Abstract:
A double-tip needle-contact capacitance probe is proposed to measure the void fraction as well as the bubble velocity of the slug flow in the vertical air-water two-phase flows. The working principle of this probe is derived by theoretical analyses, and then dynamic experiments are performed to acquire the signals of slug flow. The results show that the new probe works stably and reliably and that the probe is independent of the water salinity. Signals of slug flow detected by the needle-contact capacitance probe are consistent with the actual flow structure. The measured void fraction is
α=37.5% and the bubble velocity is
v=0.545 m/s.
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