| Project/Area Number |
25420172
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Thermal engineering
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| Research Institution | Nagano National College of Technology |
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Principal Investigator |
Yoshiaki HANEDA 長野工業高等専門学校, その他部局等, 教授 (30218523)
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| Co-Investigator(Kenkyū-buntansha) |
SOUMA Akiko 長野工業高等専門学校, 機械工学科, 助教 (20632863)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
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| Keywords | 噴流 / 衝突噴流 / 熱伝達促進 / 流れの可視化 / 壁面せん断応力 / 熱伝達 / 凹面 / 伝熱促進 / impinging jet / 凸型 |
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| Outline of Final Research Achievements |
We examined characteristics of mean flow field of free jets issuing from the three kinds of exits with large aspect ratios opened along the convex surface of a semicylinder. It became clear that the mean velocity characteristics of the jet resemble them of two-dimensional jet closely. The jet impinged onto a concave surface. Furthermore, we examined local heat transfer coefficient on the concave surface when the flow was controlled with two pieces of semicircular plates which were set up parallel to the long sides of the jet exit and changed the distance between the semicircular plates. The impinging jet heat transfer characteristics improved very much in the cases of mounting the semicircular plates. When heat transfer improved, we understood that the jet vibrated almost symmetrically for the jet center axis.It was suggested that the local heat transfer coefficient on the concave surface was independent of the wall shear stress.
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