Piezoelectric Actuators as Synthetic Jets: Cavity Dimension Effects

Mane, Poorna; Mossi, Karla; Rostami, Ali; Bryant, Robert G.; Castro, Nicolas

doi:10.1177/1045389x06075658

Cited by 41 publications

(26 citation statements)

References 40 publications

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“…Comparison of radial velocity profile obtained from present numerical study ahead the existing experimental data of Mane et al[14] at a distance of 2 mm from the exit orifice…”

mentioning

confidence: 60%

Numerical Investigation of Dimensionless Numbers on Macro-scale Synthetic Jet Actuator in Quiescent Flow

Ahmad¹,

Qayoum²

2019

TI-IJES

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Synthetic jet is presently a novel technique for active flow control used for lift enhancement, improve boundary layer separation, and drag reduction, convective heat transfer enhancement and mixing enhancements. In this paper numerical simulation of macro-scale synthetic jet is carried out to investigate the effects of dimensionless numbers such as Stroke length (L), Stokes number (S) and Reynolds numbers (ReL) at constant orifice diameter of 5 mm. The computation is carried out by using commercial COMSOL Multiphysics 5.3a software for resolving the basic three dimensional incompressible unsteady Reynolds-averaged Navier-Stokes equations using k-turbulence model coupled with Moving Mesh ALE module to address the oscillating diaphragm movement. The oscillating diaphragm attached to the bottom of cavity is modelled as movable wall boundary in a sinusoidal manner with a peak-to peak displacement is equal to 0.247 mm at constant resonant frequency of 10 Hz. While the dimensionless Stroke length (L) ranges from 2 to 6, Stokes number S=7.2 to 22.9 and the Reynolds number establish on Stroke length ReL=11 to 1080 at distinct orifice diameters. Grid independence study has been invoked to confirm the authentication of extracted computational results. The radial velocity profiles at the orifice exit obtained in CFD simulations are compared with existing experimental data. A reasonable agreement between the modelling and experiment has been observed in specific domains of the flow field. The result obtained in the present study provides the basic design code for synthetic jet flow parameters for optimum output.

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“…Comparison of radial velocity profile obtained from present numerical study ahead the existing experimental data of Mane et al[14] at a distance of 2 mm from the exit orifice…”

mentioning

confidence: 60%

Numerical Investigation of Dimensionless Numbers on Macro-scale Synthetic Jet Actuator in Quiescent Flow

Ahmad¹,

Qayoum²

2019

TI-IJES

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“…At an applied voltage of 500 V the maximum amount of substrate strain is about 1 × 10 −3 m m −1 at the center where the water droplet is placed . While the amount of surface strain is relatively small, the composite piezoelectric unimorph substrates used in this work undergo a significant macroscopic change in overall shape and these materials have been used to produce synthetic air jets and in flow control applications . The amount of substrate deformation due to the applied electric field is on the order of millimeters and can be seen with the unaided eye.…”

Section: Resultsmentioning

confidence: 90%

“…A unimorph is a composite structure (e.g., a cantilever) with one active piezoelectric component and one inactive component. Unlike pure piezoelectric materials, unimorph composites can deform significantly in response to an electric field and have been used to construct actuators for applications such as flow control and acoustics . This article describes our preliminary work to develop compliant hydrophobic and superhydrophobic electrospun polymer coatings on piezoelectric unimorph composite substrates that can exhibit a field‐induced change in geometry and a corresponding change in wettability.…”

Section: Introductionmentioning

confidence: 99%

Electrospun polystyrene coatings with tunable wettability

Ghochaghi

Taiwo

Winkel

et al. 2014

J of Applied Polymer Sci

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Hydrophobic materials with tunable wettability were developed by electrospinning aligned polystyrene (PS) fibers onto the surface of a unimorph composite piezoelectric substrate. An electric field was used to modify the curvature of the substrate resulting in a corresponding change in the morphology of the electrospun coating. Contact angle measurements were performed on droplets deposited onto the surface before and after application of the electric field. The water droplet contact angle was observed to change in response to the applied voltage. Contact angle measurements were performed as a function of surface fiber density and suggest that the change in contact angle is caused by a transition from Wenzel to Cassie-Baxter wetting.

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“…Mane et al [18] studied the influence of the cavity dimension of a piezo-electric actuator. Good agreement between experimental and computational results was found, and disparities were attributed to the pre-stressed shape of the actuator and the pressure developed inside the cavity that loads the device, changing its outline with respect to the analytic profile used for the numerical simulation.…”

Section: Introductionmentioning

confidence: 99%