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An experimental study was carried out to understand the phenomena of the boiling flow of liquid nitrogen in inclined tubes with closed bottom by using a high speed motion analyzer.The experimental tubes are 0.018 and 0.014 m inner diameter(ID) and 1.0 m in length.The range of the inclination angle is 45°-90° from the horizontal.The experimental observation on the liquid slug was carried out along the tubes.Statistical method was employed to analyze the experimental data.The experiment analyzed the influences of the inclination angle and the tube diameter on the liquid slug length and velocity.The results show the liquid slug propagation velocity increases with the decrease of inclination angle θ.For all cases,the maximum values of the mean liquid slug lengths were obtained at θ = 60°.The mean liquid slug lengths were greater for large tube at higher tube position.These conclusions provide a basis for further study liquid slug of cryogenic two-phase undeveloped slug flow. 相似文献
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王经唆 《大连铁道学院学报》1980,(2)
本文在分析国外内燃机车功率等级的基础上,结合国内近期和不久将来的国内运输要求,以及内燃机车制造及运用的现状,详细论述了我国貨运内燃机车、客运内燃机车和调车内燃机车的功率等级,並提出在客运内燃机车和调车内燃机车上採用液力传动的看法;另外,还简略论述了如何从现有内燃机车的基础上发展这个功率等级的具体意见。 相似文献
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