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Jet direction in bubble collapse within rectangular and triangular channels.

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Researchers studied liquid jet direction from collapsing vapor bubbles near polygonal boundaries. Analytical models accurately predicted jet direction in square and triangular channels, extending to other polygons.

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Area of Science:

  • Fluid dynamics
  • Multiphase flow
  • Acoustics

Background:

  • Vapor bubble collapse near boundaries generates high-speed liquid jets.
  • Previous studies focused on flat or parallel boundaries.
  • Jet direction is crucial for phenomena like cavitation erosion.

Purpose of the Study:

  • To experimentally investigate liquid jet direction from collapsing bubbles within enclosed polygonal boundaries.
  • To validate analytical models for predicting jet direction in corners.
  • To extend predictions to various polygonal geometries.

Main Methods:

  • Experimental measurement of liquid jet direction for bubble collapse in square and equilateral triangular channels.
  • Modeling the bubble as a sink in a potential flow.
  • Comparison of experimental results with analytical predictions.

Main Results:

  • Analytical solutions accurately predicted liquid jet direction within equilateral triangular and square channels.
  • The potential flow model effectively describes jet behavior in polygonal corners.
  • Predictions were extended to other polygons like rectangles and various right triangles.

Conclusions:

  • The study validates the use of potential flow models for predicting bubble-induced jet direction in polygonal geometries.
  • This research provides a framework for understanding and predicting jet behavior in complex confined spaces.
  • Findings have implications for fields involving bubble dynamics and boundary interactions.