• Title/Summary/Keyword: Micro-Channel

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A Study on the Ultra-Precision Polishing Technique for the Upper Surface of the Micro-Channel Structure (미세채널 구조물 상부의 초정밀 연마 기술 연구)

  • 강정일;이윤호;안병운;윤종학
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2003.10a
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    • pp.313-317
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    • 2003
  • Micro-Channel ultra-precision polishing is a new technology used in magnetic field-assisted relishing. In this paper, an electromagnet or the i18 of test system was designed and manufactured. A size of magnetic abrasive is used on 25~75${\mu}{\textrm}{m}$ and for the polish a micro-channel upper part. A surface of channel which is not even is manufactured using magnetic abrasive finishing at upper surface of micro-channel. As a result, the surface roughness rose by 80% after upper surface of micro- channel was polished up 8 minutes by polishing.

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Surface polishing of Micro channel using Magneto-Rheological fluid (MR유체를 이용한 미세 채널구조물의 표면연마)

  • 이승환;김욱배;민병권;이상조
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1873-1876
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    • 2003
  • Magneto-rheological polishing is a new technology used in precision polishing. It utilizes magneto-rheological fluid. nonmagnetic polishing abrasive, aqueous carrier fluids in magnetic field to remove material from a part surface. Silicon micro channel as work piece is fixed in the slurry which is made of MR fluid and CeO$_2$(10 vol%) abrasive particles. And permanent magnet rotate in the slurry to transfers magnetic force to abrasive particles by increasing yield strength of MR fluid. so, the obtained bottom surface roughness of micro channel by experiment reduced to Ra 0.010 $\mu\textrm{m}$ Rmax 0.103 $\mu\textrm{m}$ and finwall surface roughness of micro channel reduced to Ra 0.018 $\mu\textrm{m}$ Rmax 0.468 $\mu\textrm{m}$. At optimum conditions of variables, the workpiece as silicon micro channel have about 24 times smaller surface roughness than before polishing.

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On Micro-Channel Flow and Mixing: A Review (마이크로-채널 유동과 혼합 : 재검토)

  • Jayaraj, Simon;Suh, Yong-Kweon
    • 유체기계공업학회:학술대회논문집
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    • 2006.08a
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    • pp.301-304
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    • 2006
  • This paper presents a review of the important recent literature available in the area of micro-channel flow analysis and mixing. The topics covered include the physics of flows in micro-channels and integrated simulation of micro-channel flows. Also the flow control models and electro-kinetically driven micro-channel flows are explained. A comparison of various mixing principles in micro-channels are provided in sufficient detail.

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Micro-PIV Measurements of In Vitro Blood Flow in a Micro-Channel

  • Park, Cheol-Woo;Lee, Sang-Joon;Shin, Se-Hyun
    • International Journal of Vascular Biomedical Engineering
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    • v.1 no.2
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    • pp.30-35
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    • 2003
  • Flow characteristics of blood flow in a micro channel were investigated experimentally using a micro-PIV (Particle Image Velocimetry) velocity field measurement technique. The main objective of this study was to understand the real blood flow in micron-sized blood vessels. The Reynolds number based on the hydraulic diameter of micro-channel for deionized (DI) water was about Re=0.34. For each experimental condition, 100 instantaneous velocity fields were captured and ensemble-averaged to get the spatial distributions of mean velocity. In addition, the motion of RBC (Red Blood Cell) was visualized with a high-speed CCD camera. The captured flow images of nano-scale fluorescent tracer particles in DI water were clear and gave good velocity tracking-ability. However, there were substantial velocity variations in the central region of real blood flow in a micro-channel due to the presence of red blood cells.

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Micro-LIF Measurement in a Micro-channel Using an Micro Laser Light Sheet (마이크로 레이저 평면빔을 이용한 마이크로채널 내에서의 Micro-LIF 측정)

  • Yoon, Sang-Youl;Kim, Jae-Min;Kim, Su-Hun;Kim, Kyung-Chun
    • Proceedings of the KSME Conference
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    • 2004.11a
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    • pp.1540-1545
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    • 2004
  • Measurement of concentration fields in a micro-channel is the crucial technology in the area of Lab-on-a-chip to be used for various bio-chemical applications. It is wel-known that the only possible way to measure the concentration field in the micro-channel is using micro-LIF(Laser Induced Fluorescence) method. However, an accurate concentration field at a given cross plane in a micro-channel has not been made so far due to the limit of light illumination. The present study demonstrates a novel method to provide an ultra thin laser sheet beam having 5 microns thickness by a micro focus laser line generator. Nile Blue A was used as fluorescent dye for LIF measurement. The laser sheet beam illuminates an exact plane of concentration measurement in the micro-channel to increase the signal to noise ratio and reduce the depth uncertainty considerably.

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Experimental and Numerical Study on the Binary Fluid Flows in a Micro Channel (마이크로 채널 내의 이상유동에 대한 실험 및 수치해석적 연구)

  • Park, Jae-Hyoun;Heo, Hyeung-Seok;Suh, Young-Kweon
    • 한국가시화정보학회:학술대회논문집
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    • 2006.12a
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    • pp.86-91
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    • 2006
  • In this parer, we present the bubble forming and motion in the micro channel by using the two-dimensional numerical computation and experiment. In the numerical computation, The Lattice Boltzmann method(LBM) and free-energy model is used to treat the interfacial force and deformation of binary fluid system, drawn in to a micro channel and a numerical simulation is carried out by using the parallel computation method. The urn in this investigation is to examine the applicability of LBM to numerical analysis and experimental method of binary fluid separation and motion in the micro channel.

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An Experimental Study on the Transcription Characteristics of Injection-Molded Micro Channel (마이크로채널 전사성 향상을 위한 사출성형공정 최적화 기초연구)

  • Kim, J.S.;Ko, Y.B.;Min, I.K.;Yu, J.W.;Kim, J.D.;Yoon, K.H.;Hwang, C.J.
    • Transactions of Materials Processing
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    • v.15 no.9 s.90
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    • pp.692-696
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    • 2006
  • Micro fabrication of polymeric materials becomes increasingly important. And it is considered as a low-cost alternative to the silicon or glass-based Micro Electro-Mechanical System(MEMS) technologies. In the present study, micro channels were fabricated via LiGA(Lithographie, Galvanoformung, Abformung) process used for Capillary Electrophoresis(CE) chip. Taguchi method was applied to investigate the effects of process conditions in injection molding(melt temperature, injection speed, mold temperature and packing pressure) on the transcription characteristics of the micro channel. It was found that the skin layer disturbs a formation of micro channel. Furthermore, mold temperature and injection speed were two important factors to affect the replication characteristics of micro channel.

Flow Phenomena in Micro-channel Filling Process (II) - Numerical Analysis - (마이크로 채널 충전 과정의 유동 현상 (II) - 수치 해석 -)

  • Kim, Dong-Sung;Lee, Kwang-Cheol;Kwon, Tai-Hun;Lee, Seung-S.
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.27 no.5
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    • pp.657-665
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    • 2003
  • Several interesting results were obtained from the flow visualization experiment in the accompanying paper, Part I. in the present study, Part II, a numerical study has been carried out to explain the detailed flow phenomena in micro-channel filling process. Hele-Shaw flow approximation was applied to the micro-channel geometry based on the small characteristic length. And surface tension effect has been introduced on the flow front as the boundary condition with the help of a dynamic contact angle concept between the melt front and the wall. A dimensional analysis for numerical results was carried out and a strong relationship between dimensionless pressure and Capillary number is obtained. The numerical analysis results are compared with the flow visualization experimental observations. And the numerical system developed in the present study seems to be able to predict the interesting micro-channel filling flow characteristics observed from experiments.

Generation and Application of Atmospheric Pressure Glow Plasma in Micro Channel Reactor (마이크로 채널 반응기 내 상압 글로우 플라즈마 생성 및 응용)

  • Lee, Dae-Hoon;Park, Hyoun-Hyang;Lee, Jae-Ok;Lee, Seung-S.;Song, Young-Hoon
    • Proceedings of the KSME Conference
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    • 2008.11a
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    • pp.1869-1873
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    • 2008
  • In this work, to make it possible to generate glow discharge in atmospheric pressure condition with relatively high and wide electric field, micro channel reactor is proposed. Si DRIE and Cr deposition by Ebeam evaporation is used to make channel and bottom electrode layer. Upper electrode is made from ITO glass to visualize discharge within micro channel. Fabricated reactor is verified by generating uniform glow plasma with N2 / He gases each as working fluid. The range of gas electric field to generate glow plasma is from about 200 V/cm and upper limit is not observed in tested condition of up to 150 kV/cm. This data shows that micro channel plasma reactor is more versatile. Indirect estimation of electron temperature in this reactor can be inferred that the electron temperature within glow discharge in micro reactor lies $0{\sim}2eV$. This research demonstrates that the reactor is appropriate in application that needs to maintain low temperature condition during chemical process.

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