Abstract
The film condensation of a downward flowing R-113 vapor on in-line bundles of horizontal finned tubes was experimentally investigated. The test sections were 3×15 bundles with or without two rows of inundation tubes at the top. Two tubes with flat-sided fins and four tubes with three-dimensional fins were tested. Heat transfer measurements were carried out on a row-by-row basis. The effect of the vapor velocity on the finned tube bundles was considerable smaller than the case of a smooth tube bundle. The decrease of the heat transfer coefficient due to the condensate inundation was small for tubes with flat-sided fins, while a considerable decrease was observed for tubes with three-dimensional fins. A tube with flat-sided fins of a small fin pitch (0.5 mm) showed the best heat transfer performance over the range of film Reynolds number tested (<2 500).
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