Investigation of a piezoelectric fan embedded in a heat sink

Ma, Hwong‐Wen; Su, Hung-Wen; Liu, C.L.; Ho, Wei-chuan

doi:10.1016/j.icheatmasstransfer.2012.03.003

Cited by 52 publications

(16 citation statements)

References 17 publications

(15 reference statements)

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“…However, most electronic devices use forced convection electric fan cooling because of cost issues. Recently, some researchers [1][2][3][4] have investigated piezoelectric fans for cooling systems with small size and low power consumption. Chiu et al [5] studied a bio-mimetic oscillating foil driven by a grooved cam for the cooling of heat sinks.…”

Section: Extended Abstractmentioning

confidence: 99%

The Heat Transfer Characteristics of Cooling Fan with Electromagnetic Driven Oscillating Foils

Chiu¹,

Hsieh²,

Chiu³

et al. 2016

Proceedings of the World Congress on Momentum, Heat and Mass Transfer

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Extended AbstractElectronic devices require effective and available cooling systems. Various designs of cooling systems have been proposed. For instance, high heat flux devices use phase change liquid cooling systems. However, most electronic devices use forced convection electric fan cooling because of cost issues. Recently, some researchers [1-4] have investigated piezoelectric fans for cooling systems with small size and low power consumption. Chiu et al.[5] studied a bio-mimetic oscillating foil driven by a grooved cam for the cooling of heat sinks. In this paper, a novel design of cooling fan with electromagnetic driven oscillating foil has been introduced and the characteristics of the cooling fan are under investigation.In this study, the heat transfer from a hot surface with forced convective heat transfer using cooling fan with electromagnetic driven oscillating foil is discussed. A solenoid was excited with alternating current to actuate the magnet mounting on the rectangular PET foil. The rotational axis of the foil was placed perpendicular to the hot surface of the heat source. Air flow was induced by the foil motion and resulted in forced convective heat transfer on the heated surface. The surface temperature on the center of the heated surface (junction temperature) was measured for various current frequencies and foil locations. The effective thermal resistance was estimated through the difference between the junction temperature and the ambient temperature divided by the heat flux input.In the experiment, the parameters include foil location, oscillating frequency, and foil length. The characteristics of the convective heat transfer depend on the oscillating frequency as well as the length of the foil. The frequencies for the study were set from 30Hz to 110Hz with increments of 20Hz. The applied current was set at 0.4A. The foil location, which was the distance between the foil tip and the center of the heated surface, ranged from 0 to 20mm. The results showed that the lowest thermal resistance was approximately 13.5°C/W at a frequency of 50Hz. The oscillating amplitude decreased with the increase in oscillating frequency. Also, the cooling performance depended on the frequency as well as the flapping amplitude. It also found that higher oscillating frequencies than 50Hz gave rise to higher thermal resistance. This was probably due to the smaller amplitude. In addition, the cooling performance at the resonant frequency was found to be significantly better than other frequencies. References[1] S. F. Liu, R. T. Huang, W. J. Sheu, and C. C. Wang, "Heat transfer by a piezoelectric fan on a flat surface subject to the influence of horizontal/vertical arrangement," Int. J. Heat Mass Trans., vol. 52, pp. 2565-2570, 2009 H. K. Ma, H. C. Su, C. L. Liu, and W. H. Ho, "Investigation of a piezoelectric fan embedded in a heat sink," Int. Comm. Heat Mass Trans., vol. 39, pp. 603-609, 2012. [3] H. K. Ma, L. K. Tan, Y. T. Li, and C. L. Liu, "Optimum thermal resistance of the multiple piezoelectric-magnetic fa...

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Section: Extended Abstractmentioning

confidence: 99%

The Heat Transfer Characteristics of Cooling Fan with Electromagnetic Driven Oscillating Foils

Chiu¹,

Hsieh²,

Chiu³

et al. 2016

Proceedings of the World Congress on Momentum, Heat and Mass Transfer

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“…2(c). Differing from the previous design of the single piezoelectric fan [16], the single piezoelectric fan can vibrate at the top side and the bottom side, and can provide two-directional air flows because the end clamp is fixed at the middle of the piezoelectric actuator. Moreover, the only difference between the single piezoelectric fan cases and the D-MFPA cases is that no other magnetic fans and magnets are used in the single piezoelectric fan cooling system; the resonance frequency of the single piezoelectric fan is 62.5 Hz, and the resonance frequency of a D-MFPA is at the lower frequency of 35 Hz because of the addition of a magnet at the tip of the piezoelectric fan.…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

Thermal performance of a dual-sided multiple fans system with a piezoelectric actuator on LEDs

2015

International Communications in Heat and Mass Transfer

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“…However, based on the specifications and position of the piezoelectric fan used in [10], when the mainstream Reynolds number exceeded 2200, the quasi-jet flow generated by piezoelectric fan reduced the overall heat transfer of cylinder on the contrary. Ma et al [11] indicated that the length of cantilever, oscillating frequency and amplitude influenced the forced air flow generated by piezoelectric fan strongly. They proposed a new type of cooling system combined with plate fin heat sink and piezoelectric fan.…”

Section: Introductionmentioning

confidence: 99%

Moving-orientation and position effects of the piezoelectric fan on thermal characteristics of the heat sink partially filled in a channel with axial flow

Jeng

Liu

2015

International Journal of Heat and Mass Transfer

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Investigation of a piezoelectric fan embedded in a heat sink

Cited by 52 publications

References 17 publications

The Heat Transfer Characteristics of Cooling Fan with Electromagnetic Driven Oscillating Foils

The Heat Transfer Characteristics of Cooling Fan with Electromagnetic Driven Oscillating Foils

Thermal performance of a dual-sided multiple fans system with a piezoelectric actuator on LEDs

Moving-orientation and position effects of the piezoelectric fan on thermal characteristics of the heat sink partially filled in a channel with axial flow

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