Numerical Analysis of Gas-Liquid-Liquid-Solid Four-Phase Flow to Elucidate the Mechanism of Crack Suppression of Dry Particulate Thin Film by Liquid Bridge
| Project/Area Number |
19K05122
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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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| Review Section |
Basic Section 27010:Transport phenomena and unit operations-related
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| Research Institution | Hiroshima University |
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Principal Investigator |
Ishigami Toru 広島大学, 先進理工系科学研究科(工), 准教授 (70595850)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 四相流 / 数値シミュレーション / 粒子 / 自由界面 / phase field model / 自由界面運動 / 毛管力 / フェーズフィールドモデル / キャピラリーサスペンション / 乾燥 / 液架橋 / 直接数値シミュレーション |
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| Outline of Research at the Start |
本研究では，新規な気液液固4相流の計算機シミュレーションモデルを構築し，粒子間液架橋を伴う粒子分散液（キャピラリーサスペンション）による乾燥粒子薄膜のクラック抑制機構の解明を目指す。計算機シミュレーションモデルを構築した後，粒子・流体・界面物性を独立的かつ網羅的に変化させて，乾燥過程のシミュレーションを行い，現象の可視化，粒子間相互作用の解析を行うことで，クラック抑制機構の解明を行う。また，得られた知見をフィードバックして，クラック抑制に必要な粒子分散液の物性，ならびにバインダー液の種類や組成の提案を行う。
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| Outline of Final Research Achievements |
With the development of numerical analysis technology, it is possible to analyze not only two-phase systems but also three-phase systems such as solid-gas-liquid. On the other hand, more complex four-phase flow phenomena have been experimentally confirmed. The addition of an immiscible fluid suppresses cracking of dry thin films. This is a phenomenon of a four-phase system of gas phase, particles, continuous phase, and bridging fluid. In this study, a numerical simulation model of solid-gas-liquid-liquid four-phase flow was developed.
Numerical analysis of the particle collision process on the free interface, which is often reported in previous studies of solid-gas-liquid three-phase flows, is performed. Compared with the three-phase flow, the four-phase flow shows that the number of free interfaces in the four-phase flow case is large, and the particle motion becomes more complicated due to the interaction of the free interface motion and the capillary force acting on the particles.
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| Academic Significance and Societal Importance of the Research Achievements |
これまで全く報告例が無かった，固体粒子，気体，混和しない2種類からなる四相系の流れを予測・解析可能な数値シミュレーション手法を開発し，この手法を用いて，四相系の流れの特徴や機構を理解することに成功した。本研究で扱った乾燥薄膜や粒子の衝突現象だけでなく，産業プロセスにおける多くの混相流現象に応用可能である。
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Report
(4 results)
Research Products
(18 results)
