The secondary Bjerknes force between two gas bubbles under dual-frequency acoustic excitation

Zhang, Yuning; Sheng-cai, LI

doi:10.1016/j.ultsonch.2015.08.022

Cited by 117 publications

(56 citation statements)

References 57 publications

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“…The effect of US treatment in food depends on various factors including frequency, power, medium's temperature, treatment's pressure, and nature of the treatment's liquid (Cao et al, ). However, frequency is a critical parameter that controls the behavior and yield of cavitation (Zhang, Zhang, & Li, ). Furthermore, it was reported that multifrequency sonication helped increase the cavitation activity by affecting the number of the active bubbles which eventually explode and generate higher temperature (Alenyorege et al, ).…”

Section: Introductionmentioning

confidence: 99%

Simultaneous multifrequency: A possible alternative to improve the efficacy of ultrasound treatment on cherry tomato during storage

Mustapha

Zhou

Sun

et al. 2019

J Food Process Preserv

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The productiveness of ultrasound (US) is affected by its frequency, power, and time, which has been reported to be very effective during food treatment when combined with other techniques of treatments. The study was aimed to evaluate the effect of mono-frequency (MFU), simultaneous dual-frequency (SDFU), and simultaneous tri-frequency US (STFU) at treatment times of 5-25 min on microbial inactivation and nutritional quality of cherry tomato. Results revealed that within 10 min of sonication, SDFU was most effective compared with MFU toward inhibiting the spoilage microorganisms, delaying ripening as well as maintaining firmness, total phenolic, flavonoid, and antioxidant of the fruit during 21 days of storage at 4°C. Although STFU caused a higher reduction in microbial load after treatment, it, however, showed several adverse effects on the fruit during storage. Overall, SDFU treatment had great potential in preserving shelf life and nutritional value of cherry tomato during storage. Practical applicationsUS treatment has been implemented toward improving the shelf life of fruit and vegetables. However, a high desirable result has been related to its combination with other physical or chemical methods. The remarkable inactivation of microorganisms obtained for the dual-and tri-frequency treatments under this study would contribute to the application of a nonthermal technique in the reduction of contaminants on ready-to-eat fresh products including cherry tomato. Furthermore, the positive effect of this treatment on the quality of the cherry tomato during storage indicated that this technique could be used to replace the common practice of combining US with chemical treatment in food preservation industries. Nevertheless, further exploration is needed toward determining the synergistic effect of these treatments with heat (thermosonication). | MATERIAL AND ME THODS | Chemicals and reagentsAnalytical grade chemicals and reagents obtained from Sinopharm Chem. Reagent, Ltd, China were used for this study. | Sample preparationMature red cherry tomatoes (Lycopersicon esculentum, cv. Jutou) were purchased from a local market in Zhenjiang (China) and stored for 24 hr at 4°C before used. Damaged or rotten tomatoes were removed and sorted to have unified sizes (11-13 g) and shapes (roundlike). Thereafter, it was washed with distilled water, dried by hand wiping with tissue papers and taken for treatment. | Simultaneous multifrequency US treatmentThe simultaneous multifrequency US (SMFU) (developed by Jiangsu University, China), is coupled with several frequency generators and maximum output power of 300 W. It can operate as mono-frequency US (MFU) and simultaneous multifrequency US (SMFU). The former operates on single frequency, while the latter works in simultaneous dual-frequency US (SDFU) and simultaneous tri-frequency US (STFU) modes. The simultaneous mode involved two or more frequencies with concurrently pulse on and off time. Wang et al. (2016) gives more details about the working mode, principles, and figures of ...

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Section: Introductionmentioning

confidence: 99%

Simultaneous multifrequency: A possible alternative to improve the efficacy of ultrasound treatment on cherry tomato during storage

Mustapha

Zhou

Sun

et al. 2019

J Food Process Preserv

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“…The dependence on the inter-bubble distance is explained qualitatively by linear or weakly nonlinear theories [45,9]. Subsequent research has looked into the effects of multiple scattering, nonlinearity, compressibility, shape oscillations, the coupling with the translation of the bubbles, and dual-frequency driving [36,37,11,31,3,16,35,44,21,46]. Suggestions have been made to use the force to manipulate bubbles as carriers of micro-devices [18,24,1].…”

Section: Introductionmentioning

confidence: 99%

The secondary Bjerknes force between two oscillating bubbles in Kelvin-Voigt-type viscoelastic fluids driven by harmonic ultrasonic pressure

Chen

Lai

Chen

et al. 2019

Ultrasonics Sonochemistry

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The interaction between two small bubbles experiencing transient cavitation in a nonlinear Kelvin-Voigt fluid is investigated. The time-delay effect in the interaction is incorporated in the coupled Keller-Miksis model. The refined model predicts that bubbles with radii smaller than 2µm will be repelled by large bubbles, in contrast to predictions from previous models. The matching pressure needed to obtain same level of transient cavitation in different Kelvin-Voigt fluids is shown to depend mainly on the shear modulus and is insensitive to other parameters, which makes it a useful parameter to correlate the results. When the radii of the bubbles fall between 4µm and 6µm, the secondary Bjerknes force obtained with matching pressures shows only weak dependence on the shear modulus. For the pressure amplitudes investigated, equilibrium distances can be found between two bubbles when the equilibrium radius of one of the bubbles is in a narrow range around 2µm. The equilibrium distance decreases when the shear modulus is increased. A simple relation between the two quantities is established.

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“…For example, the wave will be greatly attenuated by the oscillating bubbles within a short distance [33][34][35], leading to the frequency locking of the wave [34]. On the contrary, the acoustic wave could also manipulate the distributions of the bubbles through inducing the Bjerknes forces between them [36][37][38][39], leading to the coalescence of the bubbles. In the present model, for the sake of the simplicity, those effects are not accounted with neglecting the strong interactions between the waves and bubbles.…”

Section: Discussionmentioning

confidence: 99%

Rectified Diffusion of Gas Bubbles in Molten Metal during Ultrasonic Degassing

Zhang

2019

Symmetry

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In the present paper, an analytical solution of rectified diffusion of processes of gas bubbles in molten metal is derived for the purpose of predicting the diffusion behaviors of gas bubbles during ultrasonic degassing. In the present model, a theoretical threshold (in terms of the amplitude of the applied ultrasonic field) is determined for the evaluation of the ultrasonic degassing effects. The diffusion of hydrogen bubbles in molten aluminum is predicted, so as to provide examples to illustrate the important findings of the present work.

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The secondary Bjerknes force between two gas bubbles under dual-frequency acoustic excitation

Cited by 117 publications

References 57 publications

Simultaneous multifrequency: A possible alternative to improve the efficacy of ultrasound treatment on cherry tomato during storage

Simultaneous multifrequency: A possible alternative to improve the efficacy of ultrasound treatment on cherry tomato during storage

The secondary Bjerknes force between two oscillating bubbles in Kelvin-Voigt-type viscoelastic fluids driven by harmonic ultrasonic pressure

Rectified Diffusion of Gas Bubbles in Molten Metal during Ultrasonic Degassing

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