Synthetic jet actuator with two opposite diaphragms

Smyk, Emil; Wawrzyniak, S.; Peszyński, K.

doi:10.2478/mme-2020-0004

Cited by 11 publications

(5 citation statements)

References 31 publications

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“…For this reason, the designated frequency has been identified as a natural frequency. The theme of the characteristic frequency of the actuator is widely described in [31]. The averaged and maximum velocity of SJs in the centerline at the distance of x/d = 0 is shown in Figure 4.…”

Section: A Search Of Characteristic Frequencymentioning

confidence: 99%

Acoustic and Flow Aspects of Synthetic Jet Actuators with Chevron Orifices

Smyk

Markowicz

2021

Applied Sciences

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The use of a chevron nozzle/orifice is one of the methods of heat transfer enhancement and noise reduction. In the case of synthetic jets, the number of papers on this topic is small. Therefore, a synthetic jet actuator with three different chevron orifices and one circular orifice is investigated. The aim of this study is to find the impact of orifice shape on centerline velocity (measured with a hot-wire anemometer) and determine if the chevron orifice reduces the generated noise. The sound pressure level was strongly dependent on the input actuator’s power, and only one chevron orifice ensured noise reduction for low power (p = 6; 8 W). At real power p = 12 W, the sound pressure level was lower for each chevron orifice actuator than in the case of the circular orifice actuator. It is shown that the application of a chevron nozzle does not have to provide noise reduction. It is important in the case of the design of new actuators that are to operate in places where noise levels should be limited (e.g., offices).

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Section: A Search Of Characteristic Frequencymentioning

confidence: 99%

Acoustic and Flow Aspects of Synthetic Jet Actuators with Chevron Orifices

Smyk

Markowicz

2021

Applied Sciences

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“…Normally the orifice height is the same for each actuator. It is also a characteristic parameter and affects the parameters of the generated SJ, as for example the Reynolds number, the SJ velocity and the SJA efficiency [47,52], or the SPL [51]. However, these dependencies were not found during this research.…”

Section: Differences From Other Studiesmentioning

confidence: 70%

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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“…When it comes to Helmholtz efficiency, these dependences are the exact reverse of one another. A synthetic jet actuator that only has one diaphragm exhibits a connection that is analogous to this one [41][42][43][44][45].…”

Section: Nozzle Shape and Sizementioning

confidence: 99%

A Review of Experimentation of Synthetic Jet Cooling

Ahmad Faiz Ahmad Kamil,

Sh Mohd Firdaus Sh Abdul Nasir,

Hamid Yusoff

et al. 2023

ARFMTS

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As the electronic device is becoming more advance, the traditional cooling fan in becoming more constrained to its limited dimensions or space. The compact electronic devices with substantial power requirements and tiny electronic components are prone to overheating. This is because these devices dimensions make heat transmission less efficient, making the overheating more likely. Because of the increasing need for smaller devices, makers of electronic components are being compelled to pack transistors into ever-smaller places. This has led to an increase in the amount of overheating that occurs because thermal flow is being constrained. The current period, with its thin and compact electronics, calls for an improved method of cooling, and the synthetic jet-cooling technique will be the subject of the attention of this particular piece of research. The purpose of this study is to discuss the working principles and numerical technique for the synthetic jet cooling that was used in the earlier investigations which investigate the frequency, the distance between synthetic jet and heater, size of the synthetic jet nozzle and size of the synthetic jet volume. In order to make additional progress in enhancing the advancement of synthetic jet technology, it is vital to reviews relevant past research that falls within the area of the study. In addition, as compared to experimental efforts, the numerical technique may result in cost savings and time savings. The use of numerical simulation is essential for accelerating the improvement of the synthetic jet product since it opens up a large potential in the use of electronic devices.

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Synthetic jet actuator with two opposite diaphragms

Cited by 11 publications

References 31 publications

Acoustic and Flow Aspects of Synthetic Jet Actuators with Chevron Orifices

Acoustic and Flow Aspects of Synthetic Jet Actuators with Chevron Orifices

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

A Review of Experimentation of Synthetic Jet Cooling

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