Discharge Characteristics of Cryogenic Fluids From a Pressurized Vessel

Published

July 18, 1994

Author(s)

Jiann C. Yang, William M. Pitts, B D. Breuel, G. Gmurczyk, William J. Rinkinen, W G. Cleveland

Abstract

An experimental technique to study the rapid release of liquid cryogenic fluids from a pressurized vessel orientated downward is described. A rupture disc was used as the release mechanism. Experimental observations were made on the discharge characteristics of two cryogenic fluids, C4F10 (FC-31-10) and C3F8 (FC-218), which were proposed as potential candidates for replacement of halon 1301 (CF3Br) as fire suppressant. For comparison, halon 1301 was also included in this study. Various parameters that could influence the discharge process were studied. These parameters were: (1) orifice opening, (2) the effect of an extension tube at the vessel exit, and (3) initial charge pressure. The events occurring internal and external to the vessel during discharge of FC-31-10 or FC-218 were studied with high-speed photography and a transparent acrylic vessel. The average penetration velocities of the spray at various locations downstream were measured by means of a laser extinction technique. Two distinct flashing behaviors were observed at the vessel exit. The first flashing occurred immediately after the bursting of the rupture disc, and the second appeared at or before the moment the liquid was depleted from the vessel. During depressurization, no internal boiling of FC-31-10 or FC-218 was observed. Increasing the initial charge pressure reduced the emptying time of the liquid. Decreasing the orifice opening was found to increase the liquid emptying time significantly. The behavior of the liquid inside the vessel was found to be very similar whether an extension tube was present or absent at the vessel exit: an indication of two-phase critical flow.

Proceedings Title

Liquid Atomization and Spray Systems, 6th International Conference Proceedings

Conference Dates

July 18-22, 1994

Conference Location

Rouen

Pub Type

Conferences

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Keywords

cryogenic fluids, discharge rate, halon 1301

Citation

Yang, J. , Pitts, W. , Breuel, B. , Gmurczyk, G. , Rinkinen, W. and Cleveland, W. (1994), Discharge Characteristics of Cryogenic Fluids From a Pressurized Vessel, Liquid Atomization and Spray Systems, 6th International Conference Proceedings , Rouen, -1, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=911313 (Accessed December 13, 2024)