Acoustic streaming outside spherical particles and parameter analysis of heat transfer enhancement

Jiang, Genshan; Yang, Yanfeng; Liu, Yue-chao; Jiang, Yu

doi:10.1016/j.euromechflu.2020.11.005

Cited by 9 publications

(3 citation statements)

References 32 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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“…Next, we show that the sudden increase in the liquid water volume can also be attributed to the rapid enhancement in heat transfer due to stronger acoustic streaming. Enhancement of heat transfer during acoustic streaming is reported in the literature. − When the ice detaches from the substrate and starts rotating with the acoustic streaming flow, the temperature of the drop is observed to rapidly increase with time, leading to a sharp increase in the water volume. We calculate the variation in the heat transfer coefficient at the ice and water interface by equating the convective heat transfer between water and ice and the thermal energy responsible for the melting of the ice as follows, h A normald ( T avg i , t − T avg w , t ) = ṁ L where T avg i , t and T avg w , t are respectively the average temperature of ice and water at time t , m ̇ denotes the mass of ice drop at different time intervals and is calculated from the equation: ṁ = prefix− ρ i normald V i , t normald t The variation of the heat transfer coefficient with time is presented in Figure d.…”

Section: Resultsmentioning

confidence: 92%

Deicing of Sessile Droplets Using Surface Acoustic Waves

et al. 2023

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Deicing has significant relevance in various applications such as transportation, energy production, and telecommunication. The use of surface acoustic waves (SAWs) is an attractive option for deicing as it offers several advantages such as localized heating, in situ control, low power, and system integration for highly efficient deicing. Here, we report an understanding of the dynamics of deicing of microlitre volume water droplets (1 to 30 μL) exposed to low power (0.3 W) SAW actuation using an interdigitated electrode on a piezoelectric (LiNbO 3 ) substrate. We study the time variation of the volume of liquid water from the onset of SAW actuation to complete deicing, which takes 2.5 to 35 s depending on the droplet volume. The deicing phenomenon is attributed to acoustothermal heating which is found to be greatly influenced by the loss of ice adhesion with the substrate and the acoustic streaming within the liquid water. Acoustothermal heating inside the droplet is characterized by the temperature distribution inside the droplet using infrared thermography, and acoustic streaming is observed using dye-based optical microscopy. A rapid enhancement in deicing is observed upon the detachment of ice from the substrate and the onset of acoustic streaming, marked by a sudden increase in the liquid water volume, droplet temperature, and heat transfer coefficient. The deicing time is found to increase linearly with droplet volume as observed from experiments and further verified using a theoretical model. Our study provides an improved understanding of the recently introduced SAW-based deicing technique that may open up the avenue for a suitable alternative to standard deicing protocols.

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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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Acoustic streaming outside spherical particles and parameter analysis of heat transfer enhancement

Cited by 9 publications

References 32 publications

Numerical Study of Baroclinic Acoustic Streaming Phenomenon for Various Flow Parameters

Numerical Study of Baroclinic Acoustic Streaming Phenomenon for Various Flow Parameters

Deicing of Sessile Droplets Using Surface Acoustic Waves

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

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