One remarkable phenomenon generated in an annular impinging jet is the formation of a reverse stagnation point at the center of the annular impinging jet on an obstacle or a flat plate. Because few of the heat transfer problems on the reverse stagnation flow have been reported so far, heat transfer at the reverse stagnation point has been experimentally studied by using the analogy between the heat transfer and the mass transfer of naphtha- lene. It was experimentally clarified that the flow pattern of the annular impinging jet was divided into three regions and that the Nusselt number at the reverse stagnation point had a weak dependency on the Reynolds number.
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