気泡の閉塞により誘起される不安定流動 : 第1報,発生機構に関する実験結果

概要

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Thermo-hydraulic instability has been investigated experimentally in a boiling two-phase flow system composed of a vertical N-shaped boiling channel and an adiabatic bypass between an inlet and an outlet plenums, using Freon 113. The instability caused by the blockage of vapor to flow, which does not belong to Boure's classification of two-phase flow instabilities, is observed. The flow maps in each section, the static characteristics, the stable flow limits and the characteristics of this instability have been studied under various conditions to clarify the occurring mechanism. It makes the inlet velocity decrease for a vapor slug combined in the inverted U-shaped bend to obstruct the flow. The vapor slug flowing into the downcomer with the growth rises the void fraction in the downcomer and causes the gravitational loss to increase. Therefore, flow instability is brought about.
社団法人日本機械学会の論文
1986-08-25