2022 Fiscal Year Annual Research Report
Purely Elastic Flow-induced Vibrations of Microcylinders : Viscoelastic Fluid-Structure Interaction in Microfluidics
| Project/Area Number |
20K14656
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| Research Institution | Okinawa Institute of Science and Technology Graduate University |
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Principal Investigator |
Hopkins Cameron 沖縄科学技術大学院大学, マイクロ・バイオ・ナノ流体ユニット, ポストドクトラルスカラー (50865954)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | Microfluidics / Complex Fluids / Fluid Mechanics / Viscoelasticity / Cylinder / Micelles / Instability / Polymers |
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| Outline of Annual Research Achievements |
In FY2022 we completed the projects from FY2021 on the flow of a viscoelastic fluid past a cylinder in a microchannel. We thoroughly characterised the purely elastic flow instabilities that can arise in this flow. Two papers on this topic were published in Soft Matter. The first paper examined viscoelastic flow past a cylinder with a diameter is 50% of the width of the microchannel. We discovered and characterised a novel flow instability that manifests upstream of the cylinder where large vortices form attached to the walls of the channel.
The second paper examined how the the size of the cylinder in the microchannel affects the flow of a viscoelastic fluid. If the cylinder is small enough, the instability manifests downstream of the cylinder. If the cylinder is large enough, the instability manifests upstream of the cylinder. We thoroughly characterised the effect of cylinder size on the nature of these instabilities and identified an overlap region where the instability upstream and downstream of the cylinder compete for dominance in the flow.
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