alloy (HAA) powder. Considering the difficulty in handling HAA powder fluidized directly by hydrogen, experiments were carried out using helium and nitrogen. In addition, two different types of nickel powders with similar size range were also employed for the investigation using hydrogen as well as helium and nitrogen as fluidizing gases.<BR>Bed pressure drop and voidage were measured with variation of gas velocity. It is found that the three powders are similar in fluidization characteristics, although some differences can be seen in shape and surface roughness of the primary particles.<BR>Surface-to-bed heat transfer coefficients were measured by immersed probes with cylindrical surfaces heated electrically. The measurement results were compared with predictions by a very simple model based on the application of the equation for single-phase flow, in which the dimensionless Nusselt, Reynolds and Prandtl numbers describe the effective properties of gas-solid suspension calculated by empirical correlations in literature. It is shown that the predictions agree with the experimental very well when modification is made to the effective velocity.

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  • Journal of chemical engineering of Japan  

    Journal of chemical engineering of Japan 31(1), 95-102, 1998-02 

    The Society of Chemical Engineers, Japan

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各種コード

  • NII論文ID(NAID)
    10002064955
  • 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
    4427707
  • 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  NDL  J-STAGE 
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