Effect of Immersion Depth of Impeller on Power Number of Horizontal Shaft Agitator

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Other Title
  • 水平軸撹拌機の動力数に及ぼすインペラ浸液深さの影響

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The effect of immersion depth of the impeller on the power of a horizontal shaft agitator used as a gas-liquid contactor has been investigated.<BR>In lower Froude number region, power number may be expressed by the sum of two terms: standard power number (Np)S and additional power number Δ.<BR>It is found that (Np)s is the power number owing to the drag force of the impeller blade moving through liquid and Δ is the power number owing to the deformation of liquid surface caused by impeller blade which was immersed into and emergent from the liquid.<BR>When the liquid surface is below the center of the rotating shaft, (Np)s is proportional to the dimension-less integral I derived from theoretical considerations and Δ is proportional to the dimensionless immersion depth of impeller.<BR>In higher Froude number region, power number is proportional to the dimensionless integral.

Journal

  • Chemical engineering

    Chemical engineering 37 (9), 943-949,a1, 1973

    The Society of Chemical Engineers, Japan

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