Acoustic and Flow Aspects of Novel Synthetic Jet Actuator

Smyk, Emil; Gil, Paweł; Gałek, Rafał; Przeszłowski, Łukasz

doi:10.3390/act9040100

Cited by 18 publications

(13 citation statements)

References 23 publications

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“…The probe was placed in the orifice axis and in the orifice outlet plane. The velocity measurement accuracy was described in detail in reference [3].…”

Section: Methodsmentioning

confidence: 99%

“…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%

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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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“…The probe was placed in the orifice axis and in the orifice outlet plane. The velocity measurement accuracy was described in detail in reference [3].…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Helmholtz Resonance Frequency of the Synthetic Jet Actuator

2021

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“…The significant impact on the SPL has an element used to the SJ generation (piezoelectric, loudspeaker, piston). Smyk et al [35] compared woofer and mid-range driver with a similar specification. The noise generated by the actuator with the mid-range driver was about 10 -14 dB higher than in the case of the actuator with the woofer.…”

Section: The Other Parametersmentioning

confidence: 99%

A review of acoustic aspect in synthetic jet

Szyca

Smyk

2021

MATEC Web Conf.

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The synthetic jet actuators are promising heat transfer enhancement devices. They are used in active cooling systems and the future may replace classic fan systems. Although the flow and the heat transfer parameters are very important, these devices must be quiet enough to be used in offices and other spaces. In this paper, the acoustic investigations of the synthetic jet are compiled and discussed. The impact of actuators design on generated noise and the possible ways to noise decreasing are presented. In the end, the list of gaps and challenges are presented for laying down the foundation for future research.

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“…The diaphragm creates pairs of vortex rings near the exit from the orifice, which increases heat transfer. Synthetic jets are particularly useful in the LED cooling systems and their technology is constantly being developed [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the LED lamp

2021

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LEDs are widely used light sources. Their main advantages are low power consumption, mechanical strength, high luminous efficacy, and a lifetime exceeding 50 000 hours. However, compared to other light sources, they are more sensitive to high temperatures. Heat is generated by converting electrical energy into radiant energy. The share of heat in this transformation describes the efficiency, but in the case of light sources, efficiency is not one of the basic parameters because only a part of the radiation produced is visible light, which interests the recipients. However, the temperature has a big influence on the properties and lifetime of LEDs. This article presents the results of temperature measurements of the LED lamp.

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Acoustic and Flow Aspects of Novel Synthetic Jet Actuator

Cited by 18 publications

References 23 publications

Helmholtz Resonance Frequency of the Synthetic Jet Actuator

Helmholtz Resonance Frequency of the Synthetic Jet Actuator

A review of acoustic aspect in synthetic jet

Experimental study of the LED lamp

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