Study of an LED device with vibrating piezoelectric fins

Ma, Hwong‐Wen; Chen, B. R.; Lan, Hao-Yu; Lin, K. Y.; Chao, Ching‐Kong

doi:10.1109/stherm.2009.4810774

Cited by 11 publications

(3 citation statements)

References 12 publications

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“…The study revealed that vibration enhances heat transfer and achieves a maximum temperature reduction of 35% at the fin tip. In their numerical investigation, Ma et al [43] examined the thermal performance of six piezo-actuated fins and observed an 11.6% enhancement in thermal effectiveness. Another numerical study by Dey and Chakraborty [44] focused on the impact of piezoactuated fin motion with a static substrate on heat-transfer enhancement.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Forced Convective Heat-Transfer Enhancement of Conventional and Thin Plate-Fin Heat Sinks under Sinusoidal Vibration

Rasangika,

Nasif,

Al-Waked

2023

Applied Sciences

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Applying sinusoidal vibration to heat sinks has proven to be a promising technique for improving heat transfer by disrupting the thermal boundary layer. However, applying sinusoidal vibration to the base of thin plate-fin heat sinks can cause a flapping motion within the fins, further enhancing heat transfer. Therefore, the current study numerically investigates and compares the effects of sinusoidal vibrations on the thermal performance of conventional and thin plate-fin heat sinks. The study concludes that increased vibrational amplitude and frequency (f ˃ 30 Hz) increases the vibration-assisted thermal performance. It was found that the thin plate-fin heat sink provides higher thermal performance compared to the conventional heat sink at every level of vibrational characteristics. The study found that the application of vibration enhances the Nusselt number up to a maximum of 20% and 15% in thin plate-fin and conventional heat sinks, respectively. Furthermore, the Reynolds number is reduced by 33.3% and 28% with thin plate-fin and conventional heat sinks compared with non-vibrating heat sinks, indicating a potential reduction of the size of the cooling system or fin size.

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Section: Introductionmentioning

confidence: 99%

Comparison of Forced Convective Heat-Transfer Enhancement of Conventional and Thin Plate-Fin Heat Sinks under Sinusoidal Vibration

Rasangika,

Nasif,

Al-Waked

2023

Applied Sciences

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“…The application of multiple magnetic-piezoelectric fans on LEDs lighting and electronics was also investigated to assess its thermal performance. Theoretical and simulation models were developed in previous studies [6,7].…”

Section: Introductionmentioning

confidence: 99%

The application of micro multiple piezoelectric-magnetic fans (m-MPMF) on LEDs thermal management

Liao

et al. 2014

2014 Semiconductor Thermal Measurement and Management Symposium (SEMI-THERM)

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Conventionally, thermal management of LEDs lighting is achieved by natural convection with different types of heat sink. However, as high-power LEDs lighting developing, passive cooling system can't afford sufficient cooling ability for LEDs lighting. Previous study developed a novel piezoelectric (PZT) fan with multiple magnetic fans cooling system which only used one piezoelectric actuator to provide more air flow. In this study, micro multiple piezoelectricmagnetic fans (called "m-MPMF") is developed to provide an innovative cooling solution on thermal management of LEDs lighting. Moreover, efficiency of MPMF system in this study is defined as the improvement of thermal resistance compared with natural convection. The results show the carbon fiber sheet of magnetic fan can perform better cooling ability than PVC fan because of higher Young's modulus. Efficiency of MPMF system showed 74% improvement by using carbon fiber sheet, in contrary, only 64% improvement of PVC fan. The m-MPMF system is also developed for small scale LEDs lighting cooling. The result showed m-MPMF system can keep temperature of 9W LEDs lighting substrate below 55℃ and T-shape design of m-MPMF can further reduce temperature to 45.2℃ with only 0.13W power consumption.

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“…Ma et al [15] examined an innovative design of a vibrating fins cooling system. A three-dimensional simulated model for the cooling system was built to investigate its performance.…”

Section: Introductionmentioning

confidence: 99%