A Superfluid Plug for Space
This experiment is concerned with the problem of containing liquid helium in space. On earth, one maintains cryogenic equipment at 4°K by immersing it in liquid helium and utilizing the latent heat of the liquid to dissipate any heat input. Gravitational phase separation allows the boil-off gas to be withdrawn at the top of the dewar. Two major problems arise in a zero-g environment. First, we no longer may have an open gas-evacuation line because liquid will also be withdrawn. Second, there may not always be enough liquid in contact with the equipment to dissipate the entire heat input; consequently, the temperature of the system will rise.
KeywordsHeat Input Liquid Helium Normal Fluid Poiseuille Equation Porous Plug
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