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Numerical simulation and optimization of ionic wind heat sink with needle-fin electrode

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Thermophysics and Aeromechanics Aims and scope

Abstract

In this paper, the characteristics of the electric field, flow field, and temperature field of ionic wind heat sink are studied, respectively. The results show that the heat sink achieves the best performance when the ratio of fin spacing to thickness is 5, the electrode spacing is 5 mm, and the needle position is 0. Furthermore, a two-stage structure ionic wind heat sink is proposed and optimized. The optimized average wind velocity increased by 30.8 % to 3.57 m/s compared to the single-stage structure. This work enriches the knowledge of electrode configuration and promotes the application of ionic wind heat sinks.

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Abbreviations

A :

area of radiation surface, m2

A out :

area of ionic wind outlet, m2

d :

stage spacing, mm

d fin :

fin spacing, mm

d outlet :

the reserved air gap at the outlet of the numerical model, mm

μ E :

ionic mobility, m2/(V·s)

σ 2 :

wind velocity variance

ρ q :

space charge density, C/m3

r :

curvature radius of emitter electrode, mm

ε 0 :

vacuum dielectric constant

μ :

dynamic viscosity, N·s/m2

E :

electric field strength, V/m

e :

elementary charge, C

Re:

Reynolds number

F EHD :

electric field force of electro-hydrodynamics, N

λ :

fluid thermal conductivity, W/(m·K)

h :

coefficient of convective heat transfer, W/(m2·K)

ΔT :

temperature difference between cooled surface and environment, °C or K

W fin :

width of Fin Electrode in 2D Model, m

z q :

charge number

J :

current density, A/m2

T i :

ion temperature, °C

E 0 :

breakdown threshold of the electric field, V/m

p :

pressure, Pa

T :

heat source temperature during the experiment, °C or K

T 0 :

reference temperature (ambient temperature), °C or K

Nu:

Nusselt number

ΔT drop :

temperature drop, °C

u :

ionic wind velocity, m/s

V :

working voltage, kV

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Authors and Affiliations

  1. Guangdong University of Technology, Guangdong, Guangzhou, China

    J. Cai, Ch. Wang & Y. Hu

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  1. J. Cai
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  2. Ch. Wang
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  3. Y. Hu
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Corresponding author

Correspondence to Ch. Wang.

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The authors declared that there is no conflict of interest.

The authors gratefully acknowledge the financial support for this research from the International Science and Technology projects of Huangpu District of Guangzhou City (2019GH02), the National Natural Science Foundation of China (51676049).

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Cai, J., Wang, C. & Hu, Y. Numerical simulation and optimization of ionic wind heat sink with needle-fin electrode. Thermophys. Aeromech. 30, 49–68 (2023). https://doi.org/10.1134/S0869864323010079

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  • DOI: https://doi.org/10.1134/S0869864323010079

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