かくはんそうによるＷ／Ｏおよび（Ｗ／Ｏ）／Ｗ分散系の液滴平均径

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  • Mean Drop Diameters of W/O- and (W/O) /W-Dispersions in an Agitated Vessel
  • カクハンソウ ニヨル W O オヨビ W O W ブンサンケイ ノ エキテキ

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Diameters of drops in an agitated vessel were measured for water drops dispersed in kerosene (W/O-emulsion) and W/O-emulsion drops dispersed in water ((W/O) /W-dispersion) in the presence of Span-80 as an emulsifying agent.<BR>Drop size distributions for the W/O-emulsion were expressed by a logarithmic normal distribution. Sauter mean diameters for the W/O- and (W/O) /W-dispersions depend on the agitation speed, impeller diameter and emulsifying agent concentration. The concentration dependence corresponds to the variation of interfacial tension obtained under dynamic conditions. Water drops dispersed in oil scarcely coalesced when the emulsifying agent was added. As the result, the drop size distribution did not vary with the dispersed-phase holdup fraction, and the effect of Weber number on drop diameter was larger than that reported for system without emulsifying agent.

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