• Title/Summary/Keyword: Particle motion analysis system

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Fabrication of Fluorescent Labeled Bi-compartmental Particles via the Micromolding Method (미세 성형 방법을 이용한 형광 표지된 이중 분획 입자의 제조)

  • Shim, Gyurak;Jeong, Seong-Geun;Hong, Woogyeong;Kang, Koung-Ku;Lee, Chang-Soo
    • Korean Chemical Engineering Research
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    • v.56 no.6
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    • pp.826-831
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    • 2018
  • This study presents fabrication of bi-compartmental particles labeled by multiple fluorescence. To compartmentalize fluorescent expression at the particle, two fluorescent dyes with less overlap of the excitation and emission spectra are selected. To ensure the fluorescence stability, the fluorescent dyes contain acrylate functional groups in the molecules so that they can be cross-linked together with monomers constituting the particle. Strong fluorescent expression and compartmentalization were observed at the particle fabricated using the selected fluorescent dyes through confocal microscopy. Furthermore, long-term fluorescence stability was verified by measuring fluorescent expression and intensity for 4 weeks. We anticipate that the bi-compartmental particles labeled by multiple fluorescence can be widely used for multi-target drug delivery system, analysis of 3 dimensional Brownian motion, and investigation of 3 dimensional complex self-assembled morphologies.

Numerical Analysis on the Pressure Distributions around a Circular Cylinder by Control Rods (제어봉에 의한 원형실린더 주위의 압력분포에 관한 수치해석)

  • Gim, Ok-Sok;Lee, Gyoung-Woo;Cho, Dae-Hwan
    • Journal of Navigation and Port Research
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    • v.31 no.6
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    • pp.485-490
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    • 2007
  • The purpose in having a control rod on a buoy system is to control the motion of it. The system may be composed entirely of a single circular cylinder and a long mooring anchor cable. A control rod has one function to perform in meeting its purpose, and that is to develop a control force in consequence of its orientation and movement relative to the water. The forces and moments generated as a result of the effects of mutual interference. then determine the stability characteristics of the body. In this paper, the study of control-rod-attached buoy's 2-dimensional section was accomplished. model tests and numerical simulations had been carried out with different diameters of control rods. and varying the Reynolds number $Re=5,000{\sim}25,000$ based on the cylinder diameter(D=50mm) to predict the performance of the body and the 2 frame particle tracking method Iud been used to obtain the velocity distribution in the flow field. 50mm circular cylinder Iud been used during the whole experiments and measured results had been compared with each other.

The Enhacned Atomization of Single Hole Nozzle by Cavitation at The Low Pressure Injection (저압 분사시 캐비테이션에 의한 단공 노즐의 미립화 향상)

  • Son, Jong-Won;Cha, Keun-Jong;Kim, Duck-Jool
    • Proceedings of the KSME Conference
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    • 2001.11b
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    • pp.952-957
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    • 2001
  • The objectives of this investigation were to obtain an excellent spray by cavitation under the low injection pressure. When cavitation occurs in the nozzle hole, the atomization of the liquid jet enhanced considerably. In this experiments, a acrylic nozzle made the gap and installed the bypass in the nozzle hole was used to enhance the atomization of the liquid jet at the low injection pressure. The liquid flow in the nozzle hole was photographed by a transmitted light using a micro flash. The spray angle was measured macroscope images of PMAS and the Sauter mean diameter was measured PDA system. To measure the pressure of the nozzle hole, pressure transducer was used. The results of this study indicated that enhanced atomization of the liquid jet at the low injection pressure was obtained by making the gap and installing the bypass at the single hole nozzle.

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The Effects of the Orifice Shapes on the Internal Visualization and The Spray Characteristics of the Single Hole Nozzle (오리피스 형상에 따른 단공 노즐의 내부 가시화와 분무 특성)

  • Son, Jong-Won;Cha, Keun-Jong;Kim, Duck-Jool
    • Journal of ILASS-Korea
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    • v.7 no.1
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    • pp.36-42
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    • 2002
  • The objective of this investigation was to obtain an excellent spray at the low injection pressure. When cavitation occurred in the nozzle hole the atomization of the liquid jet enhanced considerably. In this experiments, a acrylic nozzle which was installed the gap and installed the bypass in the nozzle hole was used to enhance the atomization of the liquid jet at the few injection pressure. The liquid flow in the nozzle hole was photographed by a transmitted light using a micro flash. The spray angle was measured by macroscope images of PMAS and the Sauter mean diameter was measured by PDA system. The pressure of the notate hole was measured by pressure transducer. It was found that enhanced atomization of the liquid jet at the low injection pressure was obtained by installing the gap and the bypass at the single hole nozzle.

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Analysis of Rear Closer of Vertical Launching System by Using Fluid-Structure Interaction Method (유체-고체 연성 해석 기법을 통한 수직발사대 후방 덮개의 거동 해석)

  • Lee, Younghun;Gwak, Min-cheol;Cho, Haeseong;Joo, Hyun Shig;Shin, Sang Joon;Yoh, Jai-ick
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2017.05a
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    • pp.664-671
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    • 2017
  • This paper presents a numerical analysis of behaviors of rear closer of vertical launch system under rocket plume based on fluid structure interaction analysis. The rocket plume loading is modeled by fully Eulerian method and elasto-plastic behavior of rear cover is calculated by total Lagrangian method based on a 9-node planar element. The interface motion and boundary conditions are described by a hybrid particle level-set method within the ghost fluid framework. We compare the fluid flow pattern between different rear closer models which are elast-plastic and rigid deformation.

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Implementation of Marine Optical Sensor System Using A Line-CCD (Line-CCD를 이용한 수중광학 센서 시스템의 구현)

  • Jeong, Ui-Seok;Lee, Dong-Ho;Lee, Kyoung-Woon;Lim, A-Ram;Jeong, Jae-Wook;Park, Jung-Ho
    • Journal of IKEEE
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    • v.14 no.3
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    • pp.244-249
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    • 2010
  • We fabricated optical sensor system that take a measurement particles using a line-CCD in ocean. To measure particles, we used 680nm laser diode which is appropriate. we tested to operate optical system in water tank and ocean. It has performance that detected signal of sensors transfer microprocessor, FPGA as long as move up and down it's motion. The system algorithm also analysis output -pressure, temperature, particle numbers in depth.-For experiment, our particle sensor system has high accuracy counter. therefore, we proposed that a line-CCD is available on optical sensor system in ocean.

Development of Stereoscopic PIV Measurement Technique and Its Application to Wake behind an Axial Fan (Stereoscopic PIV 기법의 개발과 이를 이용한 축류 홴 후류의 유동해석)

  • Yun, Jeong-Hwan;Lee, Sang-Jun
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.26 no.2
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    • pp.362-373
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    • 2002
  • A stereoscopic PIV (SPIV) measurement system based on the translation configuration was developed and applied to the flow behind a forward-swept axial-fan. Measurement of three orthogonal velocity components is essential for flow analysis of three-dimensional flows such as flow around a fan or propeller. In this study, the translation configuration was adopted to calculate the out-of-plane velocity component from 2-D PIV data obtained from two CCD cameras. The error caused by the out-of-plane motion was estimated by direct comparison of the 2-D PIV and 3-D SPIV results that measured from the particle images captured simultaneously. The comparison shows that the error ratio is relatively high in the region of higher out-of-plane motion near the axial fan blade. The turbulence intensity measured by the 2-D PIV method is bigger by about 5.8% in maximum compared with that of the 3-D SPIV method. The phase-averaged velocity field results show that the wake behind an axial fan has a periodic flow structure with respect to the blade phase and the characteristic flow structure is shifted downstream in the next phase.

Selection of Main Factors by Experimental Analysis for Profile Blast Machining Based on Microparticle Blasting Equipment with a Two-Axis Sequence Control Stage (2축 시퀀스 제어 스테이지와 미세입자 분사장치에 의한 형상 분사가공시 실험계획법에 의한 주요인자 검출)

  • Hwang, Chul-Woong;Lee, Sea-Han;Wang, Duck Hyun
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.19 no.11
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    • pp.64-69
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    • 2020
  • To determine the effective factors for microparticle blasting with precise sequence position control in the x-axis and y-axis directions, we conducted a statistical experimental analysis of blasted square shapes by considering five condition factors. The control input and output were operated simultaneously by rotation-linear motion conversion and fine particles were blasted onto the aluminum specimen by precise position control driving using multiple execution codes. The micro-driving device used for processing was capable of microparticle blasting and of controlling the system through contact with a limit sensor at high speed and a two-degree-of-freedom driving mechanism. Our experiments were conducted on 1,050 specimens of pure aluminum (containing <1% of other elements). The effects of several factors (e.g., particle and nozzle diameters, blasting pressure, and federate and blasting cycle numbers) on the surface roughness and blasted surface's depth were verified through a statistical experimental analysis by applying the dispersion analysis method. This statistical analysis revealed that the nozzle diameter, the blasting pressure, and the blasting cycle number were the dominant factors.

A Study on the Flow Control around a Circular Cylinder by Control rods (제어봉을 부착한 원형실린더 주위 유동제어에 관한 연구)

  • Gim, Ok-Sok;Lee, Gyoung-Woo;Cho, Dae-Hwan
    • Proceedings of KOSOMES biannual meeting
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    • 2007.05a
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    • pp.169-174
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    • 2007
  • The purpose in having a control rod an a buoy system is to control the motion of it. The system may be composed entirely af a single circular cylinder finder and a lang mooring anchor cable. A control rod has one function to perform in meeting its purpose, and that is to develop a control force in consequence of its orientation and movement relative to the water. The forces and moments generated as a result of the effects of mutual interference, then determine the stability characteristics of the body. In this paper, the study of control-rod-attached buoy's 2-dimensional section was accomplished. model tests and numerical simulations had been carried out with different diameters of control rods. and varying the Reynolds number $Re=5,000{\sim}25,000$ based an the cylinder diameter(D=50mm) to. predict the performance af the body and the 2 frame particle tracking method had been used to obtain the velocity distribution in the flaw field 50mm circular cylinder had been used during the whale experiments and measured results had been compared with each other.

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Numerical Analysis of Electro-Hydrodynamic (EHD) Flows in Electrostatic Precipitators using Open Source Computational Fluid Dynamics (CFD) Solver (오픈 소스 전산 유체 역학 해석 프로그램을 이용한 전기집진기 내부 정전 유동 해석)

  • Song, Dong Keun;Hong, Won Seok;Shin, Wanho;Kim, Han Seok
    • Particle and aerosol research
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    • v.9 no.2
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    • pp.103-110
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    • 2013
  • The electrostatic precipitator (ESP) has been used for degrading atmospheric pollutants. These devices induce the electrical forces to facilitate the removal of particulate pollutants. The ions travel from the high voltage electrode to the grounded electrode by Coulomb force induced by the electric field when a high voltage is applied between two electrodes. The ions collide with gas molecules and exchange momentum with each other thus inducing fluid motion, electrohydrodynamic (EHD) flow. In this study, for the simulation of electric field and EHD flow in ESPs, an open source EHD solver, "espFoam", has been developed using open source CFD toolbox, OpenFOAM(R) (Open Field Operation and Manipulation). The electric potential distribution and ionic space charge density distribution were obtained with the developed solver, and validated with experimental results in the literature. The comparison results showed good agreement. Turbulence model is also incorporated to simulate turbulent flow; hence the developed solver can analyze laminar and turbulent flow. In distributions of electric potential and space charge, the distributions become distorted and asymmetric as the flow velocity increases. The effect of electrical drift flow was investigated for different flow velocities and the secondary flow in a flow of low velocity is successfully predicted.