Intense cavitation at extreme static pressure

Area of Science:

• Physics
• Materials Science
• Acoustics

Background:

• Cavitation typically occurs at low hydrostatic pressures (around 0.1 MPa).
• Achieving intense acoustic cavitation at higher pressures has been limited by the lack of suitable apparatus.
• This limitation has hindered advancements in cavitation research and applications.

Purpose of the Study:

• To introduce a new high-pressure spherical resonator system for intense acoustic cavitation.
• To investigate cavitation phenomena at hydrostatic pressures ranging from 10 to 150 MPa.
• To explore the behavior of cavitation in water and liquid gallium under extreme conditions.

Main Methods:

• Utilized a novel high-pressure spherical resonator system.
• Employed the HYADES plasma hydrodynamics code for computational modeling.
• Conducted experiments using passive cavitation detection (PCD) and high-speed cameras.
• Measured shock wave amplitude and bubble cluster formation.

Main Results:

• Demonstrated intense acoustic cavitation at hydrostatic pressures between 10 and 150 MPa.
• Computational modeling predicted the formation of dense plasma with pressures 3-4 orders of magnitude higher than ambient.
• Experimental data confirmed a linear increase in shock wave amplitude and intense energy concentration in collapsing bubbles.
• Observed the formation of bubble clusters from single bubbles, amplifying energy output.

Conclusions:

• The new high-pressure system enables intense acoustic cavitation at significantly elevated hydrostatic pressures.
• The findings validate the formation of extreme conditions within cavitation bubbles and the amplification of energy by bubble clusters.
• This research paves the way for new applications requiring high-intensity cavitation.