鉛直管内上昇気液二相流における液膜厚さに与える円筒形障害物の開口比の影響(流体工学,流体機械)

概要

論文の詳細を見る
A ring-type obstacle, which simulated a spacer in a light water reactor or a flow obstruction supporting heat exchanger tube, was set in an upward air-water two-phase flow in a vertical tube to investigate the effects of the obstacle on liquid film thickness in relation to the drypatch generation. We measured simultaneously the time varying liquid film thickness at several axially different locations near the obstacle under the conditions of the superficial water velocity ranging from 0.06m/s to 0.4m/s and the superficial air velocity from 0.5m/s to 36m/s and discussed the effects of the opening area ratio of the obstacle on the liquid film thickness. The results are summarized as follows: (1) The minimum film thickness near the obstacle becomes thinner as the clearance between the obstacle and the inner surface of tube becomes smaller. (2) The obstacle makes the disturbance wave smooth and it makes the base film thick downstream of the obstacle when the clearance is small.
一般社団法人日本機械学会の論文
2004-04-25