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

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K05122
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 27010:Transport phenomena and unit operations-related
• Research Institution: Hiroshima University
• Principal Investigator: Ishigami Toru 広島大学, 先進理工系科学研究科(工), 准教授 (70595850)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 四相流 / 数値シミュレーション / 粒子 / 自由界面

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.

Free Research Field

移動現象論

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。