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A chemical model for barium oxide depletion from hollow cathode’s insert

A chemical model for barium oxide depletion from hollow cathode’s insert
A chemical model for barium oxide depletion from hollow cathode’s insert
In this paper a chemical model to predict barium oxide depletion from hollow cathode insert is developed. This model is based on the knowledge of the ternary diagram that exists in the BaO-CaO-Al2O3 system. This model takes also into account the diffusive motion of barium oxide inside the insert. A comparison between numerical and experimental data is made to determine the diffusion coefficient inside the insert. The diffusion coefficient presents an Arrhenius trend with activation energy similar to the one of barium oxide evaporation. A two dimensional model is used to demonstrate how temperature profile along the insert is a key parameter to calculate barium depletion.
hollow cathodes insert, chemistry, barium oxide depletion, electric propulsion, life time
American Institute of Aeronautics and Astronautics
Coletti, M.
f99567c2-8fab-42dd-9e25-c3f69495667f
Gabriel, S.B.
ac76976d-74fd-40a0-808d-c9f68a38f259
Coletti, M.
f99567c2-8fab-42dd-9e25-c3f69495667f
Gabriel, S.B.
ac76976d-74fd-40a0-808d-c9f68a38f259

Coletti, M. and Gabriel, S.B. (2007) A chemical model for barium oxide depletion from hollow cathode’s insert. In Proceedings of the 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. American Institute of Aeronautics and Astronautics. 11 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

In this paper a chemical model to predict barium oxide depletion from hollow cathode insert is developed. This model is based on the knowledge of the ternary diagram that exists in the BaO-CaO-Al2O3 system. This model takes also into account the diffusive motion of barium oxide inside the insert. A comparison between numerical and experimental data is made to determine the diffusion coefficient inside the insert. The diffusion coefficient presents an Arrhenius trend with activation energy similar to the one of barium oxide evaporation. A two dimensional model is used to demonstrate how temperature profile along the insert is a key parameter to calculate barium depletion.

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More information

Submitted date: July 2007
Published date: July 2007
Additional Information: AIAA-2007-5193
Venue - Dates: 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, United States, 2007-07-08 - 2007-07-11
Keywords: hollow cathodes insert, chemistry, barium oxide depletion, electric propulsion, life time
Organisations: Astronautics Group

Identifiers

Local EPrints ID: 47968
URI: https://eprints.soton.ac.uk/id/eprint/47968
PURE UUID: f7387c0a-dd60-4171-9edd-d9571ac0edc8

Catalogue record

Date deposited: 15 Aug 2007
Last modified: 19 Jul 2019 18:48

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Contributors

Author: M. Coletti
Author: S.B. Gabriel

University divisions

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