Abstract
An experimental study of the forced convective heat transfer from groups of two, three and four contacting twisted insulated conductors, known as aerial bundled cables, is described. The local surface temperature is very non-uniform. The average Nusselt number/Reynolds number relationship is shown to depend on the choice of the characteristic length. The discontinuity in the Nu/ Re curve, which occurs at a critical Reynolds number Re crit = 5000 for a single smooth circular cylinder, also occurs with the bundled cables, but at a lower Reynolds number, depending on the number of cores in the cable. For Re < Re crit , the Nusselt number of a bundled cable is less than that of a single cylinder, but at Re < Re crit , it is greater. The Nusselt number for each cable configuration is given by Nu = CRe m , and values of C and m are tabulated for various ranges of Re from 800 to 4 × 10 4.
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