Abstract The effect of solid particles on the volumetric gas liquid mass transfer coefficient klal in slurry bubble column reactors was investigated in the present work. klal was measured for an air-water-glass bead system using the dynamic oxygen absorption technique. Three solid concentrations and two particle diameters were used. Solid particles had a negligible effect on klal due to two opposite effects. First, a fraction of the particles tends to be located in the bulk liquid, altering its viscosity. In the heterogeneous regime, increasing the solid concentration enhances bubble coalescence, which led to an increase in size and, as a result, a decrease in the gas-liquid interfacial area al. Second, another fraction of particles moves to the bubble surface due to the collision phenomenon and tends to accumulate in the liquid film, resulting in local turbulence and an increase in the liquid-side mass transfer coefficient kl. The hydrodynamic effect mechanism was the governing mechanism of the effect of solid particles on gas-liquid mass transfer within the range of the investigated operating conditions.

中文翻译：

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固体颗粒对浆液泡罩塔反应器体积气液传质系数的影响

摘要 本文研究了固体颗粒对浆液泡罩塔反应器体积气液传质系数klal 的影响。使用动态氧气吸收技术测量空气-水-玻璃珠系统的 klal。使用了三种固体浓度和两种粒径。由于两种相反的影响，固体颗粒对 klal 的影响可以忽略不计。首先，一部分颗粒倾向于位于大量液体中，从而改变其粘度。在非均相状态下，增加固体浓度会增强气泡聚结，导致尺寸增加，结果气液界面面积减少。其次，由于碰撞现象，另一部分粒子移动到气泡表面，并趋于积聚在液膜中，导致局部湍流和液体侧传质系数 kl 的增加。在所研究的工况范围内，流体动力效应机制是固体颗粒对气液传质影响的支配机制。