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ISSN Print: 1065-5131
ISSN Online: 1563-5074
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Effects of Rib Height on Heat Transfer Performance Inside a High Aspect Ratio Channel with Inclined Ribs
ABSTRACT
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.
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Saha Sujoy Kumar, Ranjan Hrishiraj, Emani Madhu Sruthi, Bharti Anand Kumar, Numerical Simulation of Integral Roughness, Laminar Flow in Tubes with Roughness and Reynolds Analogy for Heat and Momentum Transfer, in Insert Devices and Integral Roughness in Heat Transfer Enhancement, 2020. Crossref
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Jing Qi, Xie Yonghui, Zhang Di, Numerical investigation of flow and heat transfer in rotating trapezoidal channel with lateral slots and dimple structure, International Communications in Heat and Mass Transfer, 118, 2020. Crossref