Abstract
Gas-liquid two-phase flows are widely encountered in industrial processes. To realize the dynamic detection of gas-liquid slug flows, a direct-image multi-electrode conductance sensor (DMCS) is optimized using the finite element method to access high measurement sensitivity. Through carrying out an experiment of vertical gas-liquid two-phase flows, the gas-liquid interfaces in slug flows are detected by the DMCS and compared to the results from a planar laser-induced fluorescence (PLIF) system. The interfaces detected by the DMCS and the PLIF system indicate a good agreement. By selecting an optimal threshold, the liquid film thicknesses around Taylor bubbles (TBs) are derived, and the asymmetry of circumferential film thickness distribution is investigated. Besides, the local cross-correlation velocities at circumferential pipe wall are measured by the DMCS. Finally, the TBs in slug flows are reconstructed based on the thickness and the velocity of the TBs. The reconstructed TBs allow for a clear indication of gas-liquid slug flow structures.
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