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Purging of a multilayer insulation with dacron tuft spacer by gas diffusion
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Sumner, I. E. Fisk, W. J. |
| Copyright Year | 1976 |
| Description | The time and purge gas usage required to purge a multilayer insulation (MLI) panel with gaseous helium by means of gas diffusion to obtain a condensable gas (nitrogen) concentration of less than 1 percent within the panel are stipulated. Two different, flat, rectangular MLI panels, one incorporating a butt joint, were constructed of of 11 double-aluminized Mylar (DAM) radiation shields separated by Dacron tuft spacers. The DAM/Dacron tuft concept is known commercially as Superfloc. The nitrogen gas concentration as a function of time within the MLI panel could be adequately predicted by using a simple, one dimensional gas diffusion model in which the boundary conditions at the edge of the MLI panel were time dependent. The time and purge gas usage required to achieve 1 percent nitrogen gas concentration within the MLI panel varied from 208 to 86 minutes and 34.1 to 56.5 MLI panel purge volumes, respectively, for gaseous helium purge rates from 10 to 40 MLI panel volumes per hour. |
| File Size | 17097312 |
| Page Count | 30 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19770005156 |
| Archival Resource Key | ark:/13960/t92853z48 |
| Language | English |
| Publisher Date | 1976-12-01 |
| Access Restriction | Open |
| Subject Keyword | Launch Vehicles And Space Vehicles Gaseous Diffusion Gaseous Fuels Cryogenic Fluid Storage Purging Dacron Trademark Mylar Trademark Nitrogen Helium Multilayer Insulation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
