| Project/Area Number |
15K05825
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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 | Kyoto University |
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Principal Investigator |
FUJIMOTO HITOSHI 京都大学, エネルギー科学研究科, 准教授 (40229050)
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| Co-Investigator(Kenkyū-buntansha) |
宅田 裕彦 京都大学, エネルギー科学研究科, 教授 (20135528)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | aqueous polymer / boiling heat transfer / flow visualization / spray cooling / droplet dynamics / スプレー冷却 / 水溶性ポリマー / 熱分解 / 沸騰熱伝達 / 対流 / 焼き入れ噴霧冷却 / 液滴 / 水溶性高分子ポリマー / 可視化実験 / 高分子ポリマー |
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| Outline of Final Research Achievements |
In the metal forming industry, quench hardening is commonly used to strengthen steel products by rapidly cooling hot materials with spray jets. One of the typical coolants is an aqueous polymer solution. During the hardening process, several phenomena occur simultaneously, namely, coolant boiling, separation of the polymer from the aqueous solution, and formation of a polymer-enriched layer on the solid surface. We developed experimental methods to observe these phenomena and explored that polymer-enriched layer formed temporarily at substrate temperatures higher than the temperature range for thermal decomposition measured by the thermogravimetric curve. The lifetime of this temporary polymer-enriched layer decreased as the substrate temperature increased. The lifetime was also influenced by the type of solid substrate. In addition, we found that aqueous polymer solution reduced heat transfer between droplets and substrate in some temperature range of solid.
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