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

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

2008-12-13

arxiv.org/abs/0812.2507v1

Physics

Fluid Dynamics

4 gages, 6 figures

Scientific paper

10.1103/PhysRevLett.102.124501

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 $T_\phi(P)$. When the sample top temperature $T_t$ decreased below $T_\phi$, 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 $\lambda_{eff}^*$ that was an order of magnitude larger than the single-phase $\lambda_{eff}$. As $P$ approached the critical pressure, $\lambda_{eff}^*$ increased dramatically even though $H$ vanished. We attribute this phenomenon to an enhanced droplet-nucleation rate as the critical point is approached.

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