Measurements of heat transport, as expressed by the Nusselt number Nu, are reported for turbulent Rayleigh-B\'enard convection of water containing up to 120 ppm by weight of poly-[ethylene oxide] with a molecular weight of 4×10⁶ g/mole. Over the Rayleigh number range 5×10⁹Ra7×10¹⁰ Nu is smaller than it is for pure water by up to 10%.
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Ahlers et al. (2010) studied this question.
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