| Project/Area Number |
63460099
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Thermal engineering
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| Research Institution | Kyoto University |
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Principal Investigator |
SUZUKI Kenjiro Kyoto Univ., Dept. of Mech. Eng., Professor, 工学部, 教授 (00026064)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Hiroshi Kyoto Univ., Dept. of Mech. Eng., Instructor, 工学部, 助手 (90206524)
HAGIWARA Yoshimichi Kyoto Univ., Dept. of Mech. Eng., Associate professor, 工学部, 助教授 (50144332)
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| Project Period (FY) |
1988 – 1990
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| Project Status |
Completed (Fiscal Year 1990)
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| Budget Amount *help |
¥7,300,000 (Direct Cost: ¥7,300,000)
Fiscal Year 1990: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1989: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1988: ¥5,800,000 (Direct Cost: ¥5,800,000)
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| Keywords | Heat Transfer Augmentation / Recirculating Flow / Backward-Facing Step / Insertion of Cylinder / Heat Transfer Experiments / Flow Visualization / Laser Doppler Velocimetry / Numerical Computation / 後向きステップ流れ / 循環領域の非定常化 / 非定常数値計算 / 円柱によるかく乱 / 非定常数値解析 |
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| Research Abstract |
Experimental and numerical studies were performed to see if it possible to enhance the heat transfer in the downstream region of a backward-facing step, where heat transfer is normally deteriorated, by the insertion of cylindrical body near the top corner of the step.
From the results of the heat transfer experiment flow visualization and measurement of the averaged and fluctuating flow fields by LDV for the case when a cylinder was inserted, the following conclusions were obtained ;
1) When the cylinder was mounted at a proper position, a jet-like flow pattern emerged in the averaged velocity profile beneath the cylinder, and the recirculating flow was intensified.
2) The velocity fluctuation was intensified in the near wall region resulting in the effective augmentation of heat transfer.
3) These intensifications result the enhancement of deteriorated heat transfer in the recirculating flow region.
From the results of the numerical computation made for the backward-facing step flow obstructed by a square rod, it was concluded that the recirculating flow region can be destabilized when a square rod is properly mounted near the step, and that it causes the augmentation of heat transfer.
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