2023 Fiscal Year Final Research Report
Why does salt adhere there? The corrosion environment of bridges from the physics of salt particle behavior
| Project/Area Number |
21K14232
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 22020:Structure engineering and earthquake engineering-related
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 飛来塩分 / 維持管理 / 数値流体解析 / 風洞実験 / 着雪 / 付着率 |
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| Outline of Final Research Achievements |
Rectangular prisms with the side ratio of 1 and 6 was investigated in detail by using computational fluid dynamics (CFD) to determine how particles are transported and adhered under the flow field formed around the cross section. We also proposed a method for estimating the amount of adhesion using physical quantities obtained from the pressure on the rectangular surface. Furthermore, the effects of particle velocity and angle of impact on the adhesion rate of particles impacting on the wall were clarified through snow deposition experiments in a low-temperature laboratory.
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| Free Research Field |
風工学，橋梁工学，維持管理工学
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| Academic Significance and Societal Importance of the Research Achievements |
橋梁の維持管理の観点からいえば，付着塩分量さらには部材の劣化の程度が重要であり，ある意味では塩分が付着に至る過程はどうでもよい．そのような状況において，あえて付着に至る過程に着目し，そこに潜む物理現象を解明したことに大きな意義がある．また，物体に接近する粒子は，その一部は物体を迂回したり，衝突はしても跳ね返ったりするが，そのような違いが十分に考慮されることは少ない．本研究では様々な手法を利用して厳密な付着率に取り組んでいるという点で大きな意義がある．
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