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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

LOCAL HEAT TRANSFER AUGMENTATION IN CHANNELS WITH TWO OPPOSITE RIBBED SURFACES

Get access (open in a dialog) DOI: 10.1615/IHTC8.1420
pages 2885-2890

Résumé

The local heat transfer coefficient distribution of a square channel with two opposite ribbed walls was determined. The square channel was connected to a sudden contraction entrance in order to simulate the inlet condition of the turbine blade cooling passages. The test channel was heated by thin stainless steel foils with a thickness of 0.000025 m and instrumented with 180 thermocouples. The brass ribs of a square cross-section were glued periodically in-line onto the top and bottom walls of the foil-heated channel in patterns to achieve the desired spacing and angle-of-attack. The local heat transfer coefficients on the smooth side and the ribbed side walls, at the channel entrance and the downstream regions, were measured for eight rib configurations (e/D = 0.047, P/e = 10 and 20, α = 90°, 60°, 45°, and 30°) and three Reynolds numbers (Re = 10,000, 30,000, and 60,000).