Effects of Unsteady Agitation by Reversing Revolution of an Impeller in an Agitated Vessel with Aeration.

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  • 通気撹はん槽における翼の反転による非定常撹はんの効果
  • ツウキ カクハンソウ ニ オケル ヨク ノ ハンテン ニヨル ヒテイジョウ

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Abstract

The effects of unsteady agitation, which was carried out by reversing the direction of revolution periodically, on mixing of water in an agitated vessel with aeration were investigated. The change in concentration of tracer CO2 gas absorbed by water with time at twenty local positions and power consumption were measured in order to discuss the effects from the view points of mass transfer, power consumption and mixedness on the basis of information entropy. The effects can not be elucidated on the basis of mass transfer capacity coefficient and power consumption. Conversely, information concerning the effects is obtained based on the mixedness. It is considered that the change in mixedness with time occurs over three ranges. These ranges are consistent with three stages in the mixing process. In the first stage, unsteady agitation finishes faster and the mixedness at the end of the first and the second stages in unsteady agitation take higher values than those in the steady agitation. In unsteady agitation, the variance of the local values of mixedness in the vessel becomes smaller than that in the steady agitation. In other words, unsteady agitation contributes to the homogeneous mixing over the vessel.

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