We report measurements of turbulent heat transport in samples of ethane (C₂H₆) heated from below while the applied temperature difference ΔT straddled the liquid-vapor coexistence curve T_φ(P). When the sample top temperature Tₜ decreased below T_φ, droplet condensation occurred and the latent heat of vaporization H provided an additional heat-transport mechanism. The effective conductivity λeff increased linearly with decreasing Tₜ, and reached a maximum value λeff* that was an order of magnitude larger than the single-phase λeff. As P approached the critical pressure, λeff* 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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Zhong et al. (2009) studied this question.
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