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Simple Model for Gas Holdup and liquid velocity of Annular Photocatalytic External-Loop Airlift Reactor Under both Bubble and Developing Slug Flow

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Transactions of Tianjin University 2016年第3期22卷 228-236页

作者：王一平陈为强黄群武冯加和崔勇 School of Chemical Engineering and Technology Tianjin University Research Institute of Architectural Design & Urban Planning Tianjin University

Based on the momentum conservation approach, a theoretical model was developed to predict the superficial liquid velocity, and a correlation equation was established to calculate the gas holdup of an annular external-loop airlift reactor(AELAR)in the bubble flow and developing slug flow pattern. Experiments were performed by using tap-water and silicone oil with the viscosity of 2.0 mm^2/s(2cs-SiO)and 5.0 mm^2/s(5cs-SiO)as liquid phases. The effects of liquid viscosity and flow pattern on the AELAR performance were investigated. The predictions of the proposed model were in good agreement with the experimental results of the AELAR. In addition, the comparison of the experimental results shows that the proposed model has good accuracy and could be used to predict the gas holdup and liquid velocity of an AELAR operating in bubble and developing flow pattern.

关键词： gas holdup liquid velocity annular external airlift bubble flow slug flow

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Study of Water Movement in Unsaturated Copper Ore

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Journal of China University of Mining and Technology 2007年第4期17卷 516-520页

作者： LI Xun YANG Ze-ping ZHENG Zhi-hong College of Engineering and Architecture Zhefiang University Hangzhou Zhejiang 310027 China East China Institute of Technology Fuzhou Jiangxi 344000 China

Leaching is widely applied in the exploitation of depleted ores. In order to discover the law of leachant movement in the leaching process and calculating volumes and time intervals of spraying leachant,experiments and numerical simulation with the TOUGH2/EOS3 module were carried out in order to find out the principle of water movement in unsaturated copper ore. The results show that water volume increases at the same location over time,that copper ore tends to become saturated and that liquid velocity decreases at the same time as the distance from top in-creases. On the other hand,a comparison and analysis of our experimental and simulated results indicate that the EOS3 module could accurately simulate the water movement in an unsaturated state.

关键词： unsaturated copper ore volumetric water content liquid velocity simulation

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Three-Dimensional velocity Distribution Measurement Using Ultrasonic velocity Profiler with Developed Transducer

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Journal of Flow Control, Measurement & Visualization 2022年第1期10卷 32-55页

作者： Naruki Shoji Hiroshige Kikura Hideharu Takahashi Wongsakorn Wongsaroj Laboratory for Zero-Carbon Energy Tokyo Institute of Technology Tokyo Japan Department of Instrumentation and Electronics Engineering King Mongkut’s University of Technology North Bangkok Bangkok Thailand

This study describes an ultrasonic velocity profiler that uses a new ultrasonic array transducer with unique 5-element configuration, with all five elements acting as transmitters and four elements as receivers. The receivers are designed to reduce the amount of uncertainty. As the fluid moves through this setup, four Doppler frequencies are obtained. The multi-dimensional velocity information along the measurement line can be reconstructed. The transducer has a compact geometry suitable for a wide range of applications, including narrow flow areas. The transducer’s basic frequency and sound pressure are selected and evaluated to be compatible with the application. First, to confirm the measurement ability, the measurement of the developed system in two-dimensional flow is validated by comparing it to the theoretical data. The uncertainty of measurement was within 15%. Second, the three-dimensional measurement in turbulent and swirling flow is proved experimentally to check the applicability of the proposed technique.

关键词： Doppler Frequency liquid velocity Three-Dimensional Measurement Transducer Design Ultrasonic

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