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Activating Molecules, Ions, and Solid Particles with Acoustic Cavitation
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Explosive cavitation in superheated liquid argon.

V E Vinogradov1, P A Pavlov, V G Baidakov

  • 1Institute of Thermal Physics, Ural Branch of the Russian Academy of Sciences, 106 Amundsen Street, Ekaterinburg 620016, Russia.

The Journal of Chemical Physics
|June 24, 2008
PubMed
Summary

Researchers studied explosive boiling of liquid argon under negative pressure. They determined key parameters like limiting superheats and nucleation rates, comparing results with homogeneous nucleation theory.

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Area of Science:

  • Thermodynamics
  • Fluid Dynamics
  • Materials Science

Background:

  • Investigating explosive boiling-up of liquid argon under extreme conditions is crucial for understanding phase transitions.
  • Negative pressures are generated by reflecting compression pulses from a liquid's free surface.

Purpose of the Study:

  • To investigate the kinetics of explosive boiling-up of liquid argon at negative pressures.
  • To determine the limiting superheats (T(*)), effective nucleation rate (J(*)), and nucleation rate derivative (G(T)).
  • To compare experimental findings with homogeneous nucleation theory.

Main Methods:

  • Utilizing liquid pulse heating on a thin platinum wire with a high heating rate (approx. 1 K/μs).
  • Employing experimental data from thermal perturbation of a wire probe.
  • Solving the problem of the initial stage of explosive boiling-up.

Main Results:

  • Determined experimental values for limiting superheats (T(*)) and effective nucleation rate (J(*)).
  • Quantified the derivative of the nucleation rate G(T)=(d ln J/dT)(T=T(*)).
  • Observed phenomena related to explosive boiling-up kinetics under negative pressure.

Conclusions:

  • Experimental data on explosive boiling-up of liquid argon were obtained under specific negative pressure conditions.
  • The determined kinetic parameters provide insights into the boiling process.
  • Comparison with homogeneous nucleation theory aids in validating theoretical models.