Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 12, 2016 - November 13, 2016
It is important to investigate two-phase flow phenomena in tube bundles. In this study, difference of instantaneous and time-average void fractions in in-line and staggered tube bundles at pitch-to-diameter ratio of 1.5 were investigated. Void fraction distributions around tubes across horizontal tube bundle in liquid-gas two-phase flow were measured using X-ray radiography. It was confirmed that time-dependency of void fraction was more apparent in intermittent flow. Time-average void fraction distribution was high at front of a tube and low at back of a tube in bubbly and intermittent flows in the staggered bundles. Time-average void fraction at the maximum gap was higher than that around the other points at intermittent condition in in-line bundles. Volume-average void fraction in in-line tube bundle was approximately 20% higher than that in staggered bundle. Further, it was confirmed that volume-average void fraction at higher mass flux could be predicted by the Feenstra's equation.
