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Analysis of counter flow of corona wind for heat transfer enhancement

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Abstract

A heat sink for cooling devices using the counter flow of a corona wind was developed in this study. Detailed information about the numerical investigations of forced convection using the corona wind was presented. The fins of the heat sink using the counter flow of a corona wind were also investigated. The corona wind generator with a wire-to-plate electrode arrangement was used for generating the counter flow to the fin. The compact and simple geometric characteristics of the corona wind generator facilitate the application of the heat sink using the counter flow, demonstrating the heat sink is effective for cooling electronic devices. Parametric studies were performed to analyze the effect of the counter flow on the fins. Also, the velocity and temperature were measured experimentally for the test mock-up of the heat sink with the corona wind generator to verify the numerical results. From a numerical study, the type of fin and its optimal height, length, and pitch were suggested for various heat fluxes. In addition, the correlations to calculate the mass of the developed heat sink and its cooling performance in terms of the heat transfer coefficient were derived. Finally, the cooling efficiencies corresponding to the mass, applied power, total size, and noise of the devices were compared with the existing commercial central processing unit (CPU) cooling devices with rotor fans. As a result, it was confirmed that the heat sink using the counter flow of the corona wind showed appropriate efficiencies for cooling electronic devices, and is a suitable replacement for the existing cooling device for high power electronics.

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Abbreviations

Vc :

Onset voltage [kV]

E:

Electric field intensity [V/m]

q:

Space charge [C]

є:

Dielectric permittivity

D:

Diffusivity coefficient of ions

U:

Velocity of air flow [m/s]

K:

Ion mobility

J:

Current density [A/cm3]

μ:

Coefficient of viscosity [N·s/m2]

fe :

Coulomb force [N]

p:

Pressure [Pa]

h:

Heat transfer coefficient [W/m2·K]

Ts :

Surface temperature [°C]

T∞ :

Ambient temperature [°C]

ρ:

Density of air [g/cm3]

λ:

Thermal conductivity [W/m·k]

he :

Enthalpy [kcal]

htot :

Total enthalpy [kcal]

τ:

Friction [N]

U :

Velocity vector of flow

q ,, :

Heat flux [W/m2]

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Acknowledgements

This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Korean government (MEST) (2016R1A2B4011087).

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Authors and Affiliations

  1. School of Mechanical Engineering, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, 16419, Republic of Korea

    Dong Ho Shin, Soo Hong Baek & Han Seo Ko

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  1. Dong Ho Shin
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  2. Soo Hong Baek
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Correspondence to Han Seo Ko.

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Shin, D.H., Baek, S.H. & Ko, H.S. Analysis of counter flow of corona wind for heat transfer enhancement. Heat Mass Transfer 54, 841–854 (2018). https://doi.org/10.1007/s00231-017-2183-4

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