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長さの影響

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タイトル別名
  • Effects of the Length of a Ring-Type Obstacle on Liquid Film Thickness in Upward Gas-Liquid Two-Phase Flow within a Vertical Tube.
  • エンチョクカン ナイ ジョウショウキエキ 2ソウリュウ ニ オケル エキマク アツサ ニ アタエル エントウケイ ショウガイブツ ナガサ ノ エイキョウ

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説明

A ring-type obstacle, which simulated a spacer in Light Water Reactor or a flow obstruction supporting heat exchanger tube, was set in an upward air-water two-phase flow within a vertical tube to investigate the effects of the obstacle on liquid film thickness in relation to the drypatch generation. We measured the axial distributions of time varying liquid film thickness near the obstacle in the range of the superficial water velocity of 0.06-1.6 m/s and the superficial air velocity of 0.5-36 m/s and discussed the effects of the length of the obstacle on the liquid film thickness. The results are summarized as follows: (1) The minimum film thickness and the mean film thickness near the obstacle become thinner as the length of the obstacle becomes shorter. (2) The length of the obstacle has stronger effects on both the minimum and the mean film thickness near the obstacle as the superficial water velocity becomes lower. (3) The generation of drypatch is possible under the flow conditions examined in the present experiment if heat is applied.

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