General Estimation of Just-Drawdown Speed of Floating Solids in Solid–Liquid Agitated Vessels

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  • Aida Masao
    Technology and Engineering Center, Idemitsu Kosan Co., Ltd.
  • Shono Atsushi
    Department of Industrial Chemistry, Faculty of Engineering, Tokyo University of Science

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Other Title
  • 固液撹拌槽における粒子巻き込み限界回転数の汎用的推算法
  • コエキ カクハンソウ ニ オケル リュウシ マキコミ ゲンカイ カイテンスウ ノ ハンヨウテキ スイサンホウ

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<p>New correlation equations to estimate the geometrical constant G (Takahashi and Sasaki, 1999) for just-drawdown speed of floating solids in solid-liquid agitated vessels were proposed. Different correlation equations were obtained for a radial flow impeller (disk turbine), down-pumping axial flow impellers (pitched paddle and marine propeller) and up-pumping axial flow impellers. The proposed equations are functions of power number Np, characteristic length D, impeller diameter d, distance from the static surface to the top of the impeller ht, and a correction factor for a square tank η. As a result of calculation, it was found that power consumption could be reduced by increasing d/D or decreasing ht/D in the case of radial flow impellers and down-pumping axial flow impellers. Conversely, in the case of up-pumping axial flow impellers, it was found that power consumption could be reduced by reducing d/D and that ht/D exists that minimizes power consumption. By using the proposed correlation equations, just-drawdown speed in a cylindrical tank with industrial baffle conditions and a square tank can be estimated with sufficient accuracy.</p>

Journal

  • KAGAKU KOGAKU RONBUNSHU

    KAGAKU KOGAKU RONBUNSHU 47 (5), 125-131, 2021-09-20

    The Society of Chemical Engineers, Japan

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