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Effect of transverse synthetic jet on heat transfer characteristics of the heat sink situated in a rectangular channel with axial main flow

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Abstract

This study experimentally investigated the heat transfer characteristics of the heat sink situated in a rectangular channel with the axial main flow under a transverse synthetic jet. The heat sinks, made of aluminum alloy, were divided into three kinds: the finned heat sinks, the in-line pin-fin heat sinks and the pure aluminum-foam heat sink. Total 7 heat sinks were used as test specimens. There was a fixed bypass space between the heat sink and the upper cover of the channel. The synthetic-jet device was separately placed above the leading edge of heat sink, normally above the heat sink and above the trailing edge of heat sink. Under current test parameters, the heat transfer capability of the system with the synthetic jet was around four times that without the synthetic jet. When the value of Rej/Re was bigger than 2.4, the synthetic jet would enhance the heat transfer of the present cooling system above 50%. The cases with the smaller diameter of synthetic-jet nozzle had the better heat transfer enhancement. The Nusselt number of the pure aluminum-foam heat sink was the lowest, and its heat transfer was lower than that of the highest group by 30 ~ 40%.

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Abbreviations

A :

heating surface area [m2]

d :

diameter of the synthetic-jet nozzle [m]

f :

frequency of input electric voltage to the synthetic-jet device [Hz]

H :

height of the channel [m]

I :

input electric current to the film heater [A]

k :

thermal conductivity [W/m·K]

L :

length of the heat sink [m]

Nu :

Nusselt number, Eq. (3).

Q flow :

volumetric flow rate of the synthetic jet [m3/s]

Q :

heat [W]

Re :

Reynolds number, Eqs. (1) and (2)

T :

temperature [°C]

U :

average velocity of main flow in the channel [m/s]

V :

input electric voltage to the film heater [V] or jet velocity [m/s]

V rms :

input root-mean-square electric voltage to the synthetic-jet device [V]

ε :

porosity

μ :

density [kg/m3]

ρ :

dynamic viscosity [N-s/m2]

0 :

without synthetic jet

f :

fluid

i :

at the channel inlet

j :

synthetic jet

loss :

heat loss

t :

total

w :

heated wall

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Acknowledgements

The authors would like to thank the Ministry of Science and Technology of the Republic of China for financially supporting this research under Contract Nos. MOST 107-2221-E-270-003-MY2, MOST 107-2637-E-270-001, MOST 107-2622-E-270-003-CC3.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Chienkuo Technology University, Taiwan, Republic of China

    Tzer-Ming Jeng, Sheng-Chung Tzeng & Yi-Chun Li

  2. Department of Mechanical Engineering, National Chung Hsing University, Taichung, 402, Taiwan, Taiwan, Republic of China

    Ching-Wen Tseng

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  1. Tzer-Ming Jeng
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  2. Sheng-Chung Tzeng
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  4. Yi-Chun Li
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Correspondence to Sheng-Chung Tzeng.

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Jeng, TM., Tzeng, SC., Tseng, CW. et al. Effect of transverse synthetic jet on heat transfer characteristics of the heat sink situated in a rectangular channel with axial main flow. Heat Mass Transfer 57, 1145–1159 (2021). https://doi.org/10.1007/s00231-020-02987-7

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