This Proceeding contribution summarizes our results to be published in ref. [1]: The effectiveness of boiling as a heat transfer mechanism has been known for centuries and the process has formed the object of a very large number of studies [2]. The emerging vapor bubbles introduce a new parameter to the classical Rayleigh-Bénard convection [3], namely the Jacob number Ja=ρcp(Th−Tsat)/ρVL (1) in which L is the latent heat, ρV and ρ the vapor and liquid density, respectively, c p the liquid specific heat and T sat the saturation temperature of the liquid. Physically, Ja represents the ratio of the sensible heat to the latent heat. A very small Jacob number may be thought of as a very large value of the latent heat, which will tend to limit the volume change of the bubbles due to evaporation or condensation. For Ja = 0 the latent heat is effectively infinite and bubbles cannot grow or shrink.

Heat transfer mechanisms in bubbly Rayleigh-Benard convection

ORESTA, Paolo;
2009

Abstract

This Proceeding contribution summarizes our results to be published in ref. [1]: The effectiveness of boiling as a heat transfer mechanism has been known for centuries and the process has formed the object of a very large number of studies [2]. The emerging vapor bubbles introduce a new parameter to the classical Rayleigh-Bénard convection [3], namely the Jacob number Ja=ρcp(Th−Tsat)/ρVL (1) in which L is the latent heat, ρV and ρ the vapor and liquid density, respectively, c p the liquid specific heat and T sat the saturation temperature of the liquid. Physically, Ja represents the ratio of the sensible heat to the latent heat. A very small Jacob number may be thought of as a very large value of the latent heat, which will tend to limit the volume change of the bubbles due to evaporation or condensation. For Ja = 0 the latent heat is effectively infinite and bubbles cannot grow or shrink.
12th EUROMECH European Turbulence Conference
978-3-642-03085-7
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11589/25182
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