Dissertation/ Thesis
Analysis of microchannel flows with yield-stress fluid ; 미세 채널에서의 항복력 유체 흐름 분석
| العنوان: | Analysis of microchannel flows with yield-stress fluid ; 미세 채널에서의 항복력 유체 흐름 분석 |
|---|---|
| المؤلفون: | 박정원 |
| المساهمون: | 남재욱, Jungwon Park, 공과대학 화학생물공학부, 미세유체 및 코팅공정 |
| بيانات النشر: | 서울대학교 대학원 |
| سنة النشر: | 2020 |
| المجموعة: | Seoul National University: S-Space |
| مصطلحات موضوعية: | Flow visualization, Yield-stress fluid, Microchannel, Micro particle tracking velocimetry, Slip condition, Parameter estimation, 흐름 시각화, 항복력 유체, 마이크로채널, 마이크로 입자 추적 속도 측정법, 슬립 조건, 파라미터 예측, 660.6 |
| الوصف: | 학위논문 (석사) -- 서울대학교 대학원 : 공과대학 화학생물공학부, 2020. 8. 남재욱. ; In this paper, the flow of a polymer microgel, e.g. Carbopol, in microchannel was analyzed in consideration of the effect of microgel size and slip on the wall of microchannel. From the previous flow visualization experiment, we proposed a new system that channels can move in the opposite direction of flow. This not only shows the velocity of particles but also the overall pathlines at microchannel after fully-developed flow. With a new system and particle tracking velocimetry code, We conduct the study for two direction. First, we compare the velocity profiles obtained from flow visualizations and simulations in the mid-plane of the microchannel. Simulation with constitutive equation obtained from the rheological property did not coincide with velocity profile from visualizations. For example, the experimental results was slower than computation results near the wall. The reason for this phenomenon was explained by drawing pathlines of particles. Additionally, we suggest the method to find parameters for constitutive equations from the small-gap rheometry. When we compared with the results of flow visualization, it was reasonable. velocity profile from flow visualization. Second, we observe the effect of slip at wall on the velocity profiles. Unlike previous computation, which ruled out the effects of slip, the calculations proceeded with no slip condition. In our study, we consider both no slip condition and slip condition. For the fair comparison between experiment and computation results, we show that simulation with slip condition is close to the experimental results comparing with simulation with no slip condition. When we consider flow in the microchannel, we have to be careful on obtaining rheological property and considering slip condition. ; 이 연구에서는 벽에서의 슬립 현상과 미세 영역에서의 마이크로젤의 크기 비율로 인한 효과를 고려하여 마이크로 채널에서의 카보풀과 같은 고분자 용액의 흐름을 분석하고자 한다. 이전의 흐름 시각화 연구들에서 더 나아가, 마이크로 채널을 흐름의 반대 방향으로 움직일 수 있도록 새로운 시스템을 구축하였다. 이 시스템은 입자의 흐름뿐만 아니라 마이크로 채널의 전반적인 내부 입자 ... |
| نوع الوثيقة: | doctoral or postdoctoral thesis |
| اللغة: | English |
| ردمك: | 978-0-00-000000-2 0-00-000000-0 |
| Relation: | 000000161282; http://hdl.handle.net/10371/169456; http://dcollection.snu.ac.kr/common/orgView/000000161282; I804:11032-000000161282; 000000000043▲000000000048▲000000161282▲ |
| الاتاحة: | http://hdl.handle.net/10371/169456 http://dcollection.snu.ac.kr/common/orgView/000000161282 |
| رقم الانضمام: | edsbas.28DCCB73 |
| قاعدة البيانات: | BASE |
| ردمك: | 9780000000002 0000000000 |
|---|