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American Physical Society, Physical review E: Statistical, nonlinear, and soft matter physics, 3(84), 2011

DOI: 10.1103/physreve.84.036312

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

Journal article published in 2011 by Rajaram Lakkaraju, Le Laura Schmidt, Laura E. Schmidt, Paolo Oresta, Federico Toschi, Roberto Verzicco, Detlef Lohse, Andrea Prosperetti ORCID
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This paper is available in a repository.

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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.