Study of Liquid-Solid Mass Transfer and Hydrodynamics in Micropacked Bed with Gas-Liquid Flow.
Study of Liquid-Solid Mass Transfer and Hydrodynamics in Micropacked Bed with Gas-Liquid Flow.
复制标题
气液流动微填料床液固传质及流体力学研究。
DOI：
10.1021/acs.iecr.1c00089
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发表时间：
2021-07-28
影响因子：
4.2
通讯作者：
Gavriilidis A
中科院分区：
文献类型：
--
作者：
Cao E;Radhakrishnan ANP;Hasanudin RB;Gavriilidis A
采用铜溶出法研究了硅片基微填充床反应器（MPBR）气液两相流动下的体积液固传质系数，并将其与反应器流体力学行为联系起来。使用高速摄像机和一个强大的计算图像分析方法，选择性地分析了铜颗粒周围的床空隙率，所观察到的流体动力学直接相关的MPBR中的L-S传质速率。该流体动力学研究揭示了填充铜床内的不同脉冲结构，这取决于在增加气体速度时在填充床之前建立的流型。一个“液体为主的段塞”流状态与上游段塞流进料。上游段塞-环状流供给形成“稀疏段塞”流态。在较高的气速下，环形流进料形成了“气体连续脉动”的状态，其特征与宏观填料床中的脉动流相似，但它对上游或下游压力波动的扰动敏感且容易不稳定。液弹流区体积传质系数随气速的增大而减小，稀弹流区体积传质系数随气速的增大而减小。通过解析液弹流向稀弹流的过渡过程，并捕捉到气液两相连续流的脉动流态，获得了气液两相流对MPBR中液液两相传质速率的影响规律。
The volumetric liquid–solid (L-S) mass transfer coefficient under gas–liquid (G-L) two-phase flow in a silicon-chip-based micropacked bed reactor (MPBR) was studied using the copper dissolution method and was related to the reactor hydrodynamic behavior. Using a high-speed camera and a robust computational image analysis method that selectively analyzed the bed voidage around the copper particles, the observed hydrodynamics were directly related to the L-S mass transfer rates in the MPBR. This hydrodynamic study revealed different pulsing structures inside the packed copper bed depending on the flow patterns established preceding the packed bed upon increasing gas velocity. A “liquid-dominated slug” flow regime was associated with an upstream slug flow feed. A “sparse slug” flow regime developed with an upstream slug-annular flow feed. At higher gas velocity, a “gas continuous with pulsing” regime developed with an annular flow feed, which had similar features to the pulsing flow in macroscale packed beds, but it was sensitive and easily destabilized by disturbances from upstream or downstream pressure fluctuations. The volumetric L-S mass transfer coefficient decreased with increasing gas velocity under the liquid-dominated slug flow regime and became rather less affected under the sparse slug flow regime. By resolving the transition from the liquid-dominated slug flow to the sparse slug flow and capturing the onset of the gas-continuous with pulsing regime, we gained new insights into the hydrodynamic effects of G-L flows on the L-S mass transfer rates in a MPBR.
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DOI：
10.1016/j.cep.2016.09.016
发表时间：
2016-12-01
影响因子：
4.3
作者：
Faridkhou, Ali;Tourvieille, Jean-Noel;Larachi, Faical
通讯作者：
Larachi, Faical
DOI：
10.1016/0255-2701(89)90003-2
发表时间：
1989-10-01
影响因子：
4.3
作者：
BARTELMUS, G
通讯作者：
BARTELMUS, G
影响因子：
2.5
作者：
Gonzalez-Mendizabal, D;Aguilera, ME;Pironti, F
通讯作者：
Pironti, F
DOI：
10.1016/j.cep.2010.04.013
发表时间：
2010-09-01
影响因子：
4.3
作者：
Knochen, Jens;Guettel, Robert;Turek, Thomas
通讯作者：
Turek, Thomas
影响因子：
4.7
作者：
Boelhouwer, JG;Piepers, HW;Drinkenburg, AAH
通讯作者：
Drinkenburg, AAH