Abstract
In this study, decaying turbulent swirl flow in a cylindrical tube is investigated experimentally. The swirl is generated with an innovative helical swirl flow generator. The tube surface is maintained at a constant temperature using a constant temperature water bath. Air is used as the working fluid. Experiments are conducted in a Reynolds number range between 20,000 and 56,000. Effects of the helical swirl generator length (h=15, 20, 25 and 30mm) and the tube length to diameter ratio (L/D=10, 20, 30 and 40) on the heat transfer and pressure drop are determined. It is disclosed that introducing swirl results in considerable enhancements in heat transfer, e.g. 348% for a specific test case. Effects of Re, h and L/D are found to be critically interdependent.
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