Abstract

An experimental study was carried out to understand the phenomena of the boiling flow of liquid nitrogen in an inclined tube with closed bottom by using a high speed motion analyzer. The experimental tube is 0.018 m ID and 1.0 m in length. The range of the inclination angle is 45-90° from the horizontal. The liquid slug length and velocity were studied. The mean liquid slug lengths increased first, and then decreased with decreasing θ, maximum at 60°, which showed the Taylor bubble was easier to coalescence from vertical to inclined, but coalescence lessening at 45°. The standard deviations of liquid slug lengths increase with increasing x/D at all inclination angles. The liquid slug propagation velocity increases first, and then decreases with decreasing θ, maximum at θ=60°, and is almost stable at 50D and 55D positions. These conclusions provide a basis for further study of the cryogenic two-phase slug flow.

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