Gas hold-up, mixing time and gas-liquid volumetric mass transfer coefficient of various multiple-impeller configurations:: Rushton turbine, pitched blade and techmix impeller and their combinations
Gas hold-up, mixing time and gas-liquid volumetric mass transfer coefficient of various multiple-impeller configurations:: Rushton turbine, pitched blade and techmix impeller and their combinations
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DOI：
10.1016/s0009-2509(02)00682-6
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发表时间：
2003-05-01
影响因子：
4.7
通讯作者：
Prokopová, E
中科院分区：
文献类型：
--
作者：
Moucha, T;Linek, V;Prokopová, E
给出了内径0.29 m的三叶轮容器中18种叶轮配置的气含率、以相邻叶轮间交换流为特征的分散混合强度和体积传质系数。Rushton涡轮机，6个倾斜叶片叶轮向下抽水和水翼叶轮Techmix 335 （Techmix公司，捷克共和国）向上或向下抽水及其组合。液相采用0.5 M Na2SO4水溶液，代表非成煤批次。气含率和体积传质系数是作为耗散功率和表面气速的函数给出的。传质系数回归结果标准差较大（30%）。在回归中加入表示叶轮构型效果的功率数对标准差没有显著改善（23%）。低功率数（小于1）的叶轮配置具有较高的分散混合强度，而高功率数的叶轮配置具有较好的传质性能。2003爱思唯尔科学有限公司版权所有。
Gas hold-up, mixing intensity of dispersion characterised by exchange flows between adjacent impellers and a volumetric mass transfer coefficient are presented for 18 impeller configurations in triple-impeller vessel of inner diameter 0.29 m. Rushton Turbines, six Pitched Blade impellers pumping down and hydrofoil impellers Techmix 335 (Techmix co., Czech republic) pumping up or down and their combinations were used. 0.5 M Na2SO4 aqueous solution was used as a liquid phase, which represents non-coalescent batches. Gas hold-ups and volumetric mass transfer coefficients are presented for individual configurations as functions of specific power dissipated and superficial gas velocity. The regression of the mass transfer coefficients shows large standard deviation (30%). The power number included to the regression to express the impeller configuration effect did not improve the standard deviation significantly (23%). The impeller configurations with low power number (less than unity) provide higher dispersion mixing intensities, while the impeller configurations with high power number provide better mass transfer performance. (C) 2003 Elsevier Science Ltd. All rights reserved.