Effect of vapor bubbles on velocity fluctuations and dissipation rates in bubbly Rayleigh-Bénard convection

Rajaram Lakkaraju, Laura E. Schmidt, Paolo Oresta, Federico Toschi, Roberto Verzicco, Detlef Lohse, Andrea Prosperetti

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17 Citations (Scopus)
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Abstract

Numerical results for kinetic and thermal energy dissipation rates in bubbly Rayleigh-Bénard convection are reported. Bubbles have a twofold effect on the flow: on the one hand, they absorb or release heat to the surrounding liquid phase, thus tending to decrease the temperature differences responsible for the convective motion; but on the other hand, the absorbed heat causes the bubbles to grow, thus increasing their buoyancy and enhancing turbulence (or, more properly, pseudoturbulence) by generating velocity fluctuations. This enhancement depends on the ratio of the sensible heat to the latent heat of the phase change, given by the Jakob number, which determines the dynamics of the bubble growth.
Original languageEnglish
Article number036312
Number of pages7
JournalPhysical review E: Statistical, nonlinear, and soft matter physics
Volume84
Issue number3
DOIs
Publication statusPublished - 2011

Keywords

  • IR-78799
  • METIS-278229

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