Note: Fabrication of roughened tips for liquid metal ion sources

Guo, Dan; Kang, Xiaoming; Hu, Jing; Liu, Xinyu; He, Weiguo

doi:10.1063/1.4985635

Cited by 4 publications

(1 citation statement)

References 13 publications

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“…The no-slip wall condition of fluid u = 0 is imposed on the tip surface. As the tip is approached, the area near the apex has no grooves [30], as shown in figure 2(b).…”

Section: Modelling Of the Liquid Cone Formation Processmentioning

confidence: 99%

Simulation of liquid cone formation on the tip apex of indium field emission electric propulsion thrusters

SUN 孙,

DENG 邓,

LIU 刘

et al. 2024

Plasma Sci. Technol.

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Field emission electric propulsion (FEEP) thrusters possess excellent characteristics such as high specific impulse, low power requirements, compact size, and precise pointing capabilities, making them ideal propulsion devices for micro-nano satellites. However, the detection of certain aspects, such as the evolution process of the liquid cone and the physical quantities at the cone apex, proves challenging due to the minute size of the needle tip and the vacuum environment in which they operate. Consequently, this paper introduces a computational fluid dynamics (CFD) model to gain insights into the formation process of the liquid cone on the tip apex of Indium FEEP. The CFD model is based on the electrohydrodynamic (EHD) equations and the volume of fluid (VOF) method. The entire cone formation process can be divided into three stages, and the time-dependent characteristics of the physical quantities at the cone apex are investigated. The influences of film thickness, apex radius size, and applied voltage are compared. The results indicate a gradual increase in the values of electrostatic stress and surface tension stress at the cone apex over an initial period, followed by a rapid escalation within a short duration. Apex configurations featuring a small radius, thick film, and high voltage exhibit a propensity for liquid cone formation, and the cone growth time decreasing as the film thickness increases. Moreover, some unstable behavior is observed during the cone formation process.

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“…The no-slip wall condition of fluid u = 0 is imposed on the tip surface. As the tip is approached, the area near the apex has no grooves [30], as shown in figure 2(b).…”

Section: Modelling Of the Liquid Cone Formation Processmentioning

confidence: 99%

Simulation of liquid cone formation on the tip apex of indium field emission electric propulsion thrusters

SUN 孙,

DENG 邓,

LIU 刘

et al. 2024

Plasma Sci. Technol.

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Study of microchannel structures for measuring emission conductance of indium field emission electric propulsion micro-thrusters

Zhong,

Liu,

et al. 2024

Measurement

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Fabrication of porous emitters for ionic liquid ion source by wire electrical discharge machining combined with electrochemical etching

Liu

Kang

et al. 2019

Review of Scientific Instruments

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Ionic liquid ion source (ILIS) is a promising ion source, which can be applied to space propulsion, microfabrication, and surface modification. Fabrication of high-quality ILIS emitters is one of the key technologies for the application of ILIS. A new method is proposed for the fabrication of porous emitters with a designed shape. This method uses wire electrical discharge machining (WEDM) combined with electrochemical etching, and the porous emitter is fabricated by two steps. First, the porous metal is machined by WEDM to get the external geometry of the emitter. Then, electrochemical etching is employed to remove the recast layer. A series of experiments has been conducted to find the appropriate machining parameters. Experiments reveal that sharp porous emitter tips for the ILIS can be fabricated by WEDM combined with electrochemical etching at 5 V etching voltage. Moreover, the apex curvature radius of the emitter is controllable by adjusting the etching time. It is found that the apex curvature radius varies from 4.5 μm to 18.4 μm when increasing etching time from 40 s to 120 s at 5 V etching voltage. Those emitters have been applied to ILIS tests, and their I-V characteristics are investigated. Furthermore, this method has been used to machine dense fields of emitters. A 1 cm2 emitter array chip integrated with 676 emitters has been successfully machined, and the I-V characteristic curve of the emitter array chip is also achieved.

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Note: Fabrication of roughened tips for liquid metal ion sources

Cited by 4 publications

References 13 publications

Simulation of liquid cone formation on the tip apex of indium field emission electric propulsion thrusters

Simulation of liquid cone formation on the tip apex of indium field emission electric propulsion thrusters

Study of microchannel structures for measuring emission conductance of indium field emission electric propulsion micro-thrusters

Fabrication of porous emitters for ionic liquid ion source by wire electrical discharge machining combined with electrochemical etching

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