| Project/Area Number |
07455091
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Thermal engineering
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| Research Institution | Tokyo University of Agriculture and Technology |
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Principal Investigator |
MOCHIZUKI Sadanari Tokyo Univ.of Agriculture and Technology, Faculty of Engineering, Professor, 工学部, 教授 (10013715)
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| Co-Investigator(Kenkyū-buntansha) |
MURATA Akira Tokyo Univ.of Agriculture and Technology, BASE,Associate Professor, 大学院・生物システム応用科学研究科, 助教授 (60239522)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥6,400,000 (Direct Cost: ¥6,400,000)
Fiscal Year 1996: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1995: ¥4,300,000 (Direct Cost: ¥4,300,000)
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| Keywords | Turbulent Heat Transfer / Heat Transfer Augmentation / Turbulence Promoter / Rotating System / Coriolis Force / Large Eddy Simulation / Finite Difference Method / 直接数値解析 |
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| Research Abstract |
In order to clarify the structure of turbulent flow governing the heat transfer in a rotating system, the experiments of smooth and rib-roughened ducts and the numerical analysis were performed. In the experiments, two different experimental setups were used. One is for straight-duct experiment and the other is for serpentine-duct experiment. The square-straight-duct results measured by using 204 thermocouples showed the variation of heat transfer coefficient in both streamwise and peripheral directions. The case of 90 degrees rib arrangement showed the locally maximum heat transfer between the two consecutive ribs. When the ribs were inclined to 60 degrees, the secondary flow induced by this inclination caused the augmentation in heat transfer. In the rectangular serpentine duct case, the rib inclination effect was examined changing the inclination angle from 45 to 90 degrees by using 458 thermocouples. The maximum heat transfer was obtained around the angle of 45-60 degrees.
In the numerical analysis, the rotating square smooth duct case was simulated by using the finite difference method. The Reynolds number defined by using the half side length and the friction velocity was 350 and the rotation number was varied from 0 to 1.0. Because of the computational resource limitation, the Smagorinsky model was introduced. The numerical results showed the effect of the Coriolis force on the peripheral variation of heat transfer and the laminarization near the suction side. When the extension to the more complicated duct configuration is considered, the introduction of the parallel computing technique and the universal sub-grid scale model will be essential as a next step.
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