Heat transfer by a piezoelectric fan on a flat surface subject to the influence of horizontal/vertical arrangement

Liu, Sheng Fu; Huang, Ren Tsung; Sheu, Wen-Jenn; Wang, Chi-Chuan

doi:10.1016/j.ijheatmasstransfer.2009.01.013

Cited by 76 publications

(37 citation statements)

References 13 publications

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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%

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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%

“…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.…”

mentioning

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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“…Acikailn et al [5] observed the flow field around fan tip and investigated the heat transfer coefficient on heat source. Liu et al [6] tested the thermal performance of fans with various fan geometries and horizontal/vertical arrangements. Kimber and Garimella [7] measured various piezoelectric fans mounted perpendicular to a constant heat flux surface and studied the thermal performance across specific range of fan dimensions, vibration frequency, and amplitude.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on the Flow Field Produced by Oscillating Foils

et al. 2017

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Abstract. In present manuscript, the flow field produced by oscillating foils in a duct were under investigation numerically. The flow field was considered as an incompressible laminar transient flow. In this paper, the oscillating frequencies were 2, 4 and 6 Hz; the span angles of the foil were 30˚, 60˚, 90˚, 120˚, and 150˚, respectively. The flow field produced by a particular oscillating pattern (fast forward slow backward, FFSB) has been made in comparison with that by the sinusoidal oscillating pattern. The flow field produced by dual oscillating foils was also analysed. Two foils oscillated in the same direction (in-phase) and in the opposite direction (counter-phase) were studied as well. Commercial software ANSYS-FLUENT was employed for the 2D numerical simulation. A moving grid technique was utilized in the analysis. Results present the flow average velocity increases as the oscillating frequency increases. It is also shown that the flow average velocity with span angle of 120˚ is the largest among these cases. In addition, the flow average velocity with dual foils is better than that with a single foil.

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“…Since then, many studies experimentally examined the performance of heat transfer enhancement under the actuation of a piezofan [3][4][5][6][7]. Some numerical studies were performed to investigate the flow fields and heat transfer performance of piezofans [8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

A Study of an Effective Heat-Dissipating Piezoelectric Fan for High Heat Density Devices

Lin

Jang

Leu³

2016

Energies

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Abstract:Heat dissipation per unit volume has grown rapidly, as the size of modern electronic devices has continued to decrease. The air flow induced by an oscillating cantilever blade enhances the heat transfer performance of high heat density devices. The heat transfer improvement mainly depends on the velocity magnitude and distribution of air streams induced by the vibrating blade. Accordingly, this study numerically and experimentally examines the time-varying flow characteristics of a vibrating cantilever for five blade types. The blades are rectangular or trapezoidal with various widths and actuated at various frequencies. The fluid domain is numerically discretized using a dynamic meshing scheme to model the three-dimensional time-varying vibrating blade. The experiment utilizes nine hot-wire velocity meters to measure the average velocities. The flow structure with streamlines and velocity contours of the induced air flow are determined at various section planes. The results show that a major maximum-velocity region appears around the blade tip and that four minor local-maximum-velocity regions appear at the four corners. In addition, the width and width ratio of the blade significantly affects the velocity distribution of the flow induced by the vibrating cantilever blade.

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Heat transfer by a piezoelectric fan on a flat surface subject to the influence of horizontal/vertical arrangement

Cited by 76 publications

References 13 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

Numerical Investigation on the Flow Field Produced by Oscillating Foils

A Study of an Effective Heat-Dissipating Piezoelectric Fan for High Heat Density Devices

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