| Budget Amount *help |
¥24,310,000 (Direct Cost: ¥18,700,000、Indirect Cost: ¥5,610,000)
Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Fiscal Year 2015: ¥15,210,000 (Direct Cost: ¥11,700,000、Indirect Cost: ¥3,510,000)
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| Outline of Final Research Achievements |
Addition of a little amount of polymers to water changes fluid properties drastically. Drag reduction, elastic instability, sudden increase of extensional viscosity of polymer solution are typical examples. In such complex phenomena, polymers may interact with each other in the flow, or polymers interact with the flow. Such interaction in micro scales induces non-uniform structure in fluids, which may affect fluid characteristics in macro scales. In order to clarify the hierarchic structure of polymer solution, we have conducted several experiments in each scale. We have measured polymer-polymer and polymer-fluid interaction in fluids by the drag force due to polymers and local viscosities of polymer solution by optical tweezers. Both are related to non-uniform structure in fluids. It was also clarified that the interactions and non-uniformity increase relaxation time of the polymer solution and viscoelastisity, which affects drag reduction and elastic instability.
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