2023 Fiscal Year Final Research Report
Development of Quench Phenomenon Prediction Model for Ultrafast Cooling of High Temperature Surfaces
| Project/Area Number |
22K20411
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0301:Mechanics of materials, production engineering, design engineering, fluid engineering, thermal engineering, mechanical dynamics, robotics, aerospace engineering, marine and maritime engineering, and related fields
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| Research Institution | Kyushu University |
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Principal Investigator |
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| Project Period (FY) |
2022-08-31 – 2024-03-31
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| Keywords | 沸騰 / クエンチ現象 / 金属多孔質体 / 液体窒素 |
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| Outline of Final Research Achievements |
When cooling a high temperature sample, film boiling occurs during the initial stage of cooling, in which the higeh temperature sample is covered by a vapor film. The vapor film causes the deterioration of heat transfer. The transition from film boiling to nucleate boiling is called the quench phenomenon. The early onset of this quench phenomenon has been a major issue for rapid cooling. In this study, cooling experiments were conducted using liquid nitrogen as the coolant. The rapid cooling of a high-temperature sample was performed using a porous material fabricated by electrodeposition on the surface of a copper block. The cooling time with the porous material block was reduced to one-tenth of that without. The mechanism of rapid cooling by the porous material was also clarified.
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| Free Research Field |
熱工学
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| Academic Significance and Societal Importance of the Research Achievements |
高温物体を急速冷却するニーズは，様々な産業分野でみられる．鉄鋼業界では，高温に熱した鉄を急速冷却することで鉄本来の性能を向上する焼入れが実施されている．ロケットに利用される液体燃料は，極低温流体であるため，ロケット構成物のすべての流路を極低温環境に冷却しなければならない．急速冷却できれば，極低温使用量の削減などコスト削減に寄与できる．以上のことから急速冷却技術の確立は，広く社会に黒衣kンすることができる．
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