Swirling flow structures in electrostatic precipitator

Ullum, Thorvald Uhrskov; Larsen, Poul Scheel

doi:10.1007/s10494-005-6772-9

Cited by 5 publications

(2 citation statements)

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“…The current density with rotational component created vortices in the fluid. The modified vorticity equation and the Navier‐Stokes equation are shown as Equations and .

\frac{\partial ω_{i}}{\partial x_{i}} = 0,

ρ ([], \frac{\partial ω_{i}}{\partial t} + v_{j} \frac{\partial ω_{i}}{\partial x_{j}}) = μ \frac{\partial^{2} ω_{i}}{\partial x_{j}^{2}} + ω_{i} \frac{\partial v_{i}}{x_{j}} - \frac{1}{α} ε_{ijk} \frac{\partial R_{k}}{\partial x_{j}},

where ω i is the vorticity, ρ is the fluid density, v i ( v j ) is the velocity, μ is the absolute viscosity, α is the ion mobility, and

- \frac{1}{α} ε_{ijk} \frac{\partial R_{k}}{\partial x_{j}}

is the rotational component.…”

Section: Resultsmentioning

confidence: 99%

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Enhanced ionic wind generation by graphene for LED heat dissipation

et al. 2019

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Summary High voltage is an obstacle when applying electrohydrodynamics technology. Nanomaterials are good candidates for its extraordinary electrical properties and heat‐conducting characteristics. An originally designed ionic wind cooling system was secured with graphene using the dip‐coating method to study the cooling effect for the high‐power light‐emitting diodes. The experiment results indicated that the graphene on the needles' surface acted as new emitting electrode with a smaller curvature radius. The corona discharge current density increased, and the ionic wind inception voltage decreased, because of the high aspect ratios and the field emission characteristic of graphene. The maximum ionic wind volume velocity was improved by 41.3% when the discharge gap was 10 mm, which was attributed to the local electric field enhancement and the electron field emission effect that the graphene had. The best cooling performance was obtained when the needles and the heat sink were both coated with graphene. The junction temperature decreased 21%, and the luminous flux increased 5.6% at the discharge gap of 15 mm, taking the electrostatic screening effect into consideration.

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“…The current density with rotational component created vortices in the fluid. The modified vorticity equation and the Navier‐Stokes equation are shown as Equations and .

\frac{\partial ω_{i}}{\partial x_{i}} = 0,

ρ ([], \frac{\partial ω_{i}}{\partial t} + v_{j} \frac{\partial ω_{i}}{\partial x_{j}}) = μ \frac{\partial^{2} ω_{i}}{\partial x_{j}^{2}} + ω_{i} \frac{\partial v_{i}}{x_{j}} - \frac{1}{α} ε_{ijk} \frac{\partial R_{k}}{\partial x_{j}},

where ω i is the vorticity, ρ is the fluid density, v i ( v j ) is the velocity, μ is the absolute viscosity, α is the ion mobility, and

- \frac{1}{α} ε_{ijk} \frac{\partial R_{k}}{\partial x_{j}}

is the rotational component.…”

Section: Resultsmentioning

confidence: 99%

“…Ullnm found that the EFA of “multineedles‐to‐plate” structure caused a large‐scale secondary flow, which would rotate in an unstable form along the axial of the emitting electrode to cause high intensity turbulence and axial velocity.…”

Section: Resultsmentioning

confidence: 99%