Abstract
It has been established previously that, for heat transfer to a constant property fluid in a long pipe, an exponential wall heat flux ( q ∝ e yx ) leads to a fully-developed Nusselt number. Attention is drawn to the rapid decrease of Nu as the parameter γ is made increasingly negative. For wedge flow there is a corresponding family of thermal boundary conditions for which Nu is constant in the flow direction. If the familiar uniform wall heat flux were to be adopted without reflection for experiments with converging passages, significant reductions in Nu could well be observed and might be attributed to other effects in the accelerated flow.
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