The forced-convection heat-transfer characteristics of an eutectic mixture of lead and bismuth were experimentally investigated* Data were obtained for lead-bismuth flowing in a circular tube with heat addition and for lead-bismuth flowing in an annulus with heat extraction from the inner surface. Data were also obtained with about 0.04 percent by weight of magnesium added to the lead-bismuth to promote wetting of the heat-transfer surfaces. The investigation covered an ever-all range of Peclet numbers from 250 to 3800.nThe results of the investigation showed that experimental values of Nusselt number for lead-bismuth fall considerably below values predicted by equations generally used for liquid-metal heat transfer. The addition of magnesium to the pure eutectic, to cause wetting of the heat transfer surfaces, did not change the heat-transfer characteristics of the lead-bismuth.
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