Characterization of gas-liquid flows in stirred vessels using pressure and torque fluctuations
Characterization of gas-liquid flows in stirred vessels using pressure and torque fluctuations
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DOI：
10.1021/ie0493412
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发表时间：
2005-04
影响因子：
4.2
通讯作者：
A. Khopkar;S. Panaskar;A. B. Pandit;V. Ranade
中科院分区：
文献类型：
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作者：
A. Khopkar;S. Panaskar;A. B. Pandit;V. Ranade
搅拌容器内的气液流动表现出不同的流型，并表现出不同时空尺度下复杂的输运过程相互作用。掌握流体动力学的关键空间和时间尺度对于设计和提高气液搅拌反应器的性能具有重要意义。本研究使用简单、稳健、非侵入性的实验技术（扭矩和压力传感器）来表征气液搅拌容器中的流体动力学特性。分析了从压力和扭矩传感器获得的时间序列，以制定流型识别准则。进一步分析扭矩和压力时间序列，提取流体动力学不同时间尺度的有价值信息。对转矩和壁面压力波动的详细分析，不仅提供了对流体动力学的深入了解，而且为搅拌容器内气液流动的在线监测提供了可能的机会。
Gas-liquid flows in a stirred vessel exhibit different flow regimes and demonstrate complex interaction of transport processes with varying spatio-temporal scales. The knowledge of key space and time scales of fluid dynamics is important for designing and enhancing the performance of gas-liquid stirred reactor. The present study uses simple, robust, and nonintrusive experimental techniques (torque and pressure sensors) to characterize the fluid dynamics in a gas-liquid stirred vessel. Time series obtained from the pressure and torque sensors were analyzed to develop criteria for flow regime identification. Further analyses of torque and pressure time series were done to extract valuable information of different time scales of fluid dynamics. The detailed analysis of torque and wall pressure fluctuations provided not only an insight into the fluid dynamics but also a possible opportunity to on-line monitoring of gas-liquid flows in stirred vessel.