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Water contaminant mitigation in ionic liquid propellant

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dc.contributor.author Conroy, David
dc.contributor.author Ziemer, John
dc.date.accessioned 2014-09-05T20:17:16Z
dc.date.available 2014-09-05T20:17:16Z
dc.date.issued 2009-09-20
dc.identifier.citation 31st International Electric Propulsion Conference, Ann Arbor, Michigan, September 20-24, 2009 en_US
dc.identifier.clearanceno 09-3678
dc.identifier.uri http://hdl.handle.net/2014/44687
dc.description.abstract Appropriate system and operational requirements are needed in order to ensure mission success without unnecessary cost. Purity requirements applied to thruster propellants may flow down to materials and operations as well as the propellant preparation itself. Colloid electrospray thrusters function by applying a large potential to a room temperature liquid propellant (such as an ionic liquid), inducing formation of a Taylor cone. Ions and droplets are ejected from the Taylor cone and accelerated through a strong electric field. Electrospray thrusters are highly efficient, precise, scaleable, and demonstrate low thrust noise. Ionic liquid propellants have excellent properties for use as electrospray propellants, but can be hampered by impurities, owing to their solvent capabilities. Of foremost concern is the water content, which can result from exposure to atmosphere. Even hydrophobic ionic liquids have been shown to absorb water from the air. In order to mitigate the risks of bubble formation in feed systems caused by water content of the ionic liquid propellant, physical properties of the ionic liquid EMI–Im are analyzed. The effects of surface tension, material wetting, physisorption, and geometric details of the flow manifold and electrospray emitters are explored. Results are compared to laboratory test data. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2009 en_US
dc.title Water contaminant mitigation in ionic liquid propellant en_US
dc.type Presentation en_US


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