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A novel spray cooling device based on a dual synthetic jet actuator integrated with a piezoelectric atomizer

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Abstract

To solve the heat dissipation problem of electronic equipment, a novel spray cooling device based on a dual synthetic jet actuator integrated with a piezoelectric atomizer (DSJAPA) is proposed and designed. The flow field, spray characteristics and cooling performance of DSJAPA are investigated experimentally. The experimental results show that the spray angle increases with the increase of driving voltage, and it can achieve the maximum of 74°. Under a certain driving voltage, there exists an optimum driving frequency making the spray angle reach to the maximum. The spray flow field is investigated by droplet image velocimetry (PIV) system. The results show that the spray droplet velocity can be accelerated to about 22.5 m/s by the high-speed ejection of the jet. With the increase of dual synthetic jet velocity, the dense spray with low velocity changes into the dilute spray with high velocity. A dual synthetic jet actuator can improve the cooling capability of spray, reduce the temperature non-uniformity of surface (from 32 °C in spray cooling to 18 °C in DSJAPA cooling) and enlarges the direct impingement range (from (−30 mm, 25 mm) in spray cooling to (−60 mm, 57 mm) in DSJAPA cooling).

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Abbreviations

A :

area of the heated plate (m2)

A 0 :

peak vibration velocity (m/s)

a :

acceleration (mm/s2)

d e :

characteristic scale (mm)

f :

driving frequency (Hz)

f r :

resonance frequency (Hz)

h :

heat transfer coefficient (W/m2·K)

I :

current (A)

L :

distance (mm)

Q ele :

input power (W)

Nu :

Nusselt number

Q loss :

total heat loss (W)

q conv :

heat flux (W/m2)

T :

a cycle of DSJAPA (s)

T in :

inlet temperature of water (°C)

T surf :

surface temperature (°C)

t :

time (s)

V :

voltage (V)

λ :

thermal conductivity of air (W/m·K)

σ :

poisson’s coefficient

ρ :

density (kg/m3)

DSJA:

dual synthetic jet actuator

PIV:

particle image velocimetry

PZT:

piezoelectric

SJA:

synthetic jet actuator

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Acknowledgements

The authors would like to thank the National Natural Science Foundation of China (Grant Numbers 11572349, 11602299, 11872374) and the Natural Science Foundation of National University of Defense Technology (Grant Number ZK18-03-11) for the financial support.

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Authors and Affiliations

  1. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, 410073, People’s Republic of China

    Wei He, Zhenbing Luo, Xiong Deng & Zhixun Xia

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  1. Wei He
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  2. Zhenbing Luo
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  3. Xiong Deng
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  4. Zhixun Xia
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Correspondence to Zhenbing Luo or Xiong Deng.

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He, W., Luo, Z., Deng, X. et al. A novel spray cooling device based on a dual synthetic jet actuator integrated with a piezoelectric atomizer. Heat Mass Transfer 56, 1551–1563 (2020). https://doi.org/10.1007/s00231-019-02804-w

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