Time-dependent gas hold-up and bubble size distributions in a gas—highly viscous liquid—solid system

B.T. Kawalec-Pietrenko
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引用次数: 12

Abstract

The accumulation of small bubbles during the aeration of suspensions of a solid in a highly viscous liquid has been investigated. It was found that bubble size distribution is dependent on aeration time. Displacement of the maxima in the direction of smaller bubble diameters occurs during the aeration time and the maxima becomes higher. The distribution curves do not change after an “establishment time”. After this time, the small bubble hold-up and the total gas hold-up reach their final values. The contribution of small bubbles to the gas volume in the dispersion reaches about 60%, and depends on the liquid viscosity, the gas flow rate and the solid loading. The course of the small bubble accumulation process is described by the first order kinetic equation. The accumulation rate constant was found to be dependent on the superficial gas velocity and the apparent suspension viscosity.

气-高粘性液-固体系中随时间变化的气含率和气泡大小分布
研究了高粘性液体中固体悬浮液曝气过程中小气泡的积累。气泡大小分布与曝气时间有关。在曝气期间,最大值向气泡直径较小的方向发生位移,最大值变大。分布曲线在“建立时间”后不发生变化。在此之后,小气泡占率和总气体占率达到它们的最终值。在分散体中,小气泡对气体体积的贡献约为60%,它取决于液体粘度、气体流速和固体载荷。用一级动力学方程描述了小气泡积聚过程。发现累积速率常数依赖于表面气体速度和表观悬浮粘度。
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