Experimental and numerical investigation of electrohydrodynamic flow in a point-to-ring corona discharge

Guan, Yifei; Vaddi, Ravi Sankar; Aliseda, Alberto; Novosselov, Igor

doi:10.1103/physrevfluids.3.043701

Cited by 41 publications

(27 citation statements)

References 42 publications

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“…20,22,28,40 In the context of the EHD flow model development, two observations on the ionization region are important. First, the ionization process is assumed to occur only in the region where the electric field strength is greater than a threshold value E i % 3 Â 10 6 V=m; 17,41 thus, the ionization is limited to a small region near the anode. The ionization region length scale-b can be approximated by u 0 E i , where u 0 is the anode voltage.…”

Section: A Voltage-current Relationshipmentioning

confidence: 99%

“…where q c is the charge density, u is the velocity vector of the bulk flow, E is the electric field vector, l b is the effective ion mobility, which is approximated as a constant (2:0 Â 10 À4 m 2 =Vs) at atmospheric pressure and room temperature (300 K), 5,9,41,43,44 (this constant is likely to have different values for negative corona or corona in other gases), and D c is the ion diffusivity, described by the electrical mobility equation…”

Section: A Voltage-current Relationshipmentioning

confidence: 99%

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Analytical model of electro-hydrodynamic flow in corona discharge

et al. 2018

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We present an analytical model for electro-hydrodynamic flow that describes the relationship between the corona voltage, electric field, and ion charge density. The interaction between the accelerated ions and the neutral gas molecules is modeled as an external body force in the Navier-Stokes equation. The gas flow characteristics are solved from conservation principles with spectral methods. This multiphysics model is shown to match experimental data for a point-to-ring corona configuration, shedding new insights into mass, charge, and momentum transport phenomena, and can be readily implemented in any numerical simulation.

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Section: A Voltage-current Relationshipmentioning

confidence: 99%

Section: A Voltage-current Relationshipmentioning

confidence: 99%

Analytical model of electro-hydrodynamic flow in corona discharge

et al. 2018

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“…The analytical study has been extended to determine the voltage-thrust relationship in planar coordinates with and without considering viscous losses and has good agreement with experiments [23] and previous work [24,25]. Previous studies have reported that maximum velocity for point-to-ring electrode configuration was recorded at 9 m/s [26] and have assessed the use of ionic winds in propulsion applications [24].…”

Section: Corona Discharge Driven Flowmentioning

confidence: 63%

“…The analysis sheds insight into the importance of the electrode distance and applied voltage. Eq 4 shows that for the larger electrode spacing higher efficiency values can be reached as observed by Guan et al [26]. Related to electrode configuration, it is important to revisit Townsend's relations [31]…”

Section: Plos Onementioning

confidence: 83%

A laser-microfabricated electrohydrodynamic thruster for centimeter-scale aerial robots

et al. 2020

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To date, insect scale robots capable of controlled flight have used flapping-wings for generating lift, but this requires a complex and failure-prone mechanism. A simpler alternative is electrohydrodynamic (EHD) thrust, which requires no moving mechanical parts. In EHD, corona discharge generates a flow of ions in an electric field between two electrodes; the high-velocity ions transfer their kinetic energy to neutral air molecules through collisions, accelerating the gas and creating thrust. We introduce a fabrication process for EHD thruster based on 355 nm laser micromachining, which potentially allows for greater materials selection, such as fiber-based composites, than is possible with semiconductor-based lithographic processing. Our four-thruster device measures 1.8 × 2.5 cm and is composed of steel emitters and a lightweight carbon fiber mesh. We measured the electrical current and thrust of each thruster of our four-thruster design, showing agreement with the Townsend relation. The peak thrust of our device, at 5.2 kV, was measured to be 3.03 times its 37 mg (363.0 μN) mass using a precision balance. In free flight, we demonstrated liftoff at 4.6 kV.

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“…29, the flow becomes unstable developing EC vortices which are maintained by an electric force acting on the ionized fluid --a combination of applied electric field and the space charge effect. The space charge effect can alter the applied electric field in the area of high charge density [41]. FIG.…”

Section: Electroconvection Instabilitymentioning

confidence: 99%

Two relaxation time lattice Boltzmann method coupled to fast Fourier transform Poisson solver: Application to electroconvective flow

Guan

Novosselov

2019

Journal of Computational Physics

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I. ABSTRACTElectroconvective flow between two infinitely long parallel electrodes is investigated via a multiphysics computational model. The model solves for spatiotemporal flow properties using two-relaxation-time Lattice Boltzmann Method for fluid and charge transport coupled to Fast Fourier Transport Poisson solver for the electric potential. The segregated model agrees with the previous analytical and numerical results providing a robust approach for modeling electrohydrodynamic flows. II.

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Experimental and numerical investigation of electrohydrodynamic flow in a point-to-ring corona discharge

Cited by 41 publications

References 42 publications

Analytical model of electro-hydrodynamic flow in corona discharge

Analytical model of electro-hydrodynamic flow in corona discharge

A laser-microfabricated electrohydrodynamic thruster for centimeter-scale aerial robots

Two relaxation time lattice Boltzmann method coupled to fast Fourier transform Poisson solver: Application to electroconvective flow

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