Abstract
An experiment of heat transfer of turbulent air flow was carried out through the abruptly expansion rectangular duct. The reattachment flow region was defined by evaluation the local static pressure difference on the wall. The measurement of temperature distribution in the slow was also conducted. Several problems found from the experiment were furthermore investigated by other's data. As the heat transfer characteristics were resulted to depend upon the distance from the inlet to the reattachment on the duct wall, a local Nusselt number equation was proposed considering the factor of duct expansion area ratio. The observed maximum heat transfer coefficient near the reattachment point was influenced by the remarkable greater temperature gradient, which reduced the apparent heat transfer rates, between separation bubble and main flow in the upstream separated slow region.
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