Effect of Fin on Forced Convection Heat Transfer Around a Tube

Abstract

Effect of fin on heat transfer around a tube was investigated experimentally. A test tube of 30 mm diameter was installed in a test section of an open type wind tunnel as a single tube, or as a center tube in a single tube row and in a tube bundle of staggered layout. Fins made by paper were put on the test tube having certain fin spacing. It was clarified from the experiment, that the local heat transfer coefficient around the tube degrades with decreasing fin spacing, especially on the down-stream-side of the tube, and the minimum fin spacing where the effect of fin begins to appear is the largest for the single tube and the smallest for the tube bundle.