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, and Andrea Prosperetti
Phys. Rev. E 84, 036312 – Published 19 September 2011

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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  • Received 27 June 2011

DOI:https://doi.org/10.1103/PhysRevE.84.036312

©2011 American Physical Society

Authors & Affiliations

Rajaram Lakkaraju1,*, Laura E. Schmidt1, Paolo Oresta2,3, Federico Toschi4, Roberto Verzicco1,5, Detlef Lohse1, and Andrea Prosperetti1,6,†

  • 1Physics 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
  • 2Dipartimento di Ingegneria dell’ Ambiente e per lo Sviluppo Sostenibile, Politecnico di Bari, Via De Gasperi, I-74123 Taranto, Italy
  • 3Dipartimento di Ingegneria dell’Innovazione, Universitá del Salento, Via per Arnesano, I-73100 Lecce, Italy
  • 4Department of Physics, Department of Mathematics and Computer Science, and J. M. Burgers Center for Fluid Dynamics, Eindhoven University of Technology, NL-5600 MB Eindhoven, The Netherlands
  • 5Department of Mechanical Engineering, University of Rome “Tor Vergata”, Via del Politecnico 1, I-00133 Rome, Italy
  • 6Department of Mechanical Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA

  • *r.lakkaraju@tnw.utwente.nl
  • prosperetti@jhu.edu

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Vol. 84, Iss. 3 — September 2011

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