Heat transfer in rotating scale-roughened trapezoidal duct at high rotation numbers |
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| Authors: | Shyy Woei Chang Tsun Lirng Yang Tong-Miin Liou Hong Guo Fang |
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| Affiliation: | 1. Thermal Fluids Laboratory, National Kaohsiung Marine University, No. 142, Haijhuan Road, Nanzih District, Kaohsiung City 81143, Taiwan, ROC;2. Department of Marine Engineering, National Kaohsiung Marine University, Taiwan, ROC;3. Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan, ROC;4. Department of Marine Engineering, National Kaohsiung Marine University, No. 142, Haijhuan Road, Nanzih District, Kaohsiung City 81143, Taiwan, ROC;1. Aerospace Research Institute and Sharif University of Technology, Tehran, 14665 834, Iran;2. Center for Research and Development in Space Science and Technology, Sharif University of Technology, Tehran, 145888 9694, Iran;3. Aerospace Research Institute, Ministry of Science, Research and Technology, Tehran, 14665 834, Iran;1. National Key Laboratory of Science and Technology on Aero Engines Aero-thermodynamics, Beihang University, Beijing 100191, China;2. School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China |
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| Abstract: | An experimental study of heat transfer in a radially rotating trapezoidal duct with two bevel walls roughened by deepened scales is performed with cooling applications to gas turbine rotor blades. Laboratory scale heat transfer data along the centerlines of two scale-roughened walls is generated within the parametric ranges of 7500 ? Re ? 15,000, 0 ? Ro ? 1.8 and 0.13 ? Δρ/ρ ? 0.42. No previous study has examined the heat transfer in a rotating scale-roughened channel and the present Ro range extends considerably from other researches to date. A selection of experimental data illustrates the individual and interactive impacts of Re, Ro and buoyancy number (Bu) on local heat transfer through which the manners of isolated and synergetic influences of Coriolis force and rotating buoyancy on heat transfer are examined. Local Nusselt number ratios between rotating and static channels on the stable (leading) and unstable (trailing) scale-roughened surfaces with Ro varying from 0.1 to 1.8 fall in the ranges of 0.8–2 and 1.1–2.5, respectively. Rotating buoyancy effects are weakened as Ro increases that impair local heat transfer for the present test configurations. Empirical heat transfer correlations for developed flow regions on two scale-roughened surfaces are derived that permit the evaluation of interactive and individual effects of Re, Ro and Bu on local heat transfer. |
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