Influence of the Excitation Frequency and Orifice Geometry on the Fluid Flow and Heat Transfer Characteristics of Synthetic Jet Actuators

Qayoum, Adnan; Malik, Abhishek

doi:10.1134/s0015462819040086

Cited by 8 publications

(17 citation statements)

References 20 publications

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“…The parametric investigation shows that while H/d determines the transient heat transfer performance, Re mostly influences the improvements of the time-area-averaged Nu and the overall pressure drop. Qayoum et al, [38] has carried out comprehensive computational research on the effect of orifice on the optimum excitation frequency of a single cavity with different orifices. A piezoelectric actuator's SJ velocity is greatest when it is operating at its resonance frequency.…”

Section: Working Principlesmentioning

confidence: 99%

“…One can infer that low frequency is good at removing heat from a system at low Re, whereas high frequency is more efficient at high Re. Qayoum et al, [38] has found that a piezoelectric actuator's SJ velocity is greatest when it is operating at its resonance frequency. The multi-orifice SJ's optimum frequency is lower than the single-orifice SJ's.…”

Section: Frequency Analysismentioning

confidence: 99%

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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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Section: Working Principlesmentioning

confidence: 99%

Section: Frequency Analysismentioning

confidence: 99%

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

Radhiah

Firdaus

Yusof

2023

CFDL

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“…However, these shapes of the orifice did not give better results than the rectangular and square orifices. The other authors investigated not only the impact of shape on SJ parameters but also the number of orifices [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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

2021

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In this paper, synthetic jet actuators (SJAs) with three different orifice shapes (circular, square, and slot) with the same cross-section area were investigated. The SJA efficiency and the synthetic jet (SJ) Reynolds number were calculated based on the time-mean reaction force measurement. The momentum velocity was measured with hot-wire anemometry and additionally, the sound pressure level (SPL) was measured. The efficiency was equal maximally to 5.3% for each orifice shape, but the square orifice characterized the higher Reynolds number. The compared centerline (axial) velocities and the radial velocity profile at a distance of 112 mm were similar for each orifice type. The SPL measurement results were surprisingly constant in relation to each other. The square orifice generates the lowest SPL, approximately 2.8dB lower than the circular orifice, and approximately 4.2dB lower than the slot orifice, at each investigated real power. Finally, the differences to other papers and limitations of the approach to comparing orifices presented in the present paper were indicated.

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“…The environmental fluid fills the SJA cavity during the ingestion phase. Thanks to formation of the edge vortices, the SJs are used in many fields of technology including: aviation [1,2], transport [3,4], heat transport [5][6][7], active flow control [7][8][9] and so on. Due to many applications, SJs are produced with the use of many types of different actuators (in terms of construction and type) so as to increase the SJ efficiency or velocity.…”

Section: Introductionmentioning

confidence: 99%

“…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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Influence of the Excitation Frequency and Orifice Geometry on the Fluid Flow and Heat Transfer Characteristics of Synthetic Jet Actuators

Cited by 8 publications

References 20 publications

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

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

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

Synthetic jet actuator with two opposite diaphragms

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