Synthetic Jet Actuators with the Same Cross-Sectional Area Orifices-Flow and Acoustic Aspects

Smyk, Emil; Wilk, Joanna; Markowicz, Marek

doi:10.3390/app11104600

Cited by 8 publications

(5 citation statements)

References 52 publications

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“…The presented noise reduction is smaller than the reduction obtained by the use of the other shape of the orifice. Mangate and Chaudhari [30] obtained the maximal SPL reduction about of 13 dB for the oval orifice, and Smyk et al [31] about of 5.7 dB for the square office.…”

Section: Noise Levelmentioning

confidence: 90%

“…The SPL was measured according to ISO 3746:2010 [35]. The same measurements method was used in [31,36,37].…”

Section: Methodsmentioning

confidence: 99%

“…The oval office was even about 13 dB quieter than the circular orifice at Reynolds number Re = 10, 000. The impact of the orifice shape on the generated noise was also investigated by Bhapkar et al [18], Kanase et al [19], and Smyk et al [31]. Based on these papers, it can be observed that the circular orifice shape is one of the least favorable in terms of the noise generated by SJA.…”

Section: Introductionmentioning

confidence: 93%

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Sharp and Rounded Cutouts in a Chevron Orifice and Them Impact on the Acoustic and Flow Parameters of Synthetic Jet

Smyk

2021

Applied Sciences

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The application of a synthetic jet actuator in workplaces entails the necessity of noise reduction, which they generate. One of the methods to achieve this is the use of the chevron orifice or nozzle. Therefore, the impact of different numbers of chevrons and rounding of cutouts in the orifice on the actuator efficiency and the sound pressure level was tested. The chevron orifices were compared to the circular orifice. The time-mean reaction force method was used to measured efficiency and flow parameters, and the noise was measured according to the ISO 3746:2010. The rounded cutouts had an advantageous impact on the actuator efficiency at the power P >1 W, while the efficiency of the actuator with classic chevron orifice was smaller than with circular orifice. The noise generated by the actuator with the chevron orifice was smaller from 0.6 to 1.6 dB than by the actuator with the circular orifice, at the number of chevrons equal to 7 or more. The rounding of cutouts in the chevron orifice can advantageously impact the parameters of synthetic jet actuators.

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Section: Noise Levelmentioning

confidence: 90%

“…The SPL was measured according to ISO 3746:2010 [35]. The same measurements method was used in [31,36,37].…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

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Sharp and Rounded Cutouts in a Chevron Orifice and Them Impact on the Acoustic and Flow Parameters of Synthetic Jet

Smyk

2021

Applied Sciences

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“…The dimensions and form of the SJ's cavity have an impact on the velocity produced. As it affects the average velocity, a shallow cavity has a negative impact on SJ performance [6]. The orifice's dimensions have a significant impact on the SJ's performance.…”

Section: Introductionmentioning

confidence: 99%

Current Review on Numerical Simulation of Synthetic Jet (SJ) Cooling

Radhiah

Firdaus

Yusof

2023

CFDL

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This paper reviews the working principles and numerical approach for the synthetic jet cooling in the previous studies. It is essential to reviews relevant previous research within the study scope in order to further enhance the improvement of synthetic jet technology. Furthermore, numerical approach can cut the cost and save time compared to experimental works. Numerical simulation is crucial to expedite the synthetic jet product enhancement as it opens up big potential in electronic device application. Studies carried out by many scholars within the scope of this publication have demonstrated that resonance frequency enhances the performance of synthetic jet. Reynold numbers vary with frequency, and greater Reynold numbers produced higher heat transfer coefficients. The majority of researchers have also chosen the cylindrical cavity type because it offers superior velocity output, which improves cooling performance. According to previous studies, a smaller diameter leads to a higher velocity output and a higher Reynold number

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“…The latest references include, among others, the review articles [1,2], in which the authors present a detailed overview of SJ characteristics and parameters that can influence the enhancement of fluid flow and heat transfer. In addition, research on the acoustic and flow properties of an SJ actuator driven by a loudspeaker was recently conducted in [3,4].…”

Section: Introductionmentioning

confidence: 99%

Helmholtz Resonance Frequency of the Synthetic Jet Actuator

2021

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This paper presents the results of experimental investigations of 108 geometrical configurations of a loudspeaker-driven synthetic jet (SJ) actuator. The considered cases of the SJ actuator were characterized by a high coupling ratio. The experiment was performed to determine the impact of geometry on the Helmholtz resonance frequency. Geometrical parameters of the orifice diameter, orifice length, and cavity volume were changed within a wide range. The dependences of electrical and flow parameters that characterized the synthetic jet actuators as a function of the excitation frequency were also identified. The main goal of the research was to identify the optimal mathematical formula of the model to calculate the Helmholtz resonance frequency in the case of synthetic jet actuators. To determine the model that was characterized by the best fit of the experimental results, an additional geometrical dimensionless parameter, representing the ratio of the orifice cross-section area to the cross-section area of the cavity, was introduced. A significant impact of this parameter on the effective orifice length was noted. Based on the research findings, a model was obtained for which the results of the experiment were in the error range of ±6% for 95% of the measurement data. The obtained model is an improved version of the classical model used in the description of the resonance frequency in the case of a synthetic jet actuator. The model enables highly accurate determination of the Helmholtz resonance frequency at which the maximum synthetic jet actuator parameters occur.

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Synthetic Jet Actuators with the Same Cross-Sectional Area Orifices-Flow and Acoustic Aspects

Cited by 8 publications

References 52 publications

Sharp and Rounded Cutouts in a Chevron Orifice and Them Impact on the Acoustic and Flow Parameters of Synthetic Jet

Sharp and Rounded Cutouts in a Chevron Orifice and Them Impact on the Acoustic and Flow Parameters of Synthetic Jet

Current Review on Numerical Simulation of Synthetic Jet (SJ) Cooling

Helmholtz Resonance Frequency of the Synthetic Jet Actuator

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