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Cryogenic capillary screen heat entrapment
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Hastings, L. J. Stathman, G. Bolshinskiy, L. G. |
| Copyright Year | 2007 |
| Description | Cryogenic liquid acquisition devices (LADs) for space-based propulsion interface directly with the feed system, which can be a significant heat leak source. Further, the accumulation of thermal energy within LAD channels can lead to the loss of sub-cooled propellant conditions and result in feed system cavitation during propellant outflow. Therefore, the fundamental question addressed by this program was: "To what degree is natural convection in a cryogenic liquid constrained by the capillary screen meshes envisioned for LADs.?"Testing was first conducted with water as the test fluid, followed by LN2 tests. In either case, the basic experimental approach was to heat the bottom of a cylindrical column of test fluid to establish stratification patterns measured by temperature sensors located above and below a horizontal screen barrier position. Experimentation was performed without barriers, with screens, and with a solid barrier. The two screen meshes tested were those typically used by LAD designers, "200x1400" and "325x2300", both with Twill Dutch Weave. Upon consideration of both the water and LN2 data it was concluded that heat transfer across the screen meshes was dependent upon barrier thermal conductivity and that the capillary screen meshes were impervious to natural convection currents. |
| File Size | 1254511 |
| Page Count | 14 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20090028646 |
| Archival Resource Key | ark:/13960/t9867gt5f |
| Language | English |
| Publisher Date | 2007-07-12 |
| Access Restriction | Open |
| Subject Keyword | Propellants And Fuels Leakage Water Heat Sources Propellants Cryogenics Cylindrical Bodies Thermal Conductivity Cavitation Flow Stratification Free Convection Thermal Energy Heat Transfer Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
