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Showing 1 to 2 of 2 for “"Frozen air"”.
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The Safe Removal of Frozen Air from the Annulus of a Liquid Hydrogen Storage Tank
… are vital infrastructure for NASA. Eventually, air may leak into the evacuated and perlite filled annular region of these tanks. Although the vacuum level is monitored in this region, the extremely cold temperature causes all but the helium and neon constituents of air to freeze. A small, often …
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Novel Preparation of Porous Alumina using Ice Particles as Pore-Forming Agents
… particles to an alumina slurry which was quickly frozen, air dried, and then sintered. Porosity was characterized using Scanning Electron Microscopy (SEM), Archimedes measurements, and gas sorption techniques. Small spherical pores were successfully created in the 20-200?m range and larger …