Numerical simulation of the nonlinear ultrasonic pressure wave propagation in a cavitating bubbly liquid inside a sonochemical reactor

Doğan, Hakan; Popov, Viktor

doi:10.1016/j.ultsonch.2015.11.011

Cited by 34 publications

(46 citation statements)

References 54 publications

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“…Bubbles are the building blocks of several applications from material science and sonochemsitry [6][7][8][9][10] to oceanography [4,5] and medicine [11][12][13]. Dynamics of bubbles are nonlinear and complex [15,[17][18][19][20] and to achieve their full potential in applications we need to have detailed understanding about the bubble response to exposure parameters of the acoustic field.…”

Section: Discussionmentioning

confidence: 99%

“…The presence of bubble however, changes the acoustic properties of the medium [31][32][33][34][35][36][37]. Changes in the acoustic properties are nonlinear and is a function of bubbles size, excitation frequency and pressure [34][35][36][37]. Because of the changes in the acoustic properties of the medium (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…It is shown in [35][36][37] that radiation damping is pressure dependent and can be a major contributor to the total damping and should not be neglected. A more complete estimation of the wave attenuation in bubbly media must incorporate the effects of thermal and radiation damping on bubble oscillations and the total dissipated power [34][35][36][37]. In this work we present a generalized model (GM) for the oscillations of coated bubbles.…”

Section: Introductionmentioning

confidence: 99%

“…In the 3 models, the first model neglects the thermal effects, the second model includes the thermal effects using linear approximations by introducing an artificial thermal viscosity [50] and the third model includes full thermal effects [49,[51][52][53] (full thermal model). The second model has widely been used in studies related to oceanography [4,5] or ultrasound contrast agent characterization [38][39][40][41][42]). In this paper we call this the linear thermal model.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear power loss in the oscillations of coated and uncoated bubbles: Role of thermal, radiation and encapsulating shell damping at various excitation pressures

Sojahrood

Haghi

et al. 2020

Ultrasonics Sonochemistry

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A simple generalized model (GM) for coated bubbles accounting for the effect of compressibility of the liquid is presented. The GM was then coupled with nonlinear ODEs that account for the thermal effects. Starting with mass and momentum conservation equations for a bubbly liquid and using the GM, nonlinear pressure dependent terms were derived for energy dissipation due to thermal damping (Td), radiation damping (Rd) and dissipation due to the viscosity of liquid (Ld) and coating (Cd). The dissipated energies were solved for uncoated and coated 2-20 µm bubbles over a frequency range of 0.25f r − 2.5f r (f r is the bubble resonance) and for various acoustic pressures (1kPa-300kPa). Thermal effects were examined for air and C3F8 gas cores in each case. For uncoated bubbles with an air gas core and a diameter larger than 4 µm, thermal damping is the strongest damping factor. When pressure increases, the contributions of Rd grow faster and become the dominant damping mechanism for pressure dependent resonance frequencies (e.g. fundamental and super harmonic resonances). For coated bubbles, Cd is the strongest damping mechanism. As pressure increases Rd contributes more to damping compared to Ld and Td. In case of air bubbles, as pressure increases, the linear thermal model largely deviates from the nonlinear model and accurate modeling requires inclusion of the full thermal model. However, for coated C3F8 bubbles of diameter 1-8 µm, typically used in medical ultrasound, thermal effects maybe neglected even at higher pressures. We show that the scattering to damping ratio (STDR), a measure of the effectiveness of the bubble as contrast agent, is pressure dependent and can be maximized for specific frequency ranges and pressures. 1

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nonlinear power loss in the oscillations of coated and uncoated bubbles: Role of thermal, radiation and encapsulating shell damping at various excitation pressures

Sojahrood

Haghi

et al. 2020

Ultrasonics Sonochemistry

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show abstract

“…[10][11][12][13][14][15] Sastre et al 10 used the wave equations and the Rayleigh-Plesset equations to study the propagating attenuation of nonlinear standing ultrasonic waves in bubbly liquids. Dogan et al 11 investigated the acoustic wave propagation in bubbly liquid inside a pilot sonochemical reactor by adopting a meshless numerical method to solve the Helmholtz equation.…”

Section: Introductionmentioning

confidence: 99%

A modified model for simulating the effect of temperature on ultrasonic attenuation in 7050 aluminum alloy

Han

Gong

et al. 2018

AIP Advances

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Knowing propagating properties of an ultrasonic wave can enhance the non-destructive testing techniques in alloy materials field, such as the electromagnetic acoustic transducer techniques, and the piezoelectric ultrasonic transducer techniques. When temperature is taken into consideration, the ultrasonic propagating attenuation become very complex process. In this paper, a loss factor coefficient function with change in temperatures is established and the loss factor damping model with temperature term is coupled into the equations of elastic wave motion. A modified frequency domain model for calculating the ultrasonic attenuation due to temperature changes in 7050 Aluminum alloy is then developed. The model is validated experimentally using a high power pulse transmitter/receiver RPR-4000, a resistant high temperature electromagnetic acoustic transducer set-up and a 7050 Aluminum alloy sample. The simulation and the experimental results are determined to be in good agreement. The numerical model is used to calculate the ultrasonic-waves field, the ultrasonic attenuation, and the ultrasonic propagation directivity considering the temperature effect. The modeling results indicate that the ultrasonic energy attenuation is significantly affected by temperature. When the temperature increases from 20 • C up to 480 • C, the ultrasonic energy attenuates by 32.31%. It is also found that the length of near acoustic field increases with the increase in temperature. There is a common basic mode for the attenuation of ultrasonic waves, in which the attenuated mode cannot be affected by other factors. Increasing the temperature or the frequency, the ultrasonic propagation can obtain an excellent directivity. Results obtained from the present model will provide a comprehensive understanding of design parameter effects and consequently improve the design/performance in the non-destructive testing techniques.

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Sonochemistry for Water Remediation: Toward an Up‐Scaled Continuous Technology

Kerboua¹,

Hamdaoui

2021

Applied Water Science

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Numerical simulation of the nonlinear ultrasonic pressure wave propagation in a cavitating bubbly liquid inside a sonochemical reactor

Abstract: Please cite this article as: H. Dogan, V. Popov, Numerical simulation of the nonlinear ultrasonic pressure wave propagation in a cavitating bubbly liquid inside a sonochemical reactor, Ultrasonics Sonochemistry (2015), doi: http://dx

Cited by 34 publications

References 54 publications

Nonlinear power loss in the oscillations of coated and uncoated bubbles: Role of thermal, radiation and encapsulating shell damping at various excitation pressures

Nonlinear power loss in the oscillations of coated and uncoated bubbles: Role of thermal, radiation and encapsulating shell damping at various excitation pressures

A modified model for simulating the effect of temperature on ultrasonic attenuation in 7050 aluminum alloy

Sonochemistry for Water Remediation: Toward an Up‐Scaled Continuous Technology

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