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Published on: May 9, 2021
Self-organization of ascending-bubble ensembles
E V Barmina1, N A Kirichenko, P G Kuzmin
1Wave Research Center of A.M. Prokhorov General Physics Institute of the Russian Academy of Sciences, 38 Vavilov Street, 119991 Moscow, Russian Federation.
Summary
Hydrogen bubbles self-organize into patterns on laser-treated aluminum surfaces in ammonia solution. This study reveals bubble jet dynamics and predicts pattern formation, aligning with experimental observations.
Area of Science:
- Physical Chemistry
- Fluid Dynamics
- Materials Science
Background:
- Laser treatment of aluminum surfaces in ammonia solutions generates hydrogen bubbles.
- The self-organization of these bubbles into specific patterns is an observed phenomenon.
Purpose of the Study:
- To experimentally and theoretically investigate the self-organization of hydrogen bubbles.
- To model the dynamics of bubble pattern formation on laser-treated aluminum.
Main Methods:
- Experimental observation of bubble dynamics and pattern establishment.
- Theoretical modeling using a continuum model of bubble jets.
- Derivation of bubble system pressure using an equation of state analogous to van der Waals.
Main Results:
- Experimental demonstration of stationary gas bubble pattern dynamics.
- Theoretical prediction of bubble alignment along bisectors of a square laser-treated area.
- Development of a model with a negative diffusion coefficient linked to pattern formation.
Conclusions:
- The study successfully models hydrogen bubble self-organization on laser-treated aluminum.
- The theoretical model aligns well with experimental observations of bubble patterns.
- A negative diffusion coefficient is proposed as a mechanism for symmetry breakdown and pattern emergence.
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