Measurement of a Temperature Field Generated by a Synthetic Jet Actuator using Digital Holographic Interferometry

Dančová, Petra; Psota, Pavel; Vít, Tomáš

doi:10.3390/act8010027

Cited by 10 publications

(3 citation statements)

References 62 publications

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“…In the case of SJs, the term "nozzle" is sometimes misused in relation to the orifices. Such abuse of the word "nozzle" can be observed, for example, in [20][21][22].…”

Section: Introductionmentioning

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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“…In the case of SJs, the term "nozzle" is sometimes misused in relation to the orifices. Such abuse of the word "nozzle" can be observed, for example, in [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Acoustic and Flow Aspects of Synthetic Jet Actuators with Chevron Orifices

Smyk

Markowicz

2021

Applied Sciences

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“…Digital holographic interferometry is a non-contact, non-invasive, whole-field, differential, and highly accurate experimental method for measuring quantities that affect the phase of a light wave passing through or reflected from the measured object [28,51].…”

Section: Off-axis Digital Holographic Interferometrymentioning

confidence: 99%

Digital Holographic Interferometry for the Measurement of Symmetrical Temperature Fields in Liquids

et al. 2021

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In this paper, we present a method of quantitatively measuring in real-time the dynamic temperature field change and visualization of volumetric temperature fields generated by a 2D axial-symmetric heated fluid from a pulsatile jet in a water tank through off-axis digital holographic interferometry. A Mach-Zehnder interferometer on portable platform was built for the experimental investigation. The pulsatile jet was submerged in a water tank and fed with water with higher temperature. Tomographic approach was used to reconstruct the temperature fields through the Abel Transform and the filtered back-projection. Averaged results, tomographic view, standard deviation and errors are presented. The presented results reveal digital holographic interferometry as a powerful technique to visualize temperature fields in flowing liquids and gases.

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“…DHI is a high precision, non-contact, non-invasive, non-destructive, and full-field optical metrology technique [6,7]. DHI is able to measure, with a very high sensitivity, variations in the physical properties of phase objects (i.e., a liquid sample in a glass container can be considered as a phase object), based on the comparison of wavefronts recorded as holograms at different instants in times or states of an object [8,9].…”

Section: Introductionmentioning

confidence: 99%

Digital Holographic Interferometry without Phase Unwrapping by a Convolutional Neural Network for Concentration Measurements in Liquid Samples

et al. 2020

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Convolutional neural networks (CNNs) and digital holographic interferometry (DHI) can be combined to improve the calculation efficiency and to simplify the procedures of many DHI applications. In DHI, for the measurements of concentration differences between liquid samples, two or more holograms are compared to find the difference phases among them, and then to estimate the concentration values. However, liquid samples with high concentration difference values are difficult to calculate using common phase unwrapping methods as they have high spatial frequencies. In this research, a new method to skip the phase unwrapping process in DHI, based on CNNs, is proposed. For this, images acquired by Guerrero-Mendez et al. (Metrology and Measurement Systems 24, 19–26, 2017) were used to train the CNN, and a multiple linear regression algorithm was fitted to estimate the concentration values for liquid samples. In addition, new images were recorded to evaluate the performance of the proposed method. The proposed method reached an accuracy of 0.0731%, and a precision of ±0.0645. The data demonstrated a high repeatability of 0.9986, with an operational range from 0.25 gL−1 to 1.5 gL−1. The proposed method was performed with liquid samples in a cylindrical glass.

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Measurement of a Temperature Field Generated by a Synthetic Jet Actuator using Digital Holographic Interferometry

Cited by 10 publications

References 62 publications

Acoustic and Flow Aspects of Synthetic Jet Actuators with Chevron Orifices

Acoustic and Flow Aspects of Synthetic Jet Actuators with Chevron Orifices

Digital Holographic Interferometry for the Measurement of Symmetrical Temperature Fields in Liquids

Digital Holographic Interferometry without Phase Unwrapping by a Convolutional Neural Network for Concentration Measurements in Liquid Samples

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