Local Void Fractions and Bubble Velocity in Vertical Air-Water Two-Phase Flows Measured by Needle-Contact Capacitance Probe

Table 1

Bubble velocities measured using the probe and the high-speed video.

Syringe needle diameter; (mm)	Bubble diameter; (mm)	(mm/s)	(mm/s)	Relative error (%)
0.1	1.3	272.7	250	9.09
0.5	1.5	272.7	250	9.09
0.9	1.6	253.5	250	1.41