Heat transfer mechanisms in bubbly Rayleigh-Bénard convection

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Oresta, Paolo and Verzicco, Roberto and Lohse, Detlef and Presperetti, Andrea (2009) Heat transfer mechanisms in bubbly Rayleigh-Bénard convection. Physical Review E: Statistical, nonlinear, and soft matter physics, 80 (2). 026304. ISSN 1539-3755

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Abstract:The heat transfer mechanism in Rayleigh-Bénard convection in a liquid with a mean temperature close to its boiling point is studied through numerical simulations with pointlike vapor bubbles, which are allowed to grow or shrink through evaporation and condensation and which act back on the flow both thermally and mechanically. It is shown that the effect of the bubbles is strongly dependent on the ratio of the sensible heat to the latent heat as embodied in the Jakob number Ja. For very small Ja the bubbles stabilize the flow by absorbing heat in the warmer regions and releasing it in the colder regions. With an increase in Ja, the added buoyancy due to the bubble growth destabilizes the flow with respect to single-phase convection and considerably increases the Nusselt number.
Item Type:Article
Copyright:© 2009 The American Physical Society
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/73643
Official URL:http://dx.doi.org/10.1103/PhysRevE.80.026304
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