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Numerical method simulating ultrasonic cavity dynamics behavior

A numerical method and dynamics technology, applied in the direction of informatics, electrical digital data processing, special data processing applications, etc., can solve the problem of not being able to effectively capture the transient evolution law of ultrasonic cavitation collapse and the characteristics of cavitation collapse

Active Publication Date: 2016-09-28
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
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Problems solved by technology

Therefore, the R-P equation based on the hypothesis of spherical collapse cannot effectively capture the transient evolution law and characteristics of ultrasonic cavitation collapse.

Method used

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  • Numerical method simulating ultrasonic cavity dynamics behavior
  • Numerical method simulating ultrasonic cavity dynamics behavior
  • Numerical method simulating ultrasonic cavity dynamics behavior

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Embodiment Construction

[0037] The present invention will be described in further detail below according to the accompanying drawings and specific embodiments.

[0038] Such as figure 1 As shown, the present invention is a numerical method for simulating ultrasonic cavitation dynamics, and the specific steps include:

[0039] (1) Construct the control equation:

[0040] The governing equations include mass conservation equations and momentum equations in the ultrasonic field, as shown in formulas (1) and (2) respectively:

[0041] ▿ · u = 0 - - - ( 1 )

[0042] ρ ( φ ) ( ∂ u ∂ t + u · ▿ u ) ...

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Abstract

The invention provides a numerical method simulating ultrasonic cavity dynamics behaviors; the method comprises the following steps: 1, building control equations including an ultrasonic field conservation of mass equation and a momentum equation; 2, building an ultrasonic radiation force equation; 3, substituting the ultrasonic radiation force equation into the momentum equation, and nondimensionalizing the control equation; 4, resolving the nondimensionalized control equation, extracting needed flow field data, and thus simulating the ultrasonic cavity dynamics behavior. The numerical method can simulate ultrasonic cavity form changes, wherein the simulated ultrasonic cavity form change has small error with the real ultrasonic cavity form change, thus capturing ultrasonic cavity transient evolution rules and cavity collapse characteristics.

Description

technical field [0001] The invention relates to a numerical method for simulating the dynamic behavior of ultrasonic cavitation, and belongs to the technical fields of fluid mechanical engineering, multiphase flow and computational fluid dynamics. Background technique [0002] Ultrasonic cavitation is a nonlinear effect produced by the interaction between sound and liquid medium. When the partial pressure inside the liquid is reduced to the saturated vapor pressure of the liquid due to the action of sound waves, vaporization will occur, and the gas dissolved in the liquid will also precipitate out, forming bubbles (also known as voids, cavities). During the expansion and compression of sound waves, these bubbles exhibit dynamic behaviors such as oscillation, growth, contraction, and collapse, and the resulting series of physical and chemical changes are called ultrasonic cavitation. The thermal and mechanical effects caused by ultrasonic cavitation have been used in many fi...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06F19/00
CPCG06F30/20G16Z99/00
Inventor 王国玉马潇健黄彪高德明
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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