自己蒸発を伴う管内飽和水流の研究

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  • On the Flashing Flow of Saturated Water Through Horizontal Pipes
  • ジコ ジョウハツ オ トモナウ カンナイ ホウワ スイリュウ ノ ケンキュウ

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The energy equation for a single phase is usually applied to predict the pressure drop of the flashing flow of steam-water mixtures. This energy equation must be solved in such a way that the solution not only gives the relations among the pressure drop, the mass flow rate, and other factors, but also is applicable without discrepancy to the critical flow. In this paper, a new correction factor ψm for friction loss is introduced to satisfy the above mentioned requirements and determined by experiment. The factor ψm is the ratio of the true coefficient of friction for the flashing flow to the calculated coefficient of friction for a homogeneous flow. An empirical formula for ψm is determined from the experiments over a pressure range from 1 to 8 ata, a range of the length of horizontal pipe line from 1 to 10 m, and a range of the internal diameter of pipe 10.0, 6.2 and 4.1-mm. The equation εfor critcal flow rates is also developed by using the empirical formula of ψm.

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