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首页> 美国政府科技报告 >Experimental Investigation of the Discharge of a Flashing Liquid from a Finite Reservoir: A Fundamental Study of the Two-Phase Flow Phenomena Occurring during Venting from Rail Tank Cars
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Experimental Investigation of the Discharge of a Flashing Liquid from a Finite Reservoir: A Fundamental Study of the Two-Phase Flow Phenomena Occurring during Venting from Rail Tank Cars

机译：有限储层闪蒸液排放的实验研究 - 轨道坦克车排气过程中两相流动现象的基础研究

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摘要

The design of pressure relief valves for railroad tank cars containing pressurized liquid commodities is dependent on knowledge of venting rates during accidents. In turn, development of an appropriate theoretical model requires knowledge of many properties which affect the venting rates of vapor, liquid and two-phase mixtures. This report describes experiments which expand upon previous studies to include measurements of horizontal temperature variations, quality of the two-phase mixture, bubble rise velocities and growth rates, fluid flow patterns and boiling phenomena during the blowdown. Venting tests were conducted with three different orifice sizes, four liquid fill fractions and two wall materials of different thermal conductivity. From this new data a detailed description of the two-phase blowdown is presented, including boiling and heat transfer effects. The essential visual features of the two phase flow and boiling were recorded with a high speed 16 mm movie camera. An edited film was produced and is available for future review of the phenomena described in this report.

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