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Analysis of a space emergency ammonia dump using the FLOW-NET two-phase flow programVenting of cryogenic and non-cryogenic fluids to a vacuum or a very low pressure will take place in many space-based systems that are currently being designed. This may cause liquid freezing either internally within the flow circuit or on external spacecraft surfaces. Typical ammonia flow circuits were investigated to determine the effect of the geometric configuration and initial temperature, pressure, and void fraction on the freezing characteristics of the system. The analysis was conducted also to investigate the ranges of applicability of the FLOW-NET program. It was shown that a typical system can be vented to very low liquid fractions before freezing occurs. However, very small restrictions in the flow circuit can hasten the inception of freezing. The FLOW-NET program provided solutions over broad ranges of system conditions, such as venting of an ammonia tank, initially completely filled with liquid, through a series of contracting and expanding line cross sections to near-vacuum conditions.
Document ID
19930004201
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Navickas, J. (McDonnell-Douglas Space Systems Co. Huntington Beach, CA, United States)
Rivard, W. C. (Maine Univ. Orono., United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1992
Publication Information
Publication: NASA. Lewis Research Center, The Fourth Annual Thermal and Fluids Analysis Workshop
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
93N13389
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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