Journal of Enhanced Heat Transfer Theory and Application in High Performance Heat and Mass Transfer

ISSN for PRINT: 1065-5131

For Online Access

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2003, Volume10

Issue 4

116 pages

DOI: 10.1615/JEnhHeatTransf.v10.i4

Issue price - $138.00

Robert Kiml
Tokyo University of Agriculture and Technology, Department of Mechanical Systems Engineering, Koganei-shi,Nakacho 2-24-16,Tokyo 184-8588, Japan

Dr. Sadanari Mochizuki
Tokyo University of Agriculture and Technology, Department of Mechanical Systems Engineering, Koganei-shi, Naka-cho 2-24-16,Tokyo 184-8588, Japan

Dr. Akira Murata
Tokyo University of Agriculture and Technology, Department of Mechanical Systems Engineering, Koganei-shi, Naka-cho 2-24-16,Tokyo 184-8588, Japan

Heat transfer and pressure drop experiments were performed in a rectangular high aspect ratio channel (5:1, 45 ґ 9 mm) representing a turbine blade trailing edge cooling passage. The oblique ribs were attached to two opposing long side walls and were intended to function as secondary flow inducers as well as turbulators to improve the heat transfer of the both rib-roughened and rear (one of the short side walls) walls. The experiments were performed for three rib heights—h = 3 mm, h = 2 mm, and h = 1 mm (h-rib height)—for two rib arrangements, transverse (90°) and inclined (60°). It was verified that (1) the heat transfer enhancement on the rear wall was attributed to the rib-induced secondary flow, which carries the cold air from the passage core region toward the rear wall and enhances the heat transfer appreciably; and (2) heat transfer and pressure drop strongly deteriorate with a decreasing rib height because of the weakening of the rib-induced positive effects as a turbulence promoter and secondary flow inducer.

DOI: 10.1615/JEnhHeatTransf.v10.i4.70 Download article, 431-444 pages

Article price - $35.00

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