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首页> 外文期刊>Journal of Chemical Engineering of Japan >Effect of Plate Geometry on Characteristics of Fluid Flow and Mass Transfer in External-Loop Airlift Bubble Column
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Effect of Plate Geometry on Characteristics of Fluid Flow and Mass Transfer in External-Loop Airlift Bubble Column

机译：平板几何形状对外环气举气泡塔内流体流动和传质特性的影响

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摘要

The influence of plate geometry (single hole plate and perforated plate) on the characteristics of fluid flow and mass transfer in an external-loop airlift bubble column was experimentally examined using an air-water system. The gas holdup can be well correlated with the drift flux correlation including liquid circulation velocity expressed by the correlation obtained by Okada et al. (1996) irrespective of plate geometry. The bubble size distribution may follow a log-normal probability distribution. The Sauter mean bubble diameter affecting the gas-liquid interfacial area decreases with increasing gas velocity for a single hole plate, whereas it increases for perforated plate. Therefore correlation equations for Sauter mean bubble diameter are proposed for both a single hole plate and a perforated plate following the result by Okada et al. (1996). The specific gas-liquid interfacial area is also correlated for single hole plate on the basis of the result by Miyahara et al. (1997) whereas the correlation is modified for a perforated plate with respect to an effect of hole diameter of perforated plate. In addition, it is found that the correlation for the liquid-phase volumetric mass transfer coefficient is expressed by the result proposed by Okada et al. (1996) regardless of plate geometry.
机译：使用气-水系统实验研究了板几何形状（单孔板和多孔板）对外环气举气泡塔中流体流动和传质特性的影响。气体滞留率可以与漂移通量相关性很好地相关，包括由Okada等人获得的相关性表示的液体循环速度。 （1996年），无论板的几何形状。气泡大小分布可以遵循对数正态概率分布。对于单孔板，影响气体-液体界面面积的索特平均气泡直径随着气体速度的增加而减小，而对于多孔板，其平均直径增加。因此，根据Okada等人的结果，针对单孔板和多孔板提出了索特平均气泡直径的相关方程。 （1996）。根据Miyahara等人的结果，单孔板的气液界面比面积也相关。 （1997），而对于多孔板，相对于多孔板的孔直径的影响修改了相关性。此外，发现由Okada等人提出的结果表示了液相体积传质系数的相关性。 （1996年），无论板的几何形状。

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