Integral transformation method to investigate flow characteristics of polymer solution from the phase transition perspective

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K22083
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 27:Chemical engineering and related fields
• Research Institution: Kobe University
• Principal Investigator: Hidema Ruri 神戸大学, 工学研究科, 准教授 (20598172)
• Co-Investigator(Kenkyū-buntansha): 谷田部 然治 熊本大学, 大学院先導機構, 助教 (00621773) ; 鈴木 洋 神戸大学, 工学研究科, 教授 (90206524)
• Project Period (FY): 2019-06-28 – 2022-03-31
• Keywords: 複雑流体 / 相転移 / 分布

Outline of Final Research Achievements

To clarify characteristic flow regimes of complex fluids such as polymer solutions and surfactant solutions, interactions of inner structure in the fluids were quantified by using a method of micro-rheology. Optical tweezers were used as a tool of micro-rheology; the motion of a trapped particle was analyzed to obtain distribution of local fluids properties around the bead that reflects the complexity of the fluids. Relaxation time of the fluids measured under the extensional stresses was also used to characterize inner structures. Then, flow regimes of these solutions in flow channels in micro and macro length scales were observed, which was affected by enhancement of inner structure of the fluids.

Free Research Field

複雑流体のレオロジー

Academic Significance and Societal Importance of the Research Achievements

低濃度で流動中にのみ特異な挙動を示すため定量化することが難しかった複雑流体内部の特徴を，マイクロレオロジー手法による計測とその解析により，分布を用いて定量化した上で，溶液の流動現象と対応させる可能性を見いだしたことに学術的な意義がある．得られた知見は，工業的に多用される複雑流体の流動場制御にも適用でき社会的な意義があるうえ，流体以外の様々な相転移現象に適応できる可能性もあり発展性がある．