NDLI: Atmospheric pressure effects on cryogenic storage tank boil-off

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Atmospheric pressure effects on cryogenic storage tank boil-off

Content Provider	NASA Technical Reports Server (NTRS)
Author	Frontier, C. R. Sass, J. P.
Copyright Year	2007
Description	The Cryogenics Test Laboratory (CTL) at the Kennedy Space Center (KSC) routinely utilizes cryostat test hardware to evaluate comparative and absolute thermal conductivities of a wide array of insulation systems. The test method is based on measurement of the flow rate of gas evolved due to evaporative boil-off of a cryogenic liquid. The gas flow rate typically stabilizes after a period of a couple of hours to a couple of days, depending upon the test setup. The stable flow rate value is then used to calculate the thermal conductivity for the insulation system being tested. The latest set of identical cryostats, 1,000-L spherical tanks, exhibited different behavior. On a macro level, the flow rate did stabilize after a couple of days; however the stable flow rate was oscillatory with peak to peak amplitude of up to 25 percent of the nominal value. The period of the oscillation was consistently 12 hours. The source of the oscillation has been traced to variations in atmospheric pressure due to atmospheric tides similar to oceanic tides. This paper will present analysis of this phenomenon, including a calculation that explains why other cryostats are not affected by it.
File Size	3919802
Page Count	8
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20120000557
Archival Resource Key	ark:/13960/t3227w88s
Language	English
Publisher Date	2007-07-16
Access Restriction	Open
Subject Keyword	Mechanical Engineering Insulation Pressure Effects Amplitudes Cryogenic Tanks Atmospheric Pressure Cryogenic Fluid Storage Oscillations Flow Velocity Circular Cylinders Spherical Tanks Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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