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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Investigation of Heat Exchange and Hydrodynamics Parameters in Annular Channels with Interacting Swirling Flows

Get access (open in a dialog) DOI: 10.1615/IHTC15.hte.009062
pages 3925-3935

Sinopsis

In this paper there is represented the method of heat transfer enhancement on a convex surface, based on the use of interacting swirling flows. The description of the experimental setup is represented. Test section is an annular channel with a heated tube. The heating of the section is a tube with outer diameter is 12.9 mm and a wall thickness is 1.5 mm. Along the heating 8 mounted thermocouples are mounted. These thermocouples attached to the inner surface of the tube, which allows to measure the temperature field along the length of the test section. Test section placed in the pressured vessel. The inner diameter of the pressured vessel is 16.3 mm. Heat transfer intensification was supported by organization of interacting swirling flows in the annular channel. Intensifier was a swirled wire wrapped on the tube. On the outer surface of the heating installed longitudinal ribs or spacers for mounting the wire. Main parameters of intensificator: intensificator swirling step t = 30÷100 mm, rib height h = 0÷1,5 mm. Experiments parameters: absolute pressure p = 3,0÷7,0 MPa, coolant mass velocity ?w = 1200÷5600 kg/(m2?c), coolant temperature t = 100÷200 oC. The test experiments tests on a smooth annular channel are made. The description of the intensifier is represented. The results of experiments are presented. It shown that heat transfer coefficient increases by 1.8 times.