Experimental investigation on suppression of microbubbles to slug flow in vertical pipeline

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Fang, Z
Zhaolu, H
Li, J
Tang, Z
Xu, C
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2019
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Abstract

The microbubbles with the diameter of being less than 50 μm were uneasy to aggregate in fluid, and thus a method was proposed to suppress slug flow by the addition of microbubbles. The characteristics of the slug flow in a laboratory-scale offshore oil industry gathering-rising system were experimentally studied and analyzed by an electrical resistance tomography(ERT) combined with a pressure method and a high-speed camera method. The typical flow pattern and the motion behavior of the slug flow under different conditions were tested, and the flow performances of the microbubbles were evaluated. The influences of microbubbles on the slug flow formation were further investigated. Experimental results show that the microbubbles with a size range of 1 to 50 μm can be stably existed in a certain range of the flow rate when the intake air amount is set to 4 L/min. When the gas-liquid ratios are 1.18, 1.36 and 1.82, the microbubbles have a significant suppressing effect on the occurrence frequency of the slug flow. The mechanism is that the microbubbles suppress the movement of the slug by increasing the back mixing and disturbance resistance of the boundary layer, thus reducing the frequency of the slug generation.

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Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition)

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49

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3

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Environmental engineering

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Fang, Z; Zhaolu, H; Li, J; Tang, Z; Xu, C, Experimental investigation on suppression of microbubbles to slug flow in vertical pipeline, Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition), 2019, 49 (3), pp. 527-534

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