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Cavitation inception from bubble nuclei.

K A Mørch1

  • 1Department of Physics , Technical University of Denmark, Kongens Lyngby 2800 , Denmark.

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|October 7, 2015
PubMed
Summary
This summary is machine-generated.

Water

Keywords:
cavitationcavitation nucleisurface nanobubblestensile strength

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Area of Science:

  • Fluid dynamics
  • Materials science

Background:

  • The tensile strength of ordinary water is limited by cavitation nuclei, not the water's intrinsic strength.
  • Cavitation nuclei are gaseous voids stabilized by a skin, maintaining gas diffusion balance.

Purpose of the Study:

  • To investigate the role of cavitation nuclei in water's tensile strength.
  • To explore the influence of transient pressures on cavitation nuclei and water tensile strength.

Main Methods:

  • Review of existing models for cavitation nuclei.
  • Experimental investigations of bubbles and cavitation inception.
  • Analysis of a recent model and experiments on transient pressure effects.

Main Results:

  • Cavitation nuclei, whether free bubbles or interfacial voids, govern water's apparent tensile strength.
  • Water quality and pressure-time history significantly affect the tensile strength of these nuclei.
  • Transient pressures can notably alter water's tensile strength by influencing cavitation nuclei.

Conclusions:

  • Water's low tensile strength is attributed to cavitation nuclei, not the liquid itself.
  • Understanding cavitation nuclei and pressure history is crucial for predicting water's tensile strength.
  • Transient pressure effects offer new insights into water's mechanical behavior.