Centerline heat transfer coefficient distributions of synthetic jets impingement cooling

Gil, Paweł; Wilk, Joanna; Smusz, Robert; Gałek, Rafał

doi:10.1016/j.ijheatmasstransfer.2020.120147

Cited by 26 publications

(20 citation statements)

References 27 publications

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“…A maximum heat transfer enhancement was observed to be achieved at dimensionless stroke length = 4 and was caused by the increase in the strength of the vortex. In another experimental work, Gil et al [112] investigated the effect of synthetic jet impingement for a constant Reynolds number and varying stoke number on heat transfer performance. The study was performed for a Reynolds number range from 5440 to 11,475, a stroke length range from 7.49 to 38.5, and a jet-target surface spacing from 0 to 20.…”

Section: Excited Jetsmentioning

confidence: 99%

Heat Transfer Augmentation through Different Jet Impingement Techniques: A State-of-the-Art Review

et al. 2021

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Jet impingement is considered to be an effective technique to enhance the heat transfer rate, and it finds many applications in the scientific and industrial horizons. The objective of this paper is to summarize heat transfer enhancement through different jet impingement methods and provide a platform for identifying the scope for future work. This study reviews various experimental and numerical studies of jet impingement methods for thermal-hydraulic improvement of heat transfer surfaces. The jet impingement methods considered in the present work include shapes of the target surface, the jet/nozzle–target surface distance, extended jet holes, nanofluids, and the use of phase change materials (PCMs). The present work also includes both single-jet and multiple-jet impingement studies for different industrial applications.

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Section: Excited Jetsmentioning

confidence: 99%

Heat Transfer Augmentation through Different Jet Impingement Techniques: A State-of-the-Art Review

et al. 2021

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“…Where ̅ is the normal Reynolds-averaged (time) density. In the Reynolds averaging method, the density is constant, and according to the equation (2)(3)(4)(5)(6), the term of density is not considered (it is used for incompressible flow). For Favre averaging, it is common to write the instantaneous velocity by two parts of mass averaged, ̃, and the oscillating, ′′ :…”

Section: Favre Averagingmentioning

confidence: 99%

“…The most common application of synthetic jets is in controlling flow, propulsion, fluid composition, and thermal management of electronic equipment. Synthetic jets have attracted the attention of researchers from different fields during the past decades [2].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Effect of Different Variables on the Cooling of a Flat Plate Using a Synthetic Jet

Nabavi

Jafari

2021

MJMIE

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A synthetic jet is caused by the periodic motion of a diaphragm within a cavity. There is one or more orifices or outlets in this cavity. The main advantage of this type of jet compared to a continuous jet is that the synthetic jet is composed of transverse flow, and therefore, it does not need a continuous source of fluid, unlike the continuous jet. In recent years, synthetic jets have received a great deal of attention so that they have been used in a wide range of applications such as controlling separation and turbulence, besides, the cooling of electronic equipment and propulsion. In the present study, the jet is placed perpendicular to the flat plane with constant heat flux, thereafter, the effect of some geometric parameters were evaluated numerically such as the ratio of the distance between the jet and the impinging plate to the nozzle width, the ratio of the impinging plate length to the jet nozzle width, the ratio of cavity width of the synthetic jet to the nozzle width, the ratio of the cavity height to the nozzle width, the angle of the impinging plate, besides, the diaphragm specifications including amplitude and frequency of the jet diaphragm in heat transfer using OpenFOAM open-source software. The results show that the frequency and the length of the impinging plate are the most effective parameters, respectively, in terms of the diaphragm and geometry.

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“…Burak et al (2020) calculated the two-phase heat transfer coefficient of the boiling fluid in the micro channel, and put forward the empirical equation of the heat transfer coefficient under the influence of parameters such as aspect ratio. Gil et al (2020) introduced the test methods and results of the heat transfer coefficient, velocity and pressure of the synthetic jet under the constant Reynolds number and the varying Stokes number. Zuev et al (2020) derived the local heat transfer coefficient of laminar rotating flow considering laminar temperature and dynamic boundary layer.…”

Section: Introductionmentioning

confidence: 99%

CFD-based calculation method of convective heat transfer coefficient of spiral bevel gear in intermediate gearbox under splash lubrication

Wang

Liu³

et al. 2021

ILT

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Purpose This paper aims to propose a numerical method to calculate the convective heat transfer coefficient of spiral bevel gears under the condition of splash lubrication and to reveal the lubrication and temperature characteristics between the gears and the oil-air two-phase flow. Design/methodology/approach Based on computational fluid dynamics, the multiple reference frames (MRF) method was used to simulate the rotational characteristics of gears and the motions of their surrounding fluid. The lubrication and temperature characteristics of gears were studied by combining the MRF method with the volume of the fluid multiphase flow model. Findings The convective heat transfer coefficient can be improved by increasing the rotational speed and the oil immersion depth. Moreover, the temperature of the tooth surface having a large convective heat transfer coefficient is also found to be low. A large convection heat transfer coefficient could lead to a good cooling effect. Originality/value This method can be used to obtain the convective heat transfer coefficient values at different meshing positions, different radii and different tooth surface positions. It also can provide research methods for improving the cooling effect of gears under the condition of splash lubrication. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2020-0233/

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Centerline heat transfer coefficient distributions of synthetic jets impingement cooling

Cited by 26 publications

References 27 publications

Heat Transfer Augmentation through Different Jet Impingement Techniques: A State-of-the-Art Review

Heat Transfer Augmentation through Different Jet Impingement Techniques: A State-of-the-Art Review

Numerical Study of the Effect of Different Variables on the Cooling of a Flat Plate Using a Synthetic Jet

CFD-based calculation method of convective heat transfer coefficient of spiral bevel gear in intermediate gearbox under splash lubrication

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