• Title/Summary/Keyword: Micro Fluidic Channel

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Effects of Packing Pressure and Time on Injection Molding of Plastic Micro-channel Plates (플라스틱 마이크로 채널 기판 사출성형 시 보압의 영향)

  • Woo, Sang-Won;Park, Si-Hwan
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.25 no.3
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    • pp.224-229
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    • 2016
  • Recently, polymeric micro-fluidic biochips with numerous micro patterns on the surface were fabricated by injection molding for realizing low-cost mass production of devices. To evaluate the effects of process parameters on large-scale micro-structure replication, a $50{\times}50mm^2$ tool insert with surface structures having a patterns of trapezoidal shapes (height: $30{\mu}m$) was employed. During injection molding, PMMA was used; packing phase parameters and mold temperature were investigated. The replicated surface textures were quantitatively characterized by confocal laser microscopy with 10-nm resolution. The degree of replication at low mold temperatures was found to be higher than that at high mold temperature at the beginning of the packing stage. Thereafter, the degree of replication increased to a greater extent at higher mold temperatures; application of higher mold temperatures improved the degree of replication.

A Study on the Passive Microvalve Applicable to Drainage Device for Glaucoma

  • Sim, Tae-Seok;Kim, Yong-Kweon
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.2 no.4
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    • pp.253-258
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    • 2002
  • This paper reports the design, modeling, fabrication and measurement of passive microvalves, which are applicable to glaucoma implants. The proposed microvalves were designed using fluidic theory. The microvalves consisted of microchannels and chambers. The microchannels had a constant fluidic resistance generating a pressure difference. Six kinds of microvalves were designed using fluidic equations for laminar flow and fabricated to examine the influences of chamber size, channel length and the shape of channel cross section. The pressure difference between the designed microvalve and the fabricated microvalve was measured to be less than 4%.

Fabrication of a Micro fluidic Lens having variable focal length (가변 초점거리 마이크로 유체렌즈 제작)

  • Lee J.S.;Park J.G.;Kim G.M.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.10a
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    • pp.572-575
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    • 2005
  • A microlens connected to microfluidic channel is fabricated. The microlens is sealed with an elastomeric membrane which deforms by pressure of fluid driven by a syringe pump resulting in the shape change of the microlens. The optical properties of the microlens could be controlled by changing the microlens shape. The microlens system were made of an elastomer, PDMS, using molding from a photoplastic master patterned by UV photolithography. The test results show the optical property of the lens could be made into convex and concave type by applying the fluidic pressure positive and negative.

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Fabrication and Simulation of Fluid Wing Structure for Microfluidic Blood Plasma Separation

  • Choe, Jeongun;Park, Jiyun;Lee, Jihye;Yeo, Jong-Souk
    • Applied Science and Convergence Technology
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    • v.24 no.5
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    • pp.196-202
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    • 2015
  • Human blood consists of 55% of plasma and 45% of blood cells such as white blood cell (WBC) and red blood cell (RBC). In plasma, there are many kinds of promising biomarkers, which can be used for the diagnosis of various diseases and biological analysis. For diagnostic tools such as a lab-on-a-chip (LOC), blood plasma separation is a fundamental step for accomplishing a high performance in the detection of a disease. Highly efficient separators can increase the sensitivity and selectivity of biosensors and reduce diagnostic time. In order to achieve a higher yield in blood plasma separation, we propose a novel fluid wing structure that is optimized by COMSOL simulations by varying the fluidic channel width and the angle of the bifurcation. The fluid wing structure is inspired by the inertial particle separator system in helicopters where sand particles are prevented from following the air flow to an engine. The structure is ameliorated in order to satisfy biological and fluidic requirements at the micro scale to achieve high plasma yield and separation efficiency. In this study, we fabricated the fluid wing structure for the efficient microfluidic blood plasma separation. The high plasma yield of 67% is achieved with a channel width of $20{\mu}m$ in the fabricated fluidic chip and the result was not affected by the angle of the bifurcation.

A Numerical Study of Heat transfer and Flow Analysis for a Micro-channel in The Slip Flow Regime (Slip flow 영역에서의 미소채널 내 열전달 및 유동에 관한 수치적 연구)

  • Jeong, Soo-In;Kim, Kui-Soon;Kang, Boem-Soo
    • 유체기계공업학회:학술대회논문집
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    • 2006.08a
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    • pp.391-394
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    • 2006
  • In this paper, the thermal lattice Boltzmann method(TLBM) proposed by Guo et al.(2002) is applied to analyze the forced convective flow and heat transfer of 2-D micro channel. Nonequilibrium extrapolation boundary condition is adopted to simulate the velocity and temperature behavior at wall boundaries. Numerical results obtained by the present study give a good prediction of the micro fluidic characteristics with thermal effects.

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Experimental Studies on Thermal-Fluidic Characteristics of Carbon Dioxide During Heating Process in the Near-Critical Region for Single Channel (단일채널 내 임계영역 이산화탄소 가열과정의 열유동 특성에 관한 실험적 연구)

  • Choi, Hyunwoo;Shin, Jeong-Heon;Choi, Jun Seok;Yoon, Seok Ho
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.29 no.8
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    • pp.408-418
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    • 2017
  • Supercritical carbon dioxide ($sCO_2$) power system is emerging technology because of its high cycle efficiency and compactness. Meanwhile, PCHE (Printed Circuit Heat Exchanger) is gaining attention in $sCO_2$ power system technology because PCHE with high pressure-resistance and larger heat transfer surface per unit volume is fundamentally needed. Thermo-fluidic characteristics of $sCO_2$ in the micro channel of PCHE should be investigated. In this study, heat transfer characteristics of $sCO_2$ of various inlet conditions and cross-sectional shapes of single micro channel were investigated experimentally. Experiment was conducted at supercritical state of higher than critical temperature and pressure. Test sections were made of copper and hydraulic diameter was 1 mm. Convective heat transfer coefficients were measured according to each interval of the channel and pressure drop was also measured. Convective heat transfer coefficients from experimental data were compared with existing correlation. In this study, using measured data, a new empirical correlation to predict near critical region heat transfer coefficient is developed and suggested. Test results of single channel will be used for design of PCHE.

Precision assessment of micro abrasive jet machining result on glass by using thick SU-8 as a mask (SU-8 마스크를 이용한 유리의 입자분사 미세가공 정밀도 평가)

  • Saragih A.S.;Ko T.J.;Kim H.S.;Park Y.W.;Lee I.H.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.493-494
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    • 2006
  • SU-8 can be implemented as a mask for micro Abrasive Jet Machining (micro-AJM) process [1]. In this paper, we will evaluate the quality of micro grooving result on glass substrate by micro-AJM process which using SU-8 as a mask. It was evaluated on width and edge profile of the micro grooving. The result was having distortion compare with the master film used to pattern the SU-8 mask. The value of distortion with other properties which came along with it, such as depth and surface roughness, can be optimized in order to fabricate micro-channel for micro-fluidic application.

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Machinability in Micro-precision Machining of Ni-Plated Layer by Diamond Tool (다이어몬드 공구를 이용한 Ni 도금층의 정밀미세가공 시 절삭성)

  • Kim, Seon-Ah;Park, Dong-Sam
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.18 no.6
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    • pp.636-641
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    • 2009
  • Recently, expansion of micro-technology parts requires micro-precision machining technology. Micro-groove machining is important to fabricate micro-grating lens and many micro-parts such as microscope lens, fluidic graphite channel etc. Conventional groove fabrication methods such as etching and lithography have some problems in efficiency and surface integrity. But, mechanical micromachining methods using single crystal diamond tools can reduce these problems in chemical process. For this reason, microfabrication methods are expected to be very efficient, and widely studied. This study deals with machinability in micro-precision V-grooves machining of nickel plated layer using non-rotational single crystal diamond tool and 3-axis micro stages. Micro V-groove shape, chip formation and tool wear were investigated for the analysis of machinability of Ni plated layer.

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