Volume 10: Heat and Mass Transport Processes, Parts a and B 2011
DOI: 10.1115/imece2011-64544
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Enhancing Heat Transfer of Air-Cooled Heat Sinks Using Piezoelectrically-Driven Agitators and Synthetic Jets

Abstract: Air-cooled heat sinks prevail in microelectronics cooling due to their high reliability, low cost, and simplicity. But, their heat transfer performance must be enhanced if they are to compete for high-flux applications with liquid or phase-change cooling. Piezoelectrically-driven agitators and synthetic jets have been reported as good options in enhancing heat transfer of surfaces close to them. This study proposes that agitators and synthetic jets be integrated within air-cooled heat sinks to significantly ra… Show more

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Cited by 10 publications
(10 citation statements)
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“…Significant heat transfer improvements by a synthetic jet from a single orifice was also found for a micro-channel [11] and a flat surface [12,13]. By way of integrating piezoelectrically-driven agitators and synthetic jets operating at their respective resonant frequencies for an air-cooled plate-fin heat sink, the flow agitations and synthetic jets actively deflect the bulk airflow [14]. While the turbulence introduced in the channel flow near the fin tips by the pulsating airflows from the synthetic jets promotes regional heat transfer, the agitator elevates heat transfer rates in the channel wall and base regions.…”
Section: Introductionmentioning
confidence: 90%
See 1 more Smart Citation
“…Significant heat transfer improvements by a synthetic jet from a single orifice was also found for a micro-channel [11] and a flat surface [12,13]. By way of integrating piezoelectrically-driven agitators and synthetic jets operating at their respective resonant frequencies for an air-cooled plate-fin heat sink, the flow agitations and synthetic jets actively deflect the bulk airflow [14]. While the turbulence introduced in the channel flow near the fin tips by the pulsating airflows from the synthetic jets promotes regional heat transfer, the agitator elevates heat transfer rates in the channel wall and base regions.…”
Section: Introductionmentioning
confidence: 90%
“…Due to the synthetic jets and the periodic traverse motion of the agitator fin, the flow accelerates and decelerates alongside the inner part of the agitator fin respectively. At the combined active mode, heat transfer performance is raised by up to 82.4% [14].…”
Section: Introductionmentioning
confidence: 98%
“…This turbulence was found to play a key role in flow mixing and increasing heat transfer. Yu et al [14] numerically studied heat transfer enhancement obtained when fan-cooled heat sinks were assisted by active devices like agitators and synthetic jets. This study was done for a single channel of the heat sink.…”
Section: Introductionmentioning
confidence: 99%
“…The overall heat transfer rate of the synthetic jet module was about 30% better than an equivalent continuous jet. Recently, Yu et al [10] proposed an integrated air-cooled heat sink by using piezoelectric-driven agitators and synthetic jets. The proposed integration was investigated experimentally and computationally in a single-channel heat sink with one agitator and two synthetic jet arrays.…”
Section: Introductionmentioning
confidence: 99%
“…An 8 mm  1 mm synthetic jet was studied by varying the applied voltage (20-100 V) and frequency (200-600 Hz). Both jets impingement were conducted at several dimensionless jet-to-surface spacings (s/d e = 5, 10,15,20). For the synthetic jet, the best heat transfer was observed at s/d e = 10.…”
Section: Introductionmentioning
confidence: 99%