Abstract
In forced convective heat transfer in a horizontal straight pipe, buoyancy is considered to cause a serious difference between theoretical and experimental results. This report is devoted to the clarify the effect of buoyancy on this problem by accurate experiment on fully developed flow of air with constant heat flux. Velocity and temperature distributions are measured for large ReRa and these are shown to be essentially different from those known so far, for example, Poiseuille profile for velocity field. Nusselt numbers are calculated from measured velocity and temperature distributions and shown to be about twice as large as those calculated by neglecting buoyancy at ReRa=4×105. In the turbulent region, buoyancy gives little effect on velocity and temperature fields, but the critical Reynolds number is experimentally proved to be affected by buoyancy
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