Bubbly liquid with multi-size bubble population

Svetlana Kovinskaya

Linear pressure waves in compressible fluids with multi-size bubble population are considered. The dispersive equation is investigated to determine the essential frequency band for the each sub-population. Separation of the resonance frequency bands of the neighboring sub-populations as an equilibrium criterion allows for determination of the bubble size distribution that matches experimental data. The energy radiated by the bubbles belonging to each sub-population is found. A dependency of the radiated energy on wavenumber is found. The developed model lets to understand the fundamental physical processes leading to the –5/3 power law scaling of oceanic ambient noise level with frequency known as the Knudsen spectrum.

Mots clés: bubble; fluid

Domaines: Acoustique [physics.class-ph]

Svetlana Kovinskaya. Bubbly liquid with multi-size bubble population. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811142⟩