| Citation: | ZHAO Qian, YIN Wuliang, CHEN Guanget al. Measurement of bubble velocity in air-liquid two-phase flow based on electromagnetic technique and cross correlation[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(11): 2181-2186. doi: 10.13700/j.bh.1001-5965.2017.0081(in Chinese)
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Air-liquid two-phase flow is a common flow pattern in industrial area. The relative velocity between the gas phase and the liquid phase in air-liquid two-phase flow should be considered for the two-phase flow. Technically, it is more challenging to study the instability of bubbles than regular and steady gas phase. A novel method combining electromagnetic test and cross correlation has been carried out in order to determine the bubble velocity in the air-water flow in vertical upward pipe. Higher excitation frequencies have better receiving signals. The high-frequency (>1 MHz) electromagnetic testing system was designed and two groups of electromagnetic sensors were installed in two parallel sections of the vertical upward pipe, each of which included an excitation coil and a receiving coil. Experimental results were collected and by cross-correlation algorithm, the bubble velocity could be calculated by the time difference of the phase signals on two receiving coils. Three kinds of bubbles with different velocities were distinguished in the experiment. Relative errors of the experimental results were controlled within 10%. The technique which is simple, effective, non-contact and non-invasive provides a new approach for the measurement of bubble velocity in two-phase flow. This method can be improved afterwards for other industrial applications, e.g. bubble parameter measurement in metal liquid.
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