A study of heat transfer enhancement via corona discharge by using a plate corona electrode

Tsui, Yeng-Yung; Huang, Yu; Lan, Chao Cheng; Wang, Chi-Chuan

doi:10.1016/j.elstat.2017.02.003

Cited by 37 publications

(16 citation statements)

References 22 publications

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“…Furthermore, the heat transfer resulting from corona discharge was examined in [4] using a thin plate as the corona electrode, while the collecting electrode is formed by grounding the heated plate. The experiments conducted in [4] reveal that the heat transfer coefficient at the center of the heated plate is increased by a factor in the range 2.6 -4.8 times as compared to that of natural convection.…”

Section: Simulation Of Corona Dischargementioning

confidence: 99%

“…Two regions can be identified in the air gap between the two electrodes: a lower field drifts region and a high field ionization region [3]. The corona voltage ranges from 6 to 19 kV, depending on the inter-electrode gaps [4]. The atmosphere, conductor size, and the spacing between the conductors are among the factors that affect corona discharge.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Corona Discharge Problem Based on Different Computational Approaches of Dimensional Analysis

Oladigbolu

Rushdi

2020

JERR

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Although corona discharge is notorious for its detrimental effects, it is also used in many beneficial practical applications. Despite the existence of a variety of sophisticated theoretical and experimental methods for investigating corona discharge, we explore yet a much simpler method that relies on the use of Dimensional Analysis (DA). The DA method does not demand profound knowledge of the underlying phenomenon or its governing equations, as it only needs the correct identification of the variables influencing the phenomenon, and the specification of their physical dimensions. The classical and well-known Gauss-Jordan elimination method is compared with other matrix-oriented computational approaches in analyzing the pertinent dimensional system. This method relies upon solution-preserving elementary row operations, i.e., operations that one can use on a matrix without spoiling the solution set for an associated matrix equation. A distinct advantage of this method is that it does not pre-suppose a particular value of the matrix rank but tackles the task of determining this rank while proceeding towards its ultimate result. Moreover, this method can also be used to find the inverse of a regular (invertible) matrix or to determine the solution (if any) of a system of linear equations. As a bonus, novel results of numerical investigations of bases, regimes, and dimensionless products are extensively presented in this paper. A remarkable observation made herein is that the set of variables pertinent for a particular phenomenon cannot be arbitrarily partitioned into basis (input) variables and regime (output or isolated) variables. The paper running example deals with expressing a specific variable, viz. ozone generation rate per unit length of wire (r0) through dimensionless products in terms of a set of determining or influencing variables.

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Section: Simulation Of Corona Dischargementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of the Corona Discharge Problem Based on Different Computational Approaches of Dimensional Analysis

Oladigbolu

Rushdi

2020

JERR

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“…The temperature field (T) in the air-filled region and at the copper plate was calculated to determine the rate of heat flux. Dissipation Equations (14) and (15) govern the temperature field in the air-filled and the copper-filled regions, respectively. Boundary condition (16) was used at the surface of the heater block and the needle.…”

Section: Numerical Simulationmentioning

confidence: 99%

“…It is worth mentioning that heat transfer enhancement by using ionic wind devices has been studied for decades [10][11][12][13][14][15][16][17][18][19]. For example, [18] showed that ionic wind induced by a wire-type discharge electrode enhanced the heat transfer between two of the surfaces that face each other of a rectangular duct (the duct had a primary airstream).…”

Section: Introductionmentioning

confidence: 99%

Fundamental Evaluation of Thermal Switch Based on Ionic Wind

Yoshida

2019

Energies

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A significant amount of thermal energy (mainly under 200 °C) is wasted in the world. To utilize the waste heat, efficient heat management and thermal switching is required. The basic characteristics of a thermal switch that controls the flow of heat by switching on/off the ionic wind is discussed in this study. The study was conducted through experiments and numerical simulations. A heater made of aluminum block maintained at 100 °C was used as a heat source, and the rate of heat flow to a copper plate placed over it was measured. Ionic wind was induced by corona discharge with a needle placed on the heater. The ratio of heat transfer coefficients was obtained in the range of 3–4, with an energy efficiency of around 10. The heat flux at this condition was approximately 400 W/m2. The numerical simulations indicate that the heat transfer is enhanced by ionic winds, and the results were found to corroborate well with the experimental ones.

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“…Power measurements are made for 2 voltage multipliers and 4 corona discharge ceramic plates. About 90 % of the power supplied to the generator is being utilized to produce light, sound and primary heat [7].…”

Section: Fig 2 Corona Discharge Ceramic Plate Placement and Variablmentioning

confidence: 99%

Improvement of cooling system of electrical equipment using simulation of airflow and heat transfer

Galins

Laizans

Galins

2018

Engineering for Rural Development

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The research is devoted to the results of air flow and heat transfer simulation application in the design of compact electrical equipment with the aim of increasing the efficiency of the cooling system. The design of electrical equipment involves not only the creation of an ergonomic, attractive shape, but also to the solutions to overheating problems. Excessive heat is to be emitted to the environment, and for small size devices the necessity is the properly designed accelerated air flow through the system. In order to find out the high risk areas in the device, which are under the risk of substantial overheating due to inadequate air flow intensity, the simulation model of airflow and heat transfer processes for the particular device was developed in the Solidworks software. The experimental device with the axial fan used for air flow supply to the heated areas was made to evaluate the temperature and air flow velocity. Comparison of the experimental and simulation results showed that the simulated air flow speed is describing the real situation with the experimental flow measurements in the device with 91 % coincidence. Temperature measurements differed from the simulations only by 7 % in some areas, but the distribution pattern remained. Studies of the air flow trajectory and speed revealed the tendency of negative intercorrelation of the air flow rate and the surface temperature.

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A study of heat transfer enhancement via corona discharge by using a plate corona electrode

Cited by 37 publications

References 22 publications

Investigation of the Corona Discharge Problem Based on Different Computational Approaches of Dimensional Analysis

Investigation of the Corona Discharge Problem Based on Different Computational Approaches of Dimensional Analysis

Fundamental Evaluation of Thermal Switch Based on Ionic Wind

Improvement of cooling system of electrical equipment using simulation of airflow and heat transfer

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