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Enhanced Heat Transport by Turbulent Two-Phase Rayleigh-Benard Convection Jin-Qiang Zhong,1

Summary: Enhanced Heat Transport by Turbulent Two-Phase Rayleigh-Be┤nard Convection
Jin-Qiang Zhong,1
Denis Funfschilling,2
and Guenter Ahlers1
Department of Physics and iQCD, University of California, Santa Barbara, California 93106, USA
LSGC CNRS - GROUPE ENSIC, BP 451, 54001 Nancy Cedex, France
(Received 10 December 2008; published 23 March 2009)
We report measurements of turbulent heat transport in samples of ethane (C2H6) heated from below
while the applied temperature difference ┴T straddled the liquid-vapor coexistence curve T­PŮ. When
the sample top temperature Tt decreased below T, droplet condensation occurred and the latent heat of
vaporization H provided an additional heat-transport mechanism. The effective conductivity eff in-
creased linearly with decreasing Tt, and reached a maximum value ├
eff that was an order of magnitude
larger than the single-phase eff. As P approached the critical pressure, ├
eff increased dramatically even
though H vanished. We attribute this phenomenon to an enhanced droplet-nucleation rate as the critical
point is approached.
DOI: 10.1103/PhysRevLett.102.124501 PACS numbers: 47.27.te, 47.20.Bp, 47.55.db, 47.55.pb


Source: Ahlers, Guenter - Department of Physics, University of California at Santa Barbara


Collections: Physics