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This numerical study presents a simple but extremely effective way toconsiderably enhance heat transport in turbulent multiphase flows, namely byusing oleophilic walls. As a model system, we pick the  Rayleigh-B\'enard setup, filled with an oil-water mixture. For oleophilicwalls, e.g. using only $10\%$ volume fraction of oil in water, we observe aremarkable heat transport enhancement of more than $100\%$ as compared to thepure water case. In contrast, for oleophobic walls, the enhancement is thenonly about $20\%$ as compared to pure water. The physical explanation of thehighly-efficient heat transport for oleophilic walls is that thermal plumesdetach from the oil-rich boundary layer and are transported together with theoil phase. In the bulk, the oil-water interface prevents the plumes to mix withthe turbulent water bulk. To confirm this physical picture, we show that theminimum amount of oil to achieve the maximum heat transport is set by thevolume fraction of the thermal plumes. Our findings provide guidelines of howto optimize heat transport in thermal turbulence. Moreover, the physicalinsight of how coherent structures are coupled with one phase of a two-phasesystem has very general applicability for controlling transport properties inother turbulent multiphase flows.

Enhancing Heat Transport in Multiphase Rayleigh-B\'enard Turbulence by Changing the Plate-Liquid Contact Angles