Study on the Measurement of Void Fraction by Parallel Type Probe

Abstract

Measurements of void fraction by probe method has been the subject of a number of recent reports, which have highlighted certain problems remaining to be solved. In the present study, an attempt has been made to improve the single type probe, which resulted in the conclusion that use of the parallel type probe should have many merits for the measurement of local void fraction.
It was found that a suitable choice of the distance separating the parallel needles permits measurement of the void fraction in water of purity higher than with the other methods.
The values of the distribution of void fraction measured by this method agree well with those obtained with single and co-axial type probes.