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EFFECT OF SURFACTANT ON TWO-PHASE flow patternS OF WATER-GAS IN CAPILLARY TUBES

Journal of Hydrodynamics 2007年第5期19卷 630-634页

作者： LIU Zhen-hua GAO Yi-pu School of Mechanical Engineering Shanghai Jiaotong University Shanghai 200240 China

flow patterns of liquid-gas two-phase flow were experimentally investigated. The experiments were carried out in both vertical and horizontal capillary tubes having inner diameters of 1,60 mm, The working liquid was the mixture of water and Sodium Dodecyl Benzoyl Sulfate （SDBS）. The working gas was Nitrogen. For the water/SDBS mixture-gas flow in the vertical capillary tube, flow-pattern transitions occurred at lower flow velocities than those for the water-gas flow in the same tube. For the water/SDBS mixture-gas flow in the horizontal capillary tube, surface tension had little effect on the bubbly-intermittent transition and had only slight effect on the plug-slug and slug-annular transitions. However, surface tension had significant effect on the wavy stratified flow regime. The wavy stratified flow regime of water/SDBS mixture-gas flow expanded compared with that of water-gas.

关键词： two-phase flow flow pattern map capillarytube surfactant

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Experimental Research on Gas-Liquid Two-Phase Spiral flow in Horizontal Pipe

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China Petroleum Processing & Petrochemical Technology 2012年第3期14卷 24-32页

作者： Wang Shuli Rao Yongchao Wu Yuxian Wang Xiaobing Changzhou University Jiangsu Key Laboratory of Oil-Gas Storage and Transportation Technology PetroChina Longhui Automation Engineering Co. Ltd.

In view of the importance of gas-liquid two-phase spiral flow and the few research reports at home and abroad,the gas-liquid two-phase spiral flow patterns have been researched in a horizontal pipe with different parameters investigated by means of observation and a high-speed *** the appearance of spiral flow makes the distribution of twophase flow more complicated,the flow patterns appearing in the experiments were divided into the Spiral Wavy Stratified flow(SWS),the Spiral Bubble flow(SB),the Spiral Slug flow(SS),the Spiral Linear flow(SL),the Spiral Axial flow(SA),and the Spiral Dispersed flow(SD) by the observations and with reference to the predecessors' research achievements.A flow pattern map has been drawn *** influence of velocity,vane angle and vane area on flow pattern conversion boundary and pressure drop has been studied,with a solid foundation laid for the future research work.

关键词： gas-liquid two-phase spiral flow vane flow pattern flow pattern map experimental research

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Application of time–frequency entropy from wake oscillation to gas–liquid flow pattern identification

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Journal of Central South University 2018年第7期25卷 1690-1700页

作者： HUANG Si-shi SUN Zhi-qiang ZHOU Tian ZHOU Jie-min School of Energy Science and Engineering Central South UniversityChangsha 410083China

Gas–liquid two-phase flow abounds in industrial processes and facilities. Identification of its flow pattern plays an essential role in the field of multiphase flow measurement. A bluff body was introduced in this study to recognize gas–liquid flow patterns by inducing fluid oscillation that enlarged differences between each flow pattern. Experiments with air–water mixtures were carried out in horizontal pipelines at ambient temperature and atmospheric pressure. Differential pressure signals from the bluff-body wake were obtained in bubble, bubble/plug transitional, plug, slug, and annular flows. Utilizing the adaptive ensemble empirical mode decomposition method and the Hilbert transform, the time–frequency entropy S of the differential pressure signals was obtained. By combining S and other flow parameters, such as the volumetric void fraction β, the dryness x, the ratio of density φ and the modified fluid coefficient ψ, a new flow pattern map was constructed which adopted S（1–x）φ and （1–β）ψ as the vertical and horizontal coordinates, respectively. The overall rate of classification of the map was verified to be 92.9% by the experimental data. It provides an effective and simple solution to the gas–liquid flow pattern identification problems.

关键词： gas–liquid two-phase flow wake oscillation flow pattern map time–frequency entropy ensemble empirical mode decomposition Hilbert transform

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Experiment research on influence of biodegradable surfactant on gas-liquid two-phase spiral flow in horizontal pipe

Experiment research on influence of biodegradable surfactant...

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第二十七届全国水动力学研讨会

作者： DAI Yuan RAO Yong-chao WANG Shu-li DAI Wen-jie ZHENG Ya-xing Jiangsu Key Laboratory of Oil-Gas Storage and Transportation Technology Changzhou University

The influence of biodegradable surfactant on gas-liquid two-phase spiral flow in horizontal pipe was investigated experimentally and compared with the sodium dodecyl benzene sulfonate(SDBS).Experiment investigation was conducted on air and water were worked as fluids,gas volume fraction was 10%0%,gas and liquid superficial velocity was0.01.0m/s,surfactants used were biodegradable coconut oil extracted from plants and SDBS,rotary device used was *** results presented demonstration that the influence of biodegradable coconut oil on spiral axial flow,spiral slug flow,spiral dispersed flow was similar to *** three flow patterns appeared earlier than ever before and scopes were *** surfactant concentration was 500 ppm,the main flow pattern of coconut oil was spiral dispersed flow while SDBS was spiral slug flow.

关键词： surfactant biodegradability gas-liquid two-phase spiral flow flow pattern flow pattern map

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