Acoustic streaming in an ultrasonic air pump with three-dimensional finite-difference time-domain analysis and comparison to the measurement

Wada, Yuji; Koyama, Daisuke; Nakamura, Kentaro

doi:10.1016/j.ultras.2014.06.015

Cited by 8 publications

(4 citation statements)

References 23 publications

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“…Recent experiments and numerical simulations revealed complexity and difficulties in capturing the streaming phenomenon [7,[21][22][23][24][25][26][27][28]. Natural convection and acoustic streaming were shown to be difficult to separate in the laboratory and numerical challenges resulted from the need to capture compressible fluid dynamics on temporal scales ranging from the acoustic-wave period to the slow time scale over which the streaming flow evolves.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Baroclinic Acoustic Streaming Phenomenon for Various Flow Parameters

et al. 2022

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The article presents a numerical study of the large-amplitude, acoustically-driven streaming flow for different frequencies of the acoustic wave and different temperature gradients between hot and cold surfaces. The geometries studied were mainly two-dimensional rectangular resonators of different lengths, but also one three-dimensional rectangular resonator and one long and narrow channel, representative of a typical U-shaped resistance thermometer. The applied numerical model was based on the Navier–Stokes compressible equations, the ideal gas model, and finite volume discretization. The oscillating wall of the considered geometries was modeled as a dynamically moving boundary of the numerical mesh. The length of the resonators was adjusted to one period of the acoustic wave. The research confirmed that baroclinic acoustic streaming flow was largely independent of frequency, and its intensity increased with the temperature gradient between the hot and cold surface. Interestingly, a slight maximum was observed for some oscillation frequencies. In the case of the long and narrow channel, acoustic streaming manifested itself as a long row of counter-rotating vortices that varied slightly along the channel. 3D calculations showed that a three-dimensional pair of streaming vortices had formed in the resonator. Examination of the flow in selected cross-sections showed that the intensity of streaming gradually decreased as it approached the side walls of the resonator creating a quasi-parabolic profile. The future development of the research will focus on fully 3D calculations and precise identification of the influence of the bounding walls on the streaming flow.

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Section: Introductionmentioning

confidence: 99%

Numerical Study of Baroclinic Acoustic Streaming Phenomenon for Various Flow Parameters

et al. 2022

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“…It is particularly difficult to separate the natural convection from the acoustic streaming. This requires considering the dynamics of compressible fluids on temporal scales ranging from the acoustic wave period to the slow time scale over which the streaming flow evolves (Hyun et al 2005, Aktas and Ozgumus 2010, Parvizian et al 2014, Wada et al 2014, Karlsen et al 2018, Michel and Chini 2019, Chen et al 2021, El Ghani et al 2021, Jiang et al 2021.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional numerical study of acoustic streaming phenomenon in rectangular resonator

Malecha¹

2023

Fluid Dyn. Res.

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The article presents a three -dimensional numerical study of the large-amplitude, acoustically driven streaming flow in rectangular resonator for different frequencies of the acoustic wave and different temperature regime, isothermal and 60K temperature difference between the top and bottom walls. The utilized numerical model was based on the Navier-Stokes compressible equations, the ideal gas model, and finite volume discretization. The oscillating wall of the resonator was modeled as a dynamically moving boundary of the numerical domain. The size of the resonators was adjusted to fit one period of the acoustic wave. The research revealed a stationary pair of streaming vortices in the resonator with a characteristic three -dimensional structure. Their intensity was much greater in the case of nonisothermal flow. The study of the impact of side walls on the intensity of streaming revealed its gradual decrease with approaching the walls, creating a quasiparabolic profile in the resonator. Interestingly, the relationship between the intensity of streaming and the frequency of the acoustic wave turned out to be not trivial and two maxima for different frequencies could be observed.

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“…Among them, microfluidic actuators driven by piezoelectric materials have attracted widespread attention at home and abroad. In recent years, studies on piezoelectric fluid actuators, such as piezoelectric hydraulic motor (Denkena et al, 2017; Qian et al, 2020), piezoelectric injection valve (Gu et al, 2015; Lu et al, 2016; Zhou et al, 2017), piezoelectric pump (Li et al, 2021; Zhao and Ji, 2019; Dau and Dinh, 2015; Wada et al, 2014; Zhang et al, 2017), and piezoelectric mixer (Nam and Lim, 2018; Wang et al, 2018) etc., are continuously surging. Piezoelectric pumps use the tiny vibration of the piezoelectric actuator to directly or indirectly drive the fluid, which can realize the accurate delivery and control of the fluid.…”

Section: Introductionmentioning

confidence: 99%

Design and investigation on an ultrasonic-excited piezoelectric gas jet pump

Wang

Dong

Gao

et al. 2022

Journal of Intelligent Material Systems and Structures

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To improve the gas driving performance of the piezoelectric gas driver, this paper proposes a piezoelectric gas jet pump that uses the ultrasonic near sound field of the piezoelectric transducer to excite the gas mass points to oscillate and form a gas jet. The working characteristics of the pump are studied theoretically and experimentally. The distribution law of the sound field excited by the transducer in the sixth-order vibration mode is obtained through simulation analysis. Then the prototypes are designed through calculating the Reynolds number and Stokes number of the gas jet excited by ultrasonic near sound field. And the calculation results show that there is a direct relationship between the gas driving ability of the jet pump and the radiated sound pressure of the transducer. On this basis, the experiments are conducted and the results show that the gas driving performance is significantly affected by the position of the jet hole. When the jet hole is arranged in the central area of the piezoelectric transducer, the gas driving performance of the jet pump is the best. When the driving voltage is 80 Vpp and the driving frequency is 20.4 kHz, the gas flow rate reaches 0.39 L/min.

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Acoustic streaming in an ultrasonic air pump with three-dimensional finite-difference time-domain analysis and comparison to the measurement

Cited by 8 publications

References 23 publications

Numerical Study of Baroclinic Acoustic Streaming Phenomenon for Various Flow Parameters

Numerical Study of Baroclinic Acoustic Streaming Phenomenon for Various Flow Parameters

Three-dimensional numerical study of acoustic streaming phenomenon in rectangular resonator

Design and investigation on an ultrasonic-excited piezoelectric gas jet pump

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