미세 분석 시스템의 유동 소자에 관한 유동 해석
- Alternative Title
- An Analysis on Flow Fields in the Micro-Fluidic Devices of the Micro Total Analysis Systems
- Abstract
- Microfluidic system has been taken a growing interest due to the development of MEMS technology and the increasing use of micro-systems. Fluid dynamics phenomena in the micro-systems are quite different from those in the macro-systems. Recently, the flow fields in the microfluidic systems such as micro-pump, micro-channel and micro-mixer have been many researchers interest.
In the present study, it is an analysis on the flow fields in the micro-mixer and micro-pump to design the micro total analysis system(μ-TAS). Based on the analytical and numerical solution for the flow and concentration fields, one-, two- and three-dimensional flow channels are suggested. In one-dimensional(1-D) mixing channel, the flow is laminar and the concentration field is governed by diffusion. So, the pulsating flow is considered to increase the contact area and the pulsating frequency is pursued based on the numerical simulation results. In two-dimensional (2-D) mixing channel, the flow direction change periodically and then the mixing effect increase by the flow distortion and the race-track effect. To increase the mixing effect further, three-dimensional (3-D) mixing channel is analyzed. In 3D mixing channel, mixing effect is worse than the 2D mixing channel in the case of slow fluid velocity. However 3-D channel structure gives better mixing effect than 1-D or 2-D when the velocity exceeds a certain value.
And, the valveless micro-pump composed of PZT actuator and diffuser/nozzle flow channel is designed based on the numerical calculation by considering fluid-structural interaction. The characteristics of PZT actuation and the flow fields driven by the PZT actuation are analyzed by the CFD-ACE commercial code. The deformation of PZT actuator is in proportion to the voltage and the frequency of applied alternating current, and maximum deformation is appeared at the center of PZT actuator. Diffuser/nozzle element of which extension angle is 10° is considered and the flow patterns for different inlet/outlet pressures are investigated. Pumping flux is mainly dependant on applied voltage and slightly influenced by current frequency. The phase difference between applied voltage and flow flux during the suction and exhausting process exist and the applied current condition is restricted by the geometry of the pump chamber.
- Issued Date
- 2008
- Awarded Date
- 2008. 8
- Type
- Dissertation
- Alternative Author(s)
- Lee, Dong-Won
- Department
- 대학원 기계공학과
- Advisor
- 玄明澤
- Table Of Contents
- 제1장 서 론 1
1.1 연구 배경 1
1.2 연구 동향 2
1.2.1 마이크로 혼합기(micro mixer) 2
1.2.1 마이크로 펌프(micro pump) 3
제2장 미세 유로에서의 혼합 6
2.1 혼합 메커니즘 6
2.1.1 확산(diffusion)에 의한 혼합 6
2.1.2 물질 전달에 의한 혼합 7
2.2 1차원 미세 유로 혼합 해석 7
2.2.1 1차원 미세 유로 7
2.2.2 확산에 의한 혼합 8
2.2.3 맥동류(pulsation flow)에 의한 혼합 8
2.3 Hairpin 구조에서의 혼합 해석 14
2.3.1 Hairpin 미세 유로 14
2.3.2 Hairpin 미세 유로에서의 혼합 14
2.4 미세 유로의 해석 18
2.4.1 1차원 미세 유로의 해석 18
2.4.2 2차원 미세 유로의 해석 19
2.4.3 3차원 유로에서의 혼합 효과 20
2.4.4 미세 유로에서의 혼합 효과 비교 21
2.5 미세 유로의 혼합 해석 결과 41
제3장 밸브 없는(valveless) 마이크로 펌프의 해석 42
3.1 마이크로 펌프의 개요 42
3.1.1 마이크로 펌프 구동 원리 42
3.1.2 마이크로 펌프의 유동제어 44
3.1.3 밸브 없는 마이크로 펌프 45
3.2 PZT 액추에이터의 설계 및 해석 53
3.2.1 PZT 액추에이터의 압전 효과 53
3.2.2 PZT 액추에이터의 이론 53
3.2.3 PZT 액추에이터의 설계 57
3.2.4 PZT 액추에이터의 해석 58
3.3 디퓨저/노즐 요소에 대한 해석 71
3.3.1 디퓨저/노즐 요소 71
3.3.2 디퓨저 이론 71
3.3.3 디퓨져 요소 73
3.3.4 디퓨져/노즐 요소의 해석 73
3.4 밸브 없는 마이크로 펌프 80
3.4.1 밸브 없는 마이크로 펌프의 작동 원리 80
3.4.2 밸브 없는 마이크로 펌프의 이론 80
3.4.3 밸브 없는 마이크로 펌프 81
3.4.4 밸브 없는 마이크로 펌프의 해석 81
제4장 결 론 99
참고문헌 101
- Degree
- Doctor
- Publisher
- 제주대학교 대학원
- Citation
- 李東原. (2008). 미세 분석 시스템의 유동 소자에 관한 유동 해석
- Appears in Collections:
- Faculty of Applied Energy System > Mechanical Enginering
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