Thermal management of a laptop computer with synthetic air microjets

Campbell, S.J.; Black, W. Z.; Glezer, Ari; Hartley, J. G.

doi:10.1109/itherm.1998.689518

Cited by 49 publications

(24 citation statements)

References 3 publications

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“…For example, in a study investigating the application of synthetic jets for heat transfer to cool a laptop computer, 7 it was reported that a typical frequency of oscillation was 100 Hz and a typical orifice diameter was 1.6 mm. The Stokes number of this flow is approximately 10.…”

Section: Discussionmentioning

confidence: 99%

Formation Criterion for Synthetic Jets

et al. 2005

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A formation criterion for synthetic jets is proposed and validated. A synthetic jet actuator is a zero-net mass-flux device that imparts momentum to its surroundings. Jet formation is defined as the appearance of a time-averaged outward velocity along the jet axis and corresponds to the generation and subsequent convection or escape of a vortex ring. It is shown that over a wide range of operating conditions synthetic jet formation is governed by the jet Strouhal number Sr (or Reynolds number Re and Stokes number S). Both numerical simulations and experiments are performed to supplement available two-dimensional and axisymmetric synthetic jet formation data in the literature. The data support the jet formation criterion 1/Sr = Re/S 2 > K, where the constant K is approximately 1 and 0.16 for two-dimensional and axisymmetric synthetic jets, respectively. In addition, the dependence of the constant K on the normalized radius of curvature of a rounded orifice or slot is addressed. The criterion is expected to serve as a useful design guide for synthetic jet formation in flow control, heat transfer, and acoustic liner applications, in which a stronger jet is synonymous with increased momentum transfer, vorticity generation, and acoustic nonlinearities.

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Section: Discussionmentioning

confidence: 99%

Formation Criterion for Synthetic Jets

et al. 2005

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“…Campbell et al [18] conducted a review of heat transfer to an impinging synthetic jet for a wider range of parameters that included varying the number of jets in a jet array, various levels of confinement and the addition of cross flow.…”

Section: Impinging Synthetic Jets For Heat Transfer Applicationsmentioning

confidence: 99%

Flow regime characterisation of an impinging axisymmetric synthetic jet

McGuinn

Farrelly

Persoons

et al. 2013

Experimental Thermal and Fluid Science

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-Impinging synthetic jets have excellent potential for energy-efficient local cooling in confined geometries. For a given geometry, synthetic jet flows are mainly characterised by the Reynolds number and the ratio of stroke length to a geometric length scale. The flow field of an impinging synthetic jet and the corresponding surface heat transfer distribution are strongly dependent on the dimensionless stroke length, yet few studies have investigated the flow field dependence for a wide range of stroke lengths. Therefore, the aim of this paper is to identify the various flow regimes as a function of stroke length. The experimental approach combines high speed particle image velocimetry and single point hot wire anemometry, and investigates an 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

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“…Comprehensive reviews of heat transfer to impinging synthetic air jets have been conducted by Gillespie et al [4], Wang et al [5] and Pavlova and Amitay [6] amongst others. Campbell et al [7] conducted a review of heat transfer to an impinging synthetic jet for a wider range of parameters that included varying the number of jets in a jet array, various levels of confinement and the addition of cross flow. Gallas et al [8] presented an extensive review of numerical investigations that have been conducted in the area of lumped element modelling of piezoelectric-driven synthetic jet actuators.…”

Section: Turbulence Heat and Mass Transfermentioning

confidence: 99%

“…Gallas et al [8] presented an extensive review of numerical investigations that have been conducted in the area of lumped element modelling of piezoelectric-driven synthetic jet actuators. Campbell et al [9] also conducted experiments to determine the effectiveness of synthetic air microjets in cooling packaged thermal test chips and a laptop computer processor. Kercher et al [1] investigated the applicability of miniaturized synthetic jet technology to the area of thermal management of microelectronic devices and directly compared the cooling performance of these microjets with standard cooling fans.…”

Section: Turbulence Heat and Mass Transfermentioning

confidence: 99%

Heat transfer and air temperature measurements of an impinging synthetic air jet

McGuinn

Persoons

O’Donovan³

et al. 2009

Proceedings of the Sixth International Symposium on Turbulence, Heat and Mass Transfer

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Synthetic jets are a relatively new technology that can achieve high rates of heat transfer. They have been shown to out-perform comparable steady impinging jets without the need for an external air supply system. The current experimental research is concerned with the mean and fluctuating heat transfer and local air temperature distribution of an impinging synthetic jet. Tests were conducted for Reynolds numbers from 1000 to 3000, and nozzle to impingement surface spacings of 2 and 6 diameters. The stroke length was maintained constant and equal to 8 diameters in all the reported data. The results obtained show a strong correspondence between the local heat transfer and air temperatures. The periodicity of the synthetic air jet flow characterise the surface heat flux and local fluid temperature behaviour in the stagnation region. At larger radial distances and Reynolds numbers the influence is less significant however.

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Thermal management of a laptop computer with synthetic air microjets

Cited by 49 publications

References 3 publications

Formation Criterion for Synthetic Jets

Formation Criterion for Synthetic Jets

Flow regime characterisation of an impinging axisymmetric synthetic jet

Heat transfer and air temperature measurements of an impinging synthetic air jet

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