3D Numerical Simulation of Heat Transfer of a Heated Plate under the Electric Field Generated by a Needle Electrode

Zhang, Jianfei; Zhao, Chuang-Yao; Li, Hongyan; Tao, Wen‐Quan

doi:10.1155/2014/354180

Cited by 4 publications

(3 citation statements)

References 22 publications

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“…Examples of 3D analysis of EHD problem are scarce but not absent. In [14] such problem was solved with COMSOL Multiphysics in pin-to-plane configuration, but unfortunately the details of handling sharp electrode geometry were not clarified. Corona discharge problem with uncommon configuration of electrodes was solved with COMSOL Multiphysics in [15].…”

Section: Nomenclaturementioning

confidence: 99%

Numerical modeling of body force induced by corona discharge

Gałek

2017

ZN PRz Mechanika

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The paper presents the theoretical basis and results of numerical modeling of corona discharge phenomenon carried out to determine the value of body force that induces the flow of surrounding fluid. The system of two partial differential equations is solved with the values of electric potential ϕ and space charge density ρq as unknowns. The first equation is of Poisson-type with Laplacian acting on the value of potential and source term dependent on space charge density as well as electric permittivity of the medium. The second equation is current continuity equation, where the current density is composed of charge carrier diffusion term and the term describing their drift in electric field. Particular attention was given to the boundary condition of space charge density due to its indirect nature. Geometry of the problem assumes that positive corona discharge takes place on the sharp edge of the blade-shaped anode while flat grounded plate acts as a cathode. Such configuration enables simplified analysis in 2D Cartesian coordinates assuming that the section plane is sufficiently far from the lateral edges of the blade. The system of equations is solved with MOOSE (Multiphysics Object-Oriented Simulation Environment) Framework released in public domain on GNU LGPL license by Idaho National Laboratory. Presented results include 2D distributions of electric potential, electric field strength, space charge density and body force in air surrounding electrodes.

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Section: Nomenclaturementioning

confidence: 99%

Numerical modeling of body force induced by corona discharge

Gałek

2017

ZN PRz Mechanika

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“…Several studies exist on solidstate fans with different structures, including needleplate, wire-pipe, needle-pipe, and so on. [7][8][9][10][11] All studies show that the solid-state fan can significantly enhance heat transfer. With regard to the wire-plate solid-state fan, Tada et al 12 examined heat transfer, applying solidstate fans with electrodes between two plates.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of a wire–plate solid-state fan for ultra-quiet museum display cases

Chen

Zheng

et al. 2019

Indoor and Built Environment

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Conventional microenvironment control systems of a museum display case generally use mechanical fans which produce great noise and vibration for heat dissipation of semiconductor air-conditioning units. Solid-state fans (ionic wind) operate with no moving parts and can overcome noise and vibration issues of a microenvironment control system. In this study, a multi-electrode mathematical and physical model of wire–plate solid-state fans was developed, and its performance has been analysed in depth. Simulation results indicate that there is an optimal distance between discharge electrodes ( d), which corresponds to the largest average wind velocity at the exit of the simulation area ( ua). Under the same power consumption, ua and the vertical height from a discharge electrode to a collecting electrode ( H) exhibit a monotonically increasing relationship. Similarly, ua and the radius of a discharge electrode ( r) show a monotonically decreasing relationship. In addition, a manufactured solid-state fan with an average wind velocity of 1.48 m·s−1 shows a noise intensity of 4.3 dB(A), which is considerably lower than that of a mechanical fan, with the same power consumption. These positive results suggest that ultra-quiet microenvironment control technologies of a museum display case can be potentially developed in the near future.

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“…In 2008, researchers at the KTH Royal Institute of Technology in Stockholm, Sweden, employed the finite element and transient solution methods to evaluate the nonlinear electric field distribution; however, the method was inefficient, and the accuracy of the solution was low [14,15]. In 2014, Zhang et al [16] applied the finite element and multi field modeling methods to calculate the electric field and loss density distribution of the corona protection layer at the end of the stator bar in a large generator. The results were then compared to those obtained using the resistance capacitance chain algorithm to provide a basis for further development of an optimal calculation model.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Electric Field Distribution at the End of the Stator in a Large Generator

Zhang

et al. 2018

Energies

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The electric field distribution at the end of a large hydro-generator is highly nonuniform and prone to corona discharge, which damages the main insulation and significantly reduces the service life of the hydro-generator. In order to reduce the thickness of the main insulation and the physical size of a large hydro-generator, it is necessary to understand the distribution of the electric field at the end of its stator bar. In this paper, the stator bar at the end of a large generator is simulated using the finite element method to determine the distribution of the potential, electric field, and loss at the rated voltage, as well as to elucidate the differences between the linear corona protection, two-segment nonlinear corona protection, and three-segment nonlinear corona protection structures. The influences of the arc angle, length of each corona protection layer, intrinsic resistivity of the corona protection material, and nonlinear coefficient are also analyzed. The results manifest that the angle of the stator bar should be 22.5 • , the difference in resistivity between the two adjacent corona protection coatings should not exceed two orders of magnitude, and the resistivity of the medium resistivity layer should be nearly 10 6 Ω·m or 10 7 Ω·m, for an optimal design of the corona protection structure.

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3D Numerical Simulation of Heat Transfer of a Heated Plate under the Electric Field Generated by a Needle Electrode

Cited by 4 publications

References 22 publications

Numerical modeling of body force induced by corona discharge

Numerical modeling of body force induced by corona discharge

Numerical simulation of a wire–plate solid-state fan for ultra-quiet museum display cases

Optimization of the Electric Field Distribution at the End of the Stator in a Large Generator

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