Heat transfer and flow characteristics of a pair of adjacent impinging synthetic jets

Fanning, Eoin; Persoons, Tim; Murray, Darina B.

doi:10.1016/j.ijheatfluidflow.2015.05.005

Cited by 44 publications

(9 citation statements)

References 24 publications

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“…In both cases however, the orifice can be circular or rectangular in shape, and the jet can issue at an oblique angle. Moreover, the use of dual adjacent SJAs can be used to achieve flow vectoring, determined by the phase difference in the driving signals for adjacent actuators [8].…”

Section: Introductionmentioning

confidence: 99%

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Validating a Reduced-Order Model for Synthetic Jet Actuators Using CFD and Experimental Data

2018

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Synthetic jet actuators (SJA) are emerging in various engineering applications, from flow separation and noise control in aviation to thermal management of electronics. A SJA oscillates a flexible membrane inside a cavity connected to a nozzle producing vortices. A complex interaction between the cavity pressure field and the driving electronics can make it difficult to predict performance. A reduced-order model (ROM) has been developed to predict the performance of SJAs. This paper applies this model to a canonical configuration with applications in flow control and electronics cooling, consisting of a single SJA with a rectangular orifice, emanating perpendicular to the surface. The practical implementation of the ROM to estimate the relationship between cavity pressure and jet velocity, jet velocity and diaphragm deflection and applied driving voltage is explained in detail. Unsteady Reynolds-averaged Navier Stokes computational fluid dynamics (CFD) simulations are used to assess the reliability of the reduced-order model. The CFD model itself has been validated with experimental measurements. The effect of orifice aspect ratio on the ROM parameters has been discussed. Findings indicate that the ROM is capable of predicting the SJA performance for a wide range of operating conditions (in terms of frequency and amplitude).

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Section: Introductionmentioning

confidence: 99%

“…A calibration of cavity acoustic pressure p c with orifice velocity is, therefore, preferred [9][10][11]. For instance, when changing the phase difference between adjacent SJAs, only a pressure-velocity calibration approach can maintain a constant jet Reynolds number [8].…”

Section: Introductionmentioning

confidence: 99%

Validating a Reduced-Order Model for Synthetic Jet Actuators Using CFD and Experimental Data

2018

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“…A synthetic jet can be quieter than an axial fan for the same or better thermal performance [83]. Furthermore, a pair of phase-controlled adjacent jets can be used to control the angle of the jet flow [84], thus providing opportunities for active cooling control. Synthetic jets (and piezo fans) can be used in combination with low speed fans to decouple local heat transfer from thermal advection due to bulk air flow.…”

Section: B Convective Air Coolingmentioning

confidence: 99%

Electronics Thermal Management in Information and Communications Technologies: Challenges and Future Directions

Garimella

Persoons

Weibel

et al. 2017

IEEE Trans. Compon., Packag. Manufact. Technol.

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164

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“…Among others, the method for improving or changing the SJ parameters can be improved by modification of the actuator cavity shape [17], use of two or more actuators operating together with the nozzle, placed next to each other [18,19], the use of double orifice [6,20] or use of more than one diaphragm [21][22][23]. The benefits of using two diaphragms, instead of one, are described in [24,25].…”

Section: Introductionmentioning

confidence: 99%

Synthetic jet actuator with two opposite diaphragms

Smyk

Wawrzyniak

Peszyński

2020

Mechanics and Mechanical Engineering

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The synthetic jet actuators are one of the most investigated types of actuators used in heat transfer and active flow control. The energetic efficiency of actuators is a key parameter determining the possibility of device use. The actuators with two or more diaphragms have higher efficiency than the actuators with only one. The paper presents the investigations of the acoustic synthetic jet actuator with two opposite diaphragms. In the paper, synthetic jet velocity, Reynolds number and the energetic efficiency as a function of oscillating actuator frequency, for a different cavity, orifice configuration and one real input power P0 = 2 W were studied. The possibility of theoretical calculation of first and second resonance frequency were checked. The coupling ratio for actuators was calculated. The maximum energetic efficiency was η = 8.67% and Reynolds number Re = 8503. The possibility of using the same dependencies and rules during the design of actuators with two opposite diaphragms as in the case of actuators with one diaphragm was demonstrated. The results may be useful in the design of the actuators of the two membranes.

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Heat transfer and flow characteristics of a pair of adjacent impinging synthetic jets

Cited by 44 publications

References 24 publications

Validating a Reduced-Order Model for Synthetic Jet Actuators Using CFD and Experimental Data

Validating a Reduced-Order Model for Synthetic Jet Actuators Using CFD and Experimental Data

Electronics Thermal Management in Information and Communications Technologies: Challenges and Future Directions

Synthetic jet actuator with two opposite diaphragms

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