The design of safety systems for rail tank cars carrying pressurized liquid commodities is dependent on knowledge of required venting rates during accident situations. Several theoretical models for two-phase flow rates are available in the literature. Unfortunately, predictions made using these models often vary to a significant degree. This paper describes a primarily experimental investigation of the two-phase blowdown of a flashing liquid from a finite reservoir through orifices and short pipes (L/D = 12 and 120). Detailes experimental results are presented, including time-varying mass flow rate, pressure, and temperature data for the flow of initially-saturated Freon-12 from a 20-liter vessel through 1.59- and 4.76-mm-dia. outlets. The nominal initial reservoir pressure was 50000 N/m(exp2) above ambient. Comparison of the experimental results with predictive schemes is made.


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    Title :

    An investigation into unsteady two-phase depressurization of vessels through orifices and short pipes


    Additional title:

    Untersuchung der Zweiphasendruckentlastung durch Duesen und kurze Rohre in Fluessiggasbehaeltern


    Contributors:

    Published in:

    ASME-Papers ; Aug ; 1-8


    Publication date :

    1978


    Size :

    8 Seiten, 9 Bilder, 12 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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