title: Effect of vapor bubbles on velocity fluctuations and dissipation rates in bubbly Rayleigh-Bénard convection.
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.
authors: Physics of Fluids Group, Faculty of Science and Technology, Impact and Mesa+ Institutes, and J. M. Burgers Center for Fluid Dynamics, University of Twente, NL-7500 AE Enschede, The Netherlands. r.lakkaraju@tnw.utwente.nl
authors: Rajaram
authors: R
authors: Lakkaraju
authors: Laura E
authors: LE
authors: Schmidt
authors: Paolo
authors: P
authors: Oresta
authors: Federico
authors: F
authors: Toschi
authors: Roberto
authors: R
authors: Verzicco
authors: Detlef
authors: D
authors: Lohse
authors: Andrea
authors: A
authors: Prosperetti