Enhanced heat transport by turbulent two-phase Rayleigh-Bénard convection

Abstract

We report measurements of turbulent heat-transport in samples of ethane (C${}_2$H${}_6$) heated from below while the applied temperature difference $\Delta T$ straddled the liquid-vapor co-existance curve $T_{\varphi }(P)$. When the sample top temperature $T_t$ decreased below $T_{\varphi }$, droplet condensation occurred and the latent heat of vaporization $H$ provided an additional heat-transport mechanism.The effective conductivity ${\lambda }_{eff}$ increased linearly with decreasing $T_t$, and reached a maximum value ${\lambda }_{eff}^{\ast }$ that was an order of magnitude larger than the single-phase ${\lambda }_{eff}$. As $P$ approached the critical pressure, ${\lambda }_{eff}^{\ast }$ increased dramatically even though $H$ vanished. We attribute this phenomenon to an enhanced droplet-nucleation rate as the critical point is approached.

arXiv comment4 gages, 6 figures

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