Numerical modelling of ultrasonic waves in a bubbly Newtonian liquid using a high-order acoustic cavitation model

The article deals with the process of post-harvest processing of vegetable crops. Attention is focused on the fact that the existing complex of machines does not allow to fully meet the agrotechnical requirements for the technological process of post-harvest processing of root crops. It is proposed to use ultrasonic action on root crops for cleaning them from soil impurities. Data on the effect of acoustic cavitation generated by ultrasonic waves with a frequency of 18-18.5 kHz at a power density of at least 1 W / cm² are given on the effect of acoustic cavitation on a root crop in a laminar flow of liquid. It is noted that multiple hydraulic cumulative shocks arising from the collapse of cavitation bubbles should separate soil impurities from root crops, which will significantly reduce the time and energy consumption during post-harvest processing of vegetable crops.

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Simulation of Acoustic Cavitation Bubble Motion by Lattice Boltzmann Method

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.580-583.3098 ◽

2014 ◽

Vol 580-583 ◽

pp. 3098-3105 ◽

Cited By ~ 2

Author(s):

Xi Zhou ◽

Ming Lei Shan ◽

Chang Ping Zhu ◽

Bing Yan Chen ◽

Cheng Yin ◽

...

Keyword(s):

Lattice Boltzmann ◽

Cavitation Bubble ◽

Acoustic Pressure ◽

Acoustic Cavitation ◽

Bubble Motion ◽

Cavitation Model ◽

Factors Affecting ◽

Motion Characteristic ◽

Major Factors ◽

Boltzmann Method

The motion characteristic of cavitation bubble is one of the major factors affecting acoustic cavitation. In this paper, a cavitation model coupled with acoustic pressure is established using lattice Boltzmann pseudopotential model. Aimed at demonstrating the feasibility of applying LB method in acoustic cavitation, the acoustic cavitation simulations are compared with the predictions of Keller equation. The comparison of theoretical prediction and numerical simulation shows that LB method is suitable for acoustic cavitation simulation.

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Decision letter for "A crabs’ high‐order brain center resolved as a mushroom body‐like structure"

10.1002/cne.24960/v2/decision1 ◽

2020 ◽

Keyword(s):

Mushroom Body ◽

High Order ◽

Brain Center

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Review for "A crabs’ high‐order brain center resolved as a mushroom body‐like structure"

10.1002/cne.24960/v1/review1 ◽

2020 ◽

Keyword(s):

Mushroom Body ◽

High Order ◽

Brain Center

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Determination of the Burgers vector of a dislocation in a Fe-Mn alloy by weak-beam image in HVEM

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100108799 ◽

1978 ◽

Vol 36 (1) ◽

pp. 330-331

Author(s):

Y. Ishida ◽

H. Ishida ◽

K. Kohra ◽

H. Ichinose

Keyword(s):

High Order ◽

Simulation Technique ◽

The Other ◽

Image Simulation ◽

Diffraction Vector ◽

Burgers Vector ◽

Weak Beam ◽

Beam Image ◽

Edge Component

IntroductionA simple and accurate technique to determine the Burgers vector of a dislocation has become feasible with the advent of HVEM. The conventional image vanishing technique(1) using Bragg conditions with the diffraction vector perpendicular to the Burgers vector suffers from various drawbacks; The dislocation image appears even when the g.b = 0 criterion is satisfied, if the edge component of the dislocation is large. On the other hand, the image disappears for certain high order diffractions even when g.b ≠ 0. Furthermore, the determination of the magnitude of the Burgers vector is not easy with the criterion. Recent image simulation technique is free from the ambiguities but require too many parameters for the computation. The weak-beam “fringe counting” technique investigated in the present study is immune from the problems. Even the magnitude of the Burgers vector is determined from the number of the terminating thickness fringes at the exit of the dislocation in wedge shaped foil surfaces.

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