Extraction process of charged droplets in ultrasonic electric propulsion system: An experimental study

He, Weiguo; Kang, Xiaoming; Yu, Bo; Liu, Xinyu; Guo, Dan; Hang, Guanrong; Zhao, Weiguang

doi:10.1177/0954410019836916

Cited by 3 publications

(3 citation statements)

References 39 publications

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“…The formation mechanism of the multiple-emission modes is the combination effects of the thickness of liquid film, formation of CSWs, and electrostatic effects. Though the images of the partial formation of CSWs without applying an electric field were captured in the previous work [20], it cannot be concluded that the partial formation of CSWs results in partial emission plumes.…”

Section: Partial Emission Of Charged Droplets On the Right Side Of Th...mentioning

confidence: 95%

“…In contrast, the other two-thirds of the emission surface on the right side does not emit droplets. This phenomenon is first revealed by the high-speed imaging system, though experimental results have indicated partial formation of CSWs on the emission surface [20]. The DPEs imply two possibilities regarding the liquid film: first, the liquid film on the emission surface has an uneven thickness, which causes the DPEs on the emission surface; second, even though the liquid film covers the entire emission surface, the CSWs only form on a portion of it, which causes the DPEs in the UEP system.…”

Section: Partial Emission Of Charged Droplets On the Left Side Of The...mentioning

confidence: 98%

“…Due to these factors, no research has been done on DPEs in the UEP system. Recent research about the UEP system mainly focused on the divergence angle of thrust and energy efficiency between the design and test outcomes of the UEP thruster [18], the micro thrust measurements of the UEP system with different operation conditions [19], and the formation mechanism of the CSWs in the UEP system [20].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Preliminary study of the electrospray DPE peculiarities from the liquid surface in the presence of the CSWs

HE 贺,

HUO 霍,

HAN 韩

et al. 2024

Plasma Sci. Technol.

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The Ultrasonic Electric Propulsion (UEP) system is a cutting-edge propulsion technology that is mostly used on platforms for small satellites (less than 10 kg). The characteristics of droplet partial emissions (DPEs) in the UEP system are investigated using a high-speed imaging technique (an ultra-high speed camera (NAC HX-6) and a long-distance microscope) in this work. The experiments demonstrate that there are a few partial emission modes, including left-side emission, double-side emission, and right-side emission, that are present in the droplet emission process of the UEP system. These modes are primarily caused by the partial formation of capillary standing waves (CSWs) on the emission surface of the ultrasonic nozzle. The emission rate for single- and double-sided emissions varies at different times, indicating that there are different CSWs engaged in droplet emission due to variations in the liquid film thickness and charge state of the liquid cones. Additionally, as the droplets emit continuously, a raised area on the emission surface appears, with several droplets emitting there as a result of charge accumulation. Additionally, photos of the CSWs with emitting droplets are obtained, which highlights the CSWs’ distinctive wave morphology.

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Section: Partial Emission Of Charged Droplets On the Right Side Of Th...mentioning

confidence: 95%

Section: Partial Emission Of Charged Droplets On the Left Side Of The...mentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preliminary study of the electrospray DPE peculiarities from the liquid surface in the presence of the CSWs

HE 贺,

HUO 霍,

HAN 韩

et al. 2024

Plasma Sci. Technol.

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Temporal instability of a viscous liquid film on an oscillating plane in the presence of static electric field

Deng

Wang²,

Shi

et al. 2023

AIP Advances

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This work examined the linear instability of a two-dimensional liquid film on an oscillating plane theoretically in the presence of a static electric field perpendicular to the plane. The liquid was considered to be viscous and perfectly conducting, while the gas was considered to be viscous and dielectric. The viscous potential theory and Floquet theory were adopted to obtain the dispersion equation. The influences of electric field intensity, forcing amplitude, forcing frequency, and viscosity were obtained. The results showed that with there is more than one instability region with a non-zero forcing amplitude. The first instability region is called inherent instability, which is due to the electric force overcoming the viscous dissipation, surface tension, and gravity, while the other regions are due to the parametric instability induced by the oscillating plane, forming famous Faraday waves. It was found that increasing the forcing amplitude stabilizes the inherent instability but has a destabilizing impact on Faraday waves. In addition, the increase in the electric field intensity and forcing frequency enhances the inherent instability but has a complex impact on the Faraday waves, depending on the intensity of the viscous dissipation, which is approximately proportional to the square of the wavenumber.

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Linear instability of a two-dimensional viscoelastic liquid film under the coupling effect of electrostatic field and parametric resonance

Jia,

Wang,

Yang

et al. 2023

Physics of Fluids

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A two-dimensional temporal linear instability analysis is performed for a charged liquid viscoelastic film on a vertically oscillating plane in the presence of an electrostatic field. The viscoelastic fluid, described by the Oldroyd-B model, is intended to be a Taylor–Melcher leaky dielectric, while the ambient gas is treated as perfectly dielectric. Results show that the oscillations induce parametric unstable regions. The parametric unstable regions can be superimposed on the inherent unstable region when the oscillation frequency is small because the frequency in the inherent unstable region is non-zero. The electric field has a complex effect on both inherent and parametric instabilities. The effect of the electrical relaxation time is dominated by the electrical Bond number and dimensionless distance. The relative permittivity has a destabilizing effect. However, the effects of electrical relaxation time and relative permittivity in the parametric unstable region are negligible. The viscosity and elasticity have non-monotonic effects on the inherent instability but have a monotonous effect on the parametric instability. The increase in Bond number has a stabilizing effect. The effect of density ratio is not constant in the inherent unstable region according to the electrical Bond number and Bond number. However, the increase of density ratio has a monotonously stabilizing effect on the parametric instability.

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Extraction process of charged droplets in ultrasonic electric propulsion system: An experimental study

Cited by 3 publications

References 39 publications

Preliminary study of the electrospray DPE peculiarities from the liquid surface in the presence of the CSWs

Preliminary study of the electrospray DPE peculiarities from the liquid surface in the presence of the CSWs

Temporal instability of a viscous liquid film on an oscillating plane in the presence of static electric field

Linear instability of a two-dimensional viscoelastic liquid film under the coupling effect of electrostatic field and parametric resonance

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