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

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Lakkaraju, Rajaram and Schmidt, Laura E. and Oresta, Paolo and Toschi, Federico and Verzicco, Roberto and Lohse, Detlef and Prosperetti, Andrea (2011) Effect of vapor bubbles on velocity fluctuations and dissipation rates in bubbly Rayleigh-Bénard convection. Physical Review E: Statistical, nonlinear, and soft matter physics, 84 (3). 036312. ISSN 1539-3755

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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.

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Copyright:© American Physical Society
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/78799
Official URL:http://dx.doi.org/10.1103/PhysRevE.84.036312
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