Cooling by Baroclinic Acoustic Streaming

Michel, Guillaume; Gissinger, Christophe

doi:10.1103/physrevapplied.16.l051003

Cited by 10 publications

(7 citation statements)

References 21 publications

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“…The latest works from 2021 [35,36] present numerical and experimental research, respectively. The first study examines the acoustic flow generated outside a two-dimensional spherical geometry for different frequencies and their effect on heat transfer.…”

Section: Introductionmentioning

confidence: 99%

“…The second of the works presents the experimental results of the streaming flow that causes a significant increase in heat transfer in a cavity filled with stably stratified air. Furthermore, the authors [36] showed that the temperature drop increases more than linearly with the increase of the temperature difference between the hot and cold surface. The authors of the work [37] have shown that streaming can occur not only in rectangular channels, but also in curved geometries.…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

confidence: 99%

Numerical Study of Baroclinic Acoustic Streaming Phenomenon for Various Flow Parameters

et al. 2022

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“…In the steady fields there are two dominating nonlinear effects in typical microscale acoustoflu-idic devices: (1) Thermal convection proportional to v 0 • ∇T 0 , which dominates over thermal diffusion proportional to ∇ 2 T 0 , when v 0 D th 0 /d ≈ 0.3 -1.5 mm/s for d = 100 -500 µm. Note that for larger systems convection becomes important at lower velocities, and in recent experimental studies this limit has been reached [8,24].…”

Section: An Iterative Procedures To Account For Nonlinear Effectsmentioning

confidence: 90%

Theory and modeling of nonperturbative effects at high acoustic energy densities in thermoviscous acoustofluidics

Joergensen¹,

Bruus²

2021

Preprint

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A theoretical model of thermal boundary layers and acoustic heating in microscale acoustofluidic devices is presented. It includes effective boundary conditions allowing for simulations in three dimensions. The model is extended by an iterative scheme to incorporate nonlinear thermoviscous effects not captured by standard perturbation theory. The model predicts that the dominant nonperturbative effects in these devices are due to the dependency of thermoacoustic streaming on gradients in the steady temperature induced by a combination of internal frictional heating, external heating, and thermal convection. The model enables simulations in a nonperturbative regime relevant for design and fabrication of high-throughput acoustofluidic devices.

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“…Concurrently, similar progress has been made in the theory of acoustic streaming, especially regarding thermoviscous effects. The fundamental boundary-driven streaming caused by time-averaged forces in the oscillatory boundary-layer flow [3], and the fundamental bulk-driven streaming generated by the timeaveraged dissipation of traveling waves [4], have recently been supplemented by bulk-driven baroclinic [5,6] and thermoacoustic [7,8] streaming, caused by an interplay between standing acoustic waves and steady temperature gradients. However, as noted in Refs.…”

mentioning

confidence: 99%

Transition from Boundary-Driven to Bulk-Driven Acoustic Streaming Due to Nonlinear Thermoviscous Effects at High Acoustic Energy Densities

Joergensen

Qiu²,

Bruus³

2023

Phys. Rev. Lett.

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Acoustic streaming at high acoustic energy densities E ac is studied in a microfluidic channel. It is demonstrated theoretically, numerically, and experimentally with good agreement that frictional heating can alter the streaming pattern qualitatively at high E ac above 400 J=m 3 . The study shows how as a function of increasing E ac at fixed frequency, the traditional boundary-driven four streaming rolls created at a halfwave standing-wave resonance transition into two large streaming rolls. This nonlinear transition occurs because friction heats up the fluid resulting in a temperature gradient, which spawns an acoustic body force in the bulk that drives thermoacoustic streaming.

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Cooling by Baroclinic Acoustic Streaming

Cited by 10 publications

References 21 publications

Numerical Study of Baroclinic Acoustic Streaming Phenomenon for Various Flow Parameters

Numerical Study of Baroclinic Acoustic Streaming Phenomenon for Various Flow Parameters

Theory and modeling of nonperturbative effects at high acoustic energy densities in thermoviscous acoustofluidics

Transition from Boundary-Driven to Bulk-Driven Acoustic Streaming Due to Nonlinear Thermoviscous Effects at High Acoustic Energy Densities

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