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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Visualization
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Journal DOI :
The Korean Society of Visualization
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Volume & Issues
Volume 9, Issue 4 - Dec 2011
Volume 9, Issue 3 - Sep 2011
Volume 9, Issue 2 - Jun 2011
Volume 9, Issue 1 - Mar 2011
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Nano/Biofluidics & Control Laboratory
Song, Si-Mon ;
Journal of the Korean Society of Visualization, volume 9, issue 2, 2011, Pages 3~11
Fabrication of Microcapsules Encapsulating Fluorescent Nanoparticles and Visualization of Their Inclusion
Kim, Eun-Young ; Kim, Hyoung-Hoon ; Go, Jeung-Sang ;
Journal of the Korean Society of Visualization, volume 9, issue 2, 2011, Pages 16~20
DOI : 10.5407/JKSV.2011.9.2.016
This paper presents a fabrication method of microcapsules encapsulating fluorescent nanoparticles sensitive to an organic liquid, which is potentially applicable to the encapsulation of protein, cell and drug. It uses the supra-molecular self-assembly of a block copolymer at the interface of the stable and controllable droplets of water suspended with fluorescent nanoparticles and the polymer solved organic. The size and uniformity of the microcapsules were examined for the various polymer concentrations by using SEM image analysis. The maximum standard deviation of the produced microcapsules of less than 3.5% was obtained from the microcapsules produced from the same conditions. The inclusion of fluorescent nanoparticles was visualized in the fluorescence microscope and by using TEM image. It is shown that this fabrication method can provide the uniform size microcapsules with a higher inclusion.
Analysis of 3-Dimensional Hydrodynamic Focusing in Circular Capillary Tube and Rectangular Microchannel
Yoon, Seong-Hee ; Kim, Kyung-Hoon ; Kim, Jung-Kyung ;
Journal of the Korean Society of Visualization, volume 9, issue 2, 2011, Pages 21~26
DOI : 10.5407/JKSV.2011.9.2.021
Hydrodynamic focusing technique to generate focused flow has been used for flow cytometry in microfluidic devices. However, devices with circular capillary tubes made of glass are not suitable for flow visualization or optical signal detection because the rays of light are distorted at the curved interface. We devised a new acrylic chamber assembled with a pulled micropipette and a rectangular microchannel made of glass. This new channel geometry enabled us to visualize the three-dimensional (3D) flow characteristics with confocal imaging technique. We analyzed the 3D hydrodynamic focusing in a circular capillary tube and a rectangular microchannel over a practical range of flow rates, viscosities and pressure drops.
Spray Characterization and Flow Visualization of the Supersonic Liquid Jet by a Projectile Impingement
Shin, Jeung-Hwan ; Lee, In-Chul ; Koo, Ja-Ye ; Kim, Heuy-Dong ;
Journal of the Korean Society of Visualization, volume 9, issue 2, 2011, Pages 27~33
DOI : 10.5407/JKSV.2011.9.2.027
Supersonic liquid jet discharged from a nozzle has been investigated by using a ballistic range which is composed of high-pressure tube, pump tube, launch tube and liquid storage nozzle. High-speed Schlieren optical method was used to visualize the supersonic liquid jet flow field containing shock wave system, and spray droplet diameter was measured by the laser diffraction method. Experiment was performed with various types of nozzle to investigate the major characteristics of the supersonic liquid jet operating at the range of total pressure of 0.8 from 2.14 GPa. The results obtained shows that shock wave considerably affects the detailed atomization process of the liquid jet and as the nozzle diameter decreases, the shock wave angle and the averaged SMD of spray droplet tends to decrease.
Fabrication and Performance Evaluation of Thin Film RTD Temperature Sensor Array on a Curved Glass Surface
Ahn, Chul-Hee ; Kim, Hyoung-Hoon ; Park, Sang-Hu ; Son, Chang-Min ; Go, Jeung-Sang ;
Journal of the Korean Society of Visualization, volume 9, issue 2, 2011, Pages 34~39
DOI : 10.5407/JKSV.2011.9.2.034
This paper presents a novel direct fabrication method of the thin metal film RTD temperature sensor array on an arbitrary curved surface by using MEMS technology to measure a distributed temperature field up to
without disturbing a fluid flow. In order to overcome the difficulty in the three dimensional photography of sensor patterning, the UV pre-irradiated photosensitive dry film resist technology has been developed newly. This method was applied to the fabrication of the temperature sensor array on a glass tube, which is arranged parallel and transverse to a main flow. Gold was used as a temperature sensing material. The resistance change was measured in a thermally controlled oven by increasing the environmental temperature. The linear increase in resistance change and a constant slope were obtained. Also, the sensitivity of each RTD temperature sensor was evaluated.
Flow Analysis around Tilt-rotor Aircraft at Various Tilt Angles
Kim, Su-Yean ; Choi, Jong-Wook ;
Journal of the Korean Society of Visualization, volume 9, issue 2, 2011, Pages 40~47
DOI : 10.5407/JKSV.2011.9.2.040
Tilt-rotor aircraft can be used in various fields because they have the capabilities of the vertical take-off and landing and the high-speed cruise flight. In the present study, the flow analysis of a tilt-rotor aircraft is conducted at various tilt angles. The lift and drag forces of the tilt-rotor aircraft are obtained and the wakes by the rotor-blade are visualized. The result shows that the rotor-blade affects the lift force in a hovering mode and the main wing has an influence on the lift force in a cruise mode. Additional thrust is required at the tilt angle of around 40 degree due to the least lift force. The drag force is dependent on the rotor-blade at overall tilt angles. The minus drag force appears between the tilt angles of 90 degree and 55 degree. Also, the drag force is dramatically increased at the other tilt angles. The wake by rotor-blade affects the flow around the fuselage of the tilt-rotor aircraft at the tilt angles of 75 degree and 60 degree.
The Experimental Study of EHD Printing for Different Nozzle Shapes
Kim, Ji-Young ; Nguyen, Vu Dat ; Byun, Do-Young ;
Journal of the Korean Society of Visualization, volume 9, issue 2, 2011, Pages 48~53
DOI : 10.5407/JKSV.2011.9.2.048
The shape of nozzle cross-section plays an important role in stabilizing electrospray jet. The angle of contact line is governed based on the famous Young-Laplace equation. Compared to a round nozzle that has a constant curvature along the orifice, the square nozzle has four square corner edges and four straight edges that hold the meniscus in a different manner and is of interest in this study. By utilizing both square and round capillary nozzle, we examine the effect of nozzle shape in electrohydrodynamic jetting. The ejections were recorded with a high speed camera and analyzed to examine the jetting repeatability based on dynamic movement of meniscus. The result suggests that if the corner edges are not sharp, then its effect on repeatability is also limited.
Numerical Simulation and Experimental Study on an Ejector System for VOC Recovery
Kim, Hyun-Dong ; Lee, Dong-Yeop ; Kim, Yoon-Kee ; Jeong, Won-Taek ; Ahn, Joo-Ha ; Kim, Kyung-Chun ;
Journal of the Korean Society of Visualization, volume 9, issue 2, 2011, Pages 54~60
DOI : 10.5407/JKSV.2011.9.2.054
This paper is a basic study on volatile organic compounds(VOC) recovery system in a crude oil carrier. VOC is easily evaporated in cargo tankers during loading and transportation of crude oil, causes serious environmental contamination and a huge economic loss. An ejector system is designed to mix VOC gas into crude oil flow to reduce VOC concentration. Detail two-phase flow inside the ejector is simulated using a commercial CFD code. To verify the numerical prediction, a scale-down experiment is conducted. Instead of crude oil and VOC, water and air are used as the working fluids. Flow characteristics and main parameters are obtained by two-phase flow visualization and PIV measurements. Air volume flow rate induced by the ejector is compared with respect to the volume flow rate of water using experimental and numerical results. Overall performance of the two-phase ejector predicted by the CFD simulation agrees well with that of the experiment.
Control of the Asymmetric Flow in a Supersonic Nozzle
Matsuo, Shigeru ; Setoguchi, Toshiaki ; Hashimoto, Tokitada ; Tokuda, Seiya ; Nagao, Junji ; Kim, Heuy-Dong ;
Journal of the Korean Society of Visualization, volume 9, issue 2, 2011, Pages 61~65
DOI : 10.5407/JKSV.2011.9.2.061
Several previous works on rocket nozzle flows have revealed the existence of the transition from FSS to RSS and the occurrence of asymmetric flow associated with the boundary layer separation, which can cause excessive side-loads of the propulsion system. Thus, it is of practical importance to investigate the asymmetric flow behaviors of the propulsion nozzle and to develop its control method. In the present study, the asymmetric flow control method using a cavity system was applied to supersonic nozzle flow. Time-dependent asymmetric flow was experimentally investigated with the rate of change of the nozzle pressure ratio. The results obtained showed that the cavity system installed on nozzle wall would be helpful in fixing the unsteady motions of the boundary layer separation, consequently reducing the possibility of the occurrence of the asymmetric flow.