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Stability criteria, atomization and non-thermal processes in liquids
1National University of Odessa, Romana Karmena 9a/2, Odessa UA-65044, Ukraine. s0x80@mail.ru
Ultrasonics Sonochemistry
|March 25, 2008
Summary
This study derives the atom work function for liquid-gas systems, revealing a negative work function linked to atomization. This finding supports a new two-stage sonoluminescence mechanism involving hyper-thermal atom emission.
Area of Science:
- Thermodynamics
- Physical Chemistry
- Statistical Mechanics
Background:
- The BBGKY hierarchy describes many-body systems.
- Liquid-gas phase transitions and stability are crucial in thermodynamics.
- Sonoluminescence involves light emission from collapsing bubbles.
Purpose of the Study:
- Derive an analytical expression for the atom work function from liquid to gas.
- Investigate the link between atom work function and liquid stability criteria.
- Propose a novel mechanism for sonoluminescence based on negative atom work function.
Main Methods:
- Analysis of the first equation in the BBGKY hierarchy.
- Application of I.Z. Fisher's classification for liquid stability.
- Thermodynamic modeling and calculations for argon.
Main Results:
- An analytical expression for the atom work function (liquid to gas) was derived.
- Fisher's criterion for liquid stability was shown to correspond to atomization.
- A negative atom work function, significantly exceeding thermal energy, was observed under specific conditions.
- A two-stage sonoluminescence mechanism involving hyper-thermal atom emission and subsequent gas-phase collisions was proposed.
Conclusions:
- The atom work function is intrinsically linked to liquid-gas phase transitions and stability.
- Negative atom work function states offer a new perspective on sonoluminescence.
- The proposed mechanism provides a non-thermal explanation for sonoluminescence flashes.
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