細管内空気-水二相流の流動特性に及ぼす管内径の影響

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Flow regime, void fraction, rising velocity of slug bubbles and frictional pressure loss were measured for air-water flows in capillary tubes with inner diameters in the range from 1 to 4 mm. Although some flow regimes peculiar to capillary tubes were observed in addition to commonly observed ones, overall trends of the boundaries between flow regimes were predicted well by the Mishima-Ishii model. The void fraction was predicted well by the drift flux equation used together with a new equation for the distribution parameter as a function of inner diameter. The rising velocity of the slug bubbles was also predicted well by the drift flux equation. The frictional pressure loss was reproduced well by Chisholm's equation used together with a new equation for Chisholm's parameter C as a function of inner diameter.
1995-09-25