Mc. Baker et R. Bonazza, VISUALIZATION AND MEASUREMENTS OF VOID FRACTION IN A GAS-MOLTEN TIN MULTIPHASE SYSTEM BY X-RAY-ABSORPTION, Experiments in fluids, 25(1), 1998, pp. 61-68
A technique has been developed to measure void fraction using X-rays i
n a 10 cm thick pool of molten tin with gas injection at various flow
rates. Visualization of the multiphase mixture using high energy X-ray
s can be performed at imaging rates of 220 fps with 256 X 256 pixel re
solution or at 30 fps with 480 X 1128 pixel resolution. The images are
subsequently processed to obtain two dimensional distributions of the
chordal average void fraction in the mixture. The estimated relative
uncertainty of the measurement is discussed in detail and shown to be
of the order of 10% of the reported value.