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2021 Fiscal Year Final Research Report

Exploration of the Nucleation Principle Underlying the Size Distribution Law of Bubble Nuclei Always Present in Water

Research Project

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Project/Area Number 19H02068
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 19010:Fluid engineering-related
Research InstitutionKyushu University

Principal Investigator

Tsuda Shinichi  九州大学, 工学研究院, 准教授 (00466244)

Co-Investigator(Kenkyū-buntansha) 渡邉 聡  九州大学, 工学研究院, 教授 (50304738)
片山 雄介  九州大学, 工学研究院, 助教 (20778815)
Project Period (FY) 2019-04-01 – 2022-03-31
Keywords水 / 気泡核 / 分子動力学 / 光学計測
Outline of Final Research Achievements

The size distributions of tiny invisible bubbles called as bubble nuclei in flowing water have a tendency to show a specific size distribution independent of the detailed difference of the qualities of water or experimental environments. In this study, a set of computer simulations called as molecular dynamics method was conducted to investigate how universally each bubble nucleus has a tendency to show such a specific distribution. As a result, it was strongly indicated that each nucleus essentially shows a tendency to form a specific distribution independent of the initial size distributions.

Free Research Field

流体工学

Academic Significance and Societal Importance of the Research Achievements

水中に含まれる気泡核の大きさの分布が,少なくとも分子のスケールと同程度の大きさの気泡核の状態にはほとんど依存することなく,ある特定の分布に近づいていく傾向があることを,コンピュータを用いた模擬実験によって,世界的に初めて示した点が学術的な意義である.一方で,この模擬実験によって得られるサイズの分布は,実験的に計測されている分布とは一致しておらず,分子のスケールよりも大きな空間スケールにおける研究の必要性を新たな学術的課題として示した点も,本研究成果の一つの意義となっている.

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Published: 2023-01-30  

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