Formation of jet atomization using a steel plate vibrated by weakly coupled ultrasonic transducer through water

Matsuura, Hiroshi; Furukawa, Hiromitsu; Tanikawa, Tamio; Hashimoto, Hideki

doi:10.7567/1347-4065/ab4076

Cited by 3 publications

(2 citation statements)

References 31 publications

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“…Jet atomization 40) generates sprays in two dimensions as shown in Fig. 1(a) (white arrow), unlike ordinary atomization, which causes a spread in three dimensions [supplementary S1 (available online at stacks.iop.org/JJAP/61/085501/ mmedia)].…”

Section: Experiments and Resultsmentioning

confidence: 99%

“…[35][36][37] Therefore, there has been a high demand for methods to uniformly arrange fine particles such as drugs, DNA, and microplastics in two or three dimensions for the analyses of their properties. 38,39) The authors have been developing a jet atomization technique 40) to distribute various shapes and sizes of microplastics on a substrate uniformly by enclosing them in water droplets [41][42][43][44][45] to avoid their aggregation. [35][36][37] In this study, we investigate the optimal conditions for the efficient generation of jet atomization.…”

Section: Introductionmentioning

confidence: 99%

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Optimal conditions and generation mechanism of jet atomization for uniform distribution of nano- and micro-droplets

Matsuura¹,

Furukawa²,

Watanabe³

et al. 2022

Jpn. J. Appl. Phys.

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This study provides a jet atomization technique to uniformly distribute nano- and micro-particles on the substrate by enclosing them in water droplets to avoid their aggregation. Jet atomization is a two-dimensional uniform spray and is generated using a diaphragm. The ideal jet atomization was achieved when the diaphragm was highly hydrophilic (contact angle 9.8°), and the spring constant was approximately 1.27 N/m. The several experiments in this study supported the idea that jet atomization was caused by surface wave formed on the water film, rather than by boiling or cavitation of the water. The resonance between the diaphragm and the surface wave was investigated using a simple model. The results of this study can be expected to make fundamental contributions to pharmacy, medicine, and environmental science, where the uniform distribution of fine particles such as drugs, DNAs, and microplastics is required for the analyses of their properties.

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Section: Experiments and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimal conditions and generation mechanism of jet atomization for uniform distribution of nano- and micro-droplets

Matsuura¹,

Furukawa²,

Watanabe³

et al. 2022

Jpn. J. Appl. Phys.

Self Cite

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Acoustic analysis of jet atomization for uniform dispersion of nano- and micro-droplets

Matsuura

Furukawa

Kondo

et al. 2022

Journal of Applied Physics

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In this study, the mechanisms of jet atomization were analyzed based on a frequency analysis of atomization sounds in the audible range (∼20 kHz). Jet atomization is a two-dimensional, high-speed atomization using a diaphragm, and interesting acoustic signals and atomization phenomena were detected on hydrophobic and hydrophilic diaphragms. The hydrophilic diaphragm strongly interacted and resonated with the surface wave, resulting in symmetrical jet atomization relative to the diaphragm. The resonance between the diaphragm and the surface wave was supported by a calculation of the eigenfrequency of the diaphragm and the coincidence of the droplet diameters as calculated from Lang's equation. Notably, the diaphragm excited by the ultrasonic transducer acted as a new transducer vibrating perpendicular to the transducer. As a result, when the diaphragm and the surface wave were in resonance at 2.4 MHz, a symmetrical two-dimensional high-speed jet atomization was generated in the direction perpendicular to the transducer’s vibration direction. This study also revealed that the atomization state can be determined based on the acoustic analysis. This acoustic analysis of atomization sounds can be applied in more advanced atomization control, such as for providing uniform dispersions of droplets containing DNA, drugs, or microplastics.

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Numerical Analyses of Ultrasonic Atomization Utilizing Acoustic Effects of a Beam Diaphragm

Kondo,

Matsuura

2024

Applied Sciences

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To study mechanisms of jet atomization, a novel method of experimentation utilizing the resonation of diaphragms made from thin steel plates has been previously developed. In the experiments, a diaphragm covered by a film of water emitted acoustic sounds, and jet atomization from the water film was observed. Experiments using diaphragms composed of different materials and fast Fourier transformation analysis of the acoustic sound revealed that jet atomization occurred under limited surface conditions of the diaphragm and a specific range of frequency. In this article, the dynamics of a resonating body composed of the diaphragm and water film were analyzed using the finite element method with a combination of theoretical analyses of surface waves of water, such as the well-known Lang’s equation. The present FEA results, from harmonic response analyses with consideration of viscous damping effect due to interaction between the diaphragm and water film, precisely confirmed the results of FFT analysis previously obtained by the experiment. Specifically, the peak frequency of the frequency response agreed well with the FFT results, and the shift of the peak frequency and attenuation due to the interaction in the analyses corresponded with the difference in surface conditions between the hydrophilic and hydrophobic materials of the diaphragm in the experiments. Our interpretation of the mechanism of jet atomization is expanded by the present numerical results.

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Formation of jet atomization using a steel plate vibrated by weakly coupled ultrasonic transducer through water

Cited by 3 publications

References 31 publications

Optimal conditions and generation mechanism of jet atomization for uniform distribution of nano- and micro-droplets

Optimal conditions and generation mechanism of jet atomization for uniform distribution of nano- and micro-droplets

Acoustic analysis of jet atomization for uniform dispersion of nano- and micro-droplets

Numerical Analyses of Ultrasonic Atomization Utilizing Acoustic Effects of a Beam Diaphragm

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