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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 12, Issue 3 - Dec 2014
Volume 12, Issue 2 - Aug 2014
Volume 12, Issue 1 - Apr 2014
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Biophotonics and Biofluid Research Laboratory
Ahn, Yeh-Chan ;
Journal of the Korean Society of Visualization, volume 12, issue 1, 2014, Pages 7~10
Dynamics Response of a Micro Bubble under Temporal Pressure Variations
Lee, Woo Min ; Lee, Seung Hyun ; Sung, Jaeyong ; Lee, Myeong Ho ;
Journal of the Korean Society of Visualization, volume 12, issue 1, 2014, Pages 13~17
DOI : 10.5407/JKSV.2014.12.1.013
The growth of micro bubble has been simulated under the variation of ambient pressure. The Rayleigh-Plesset equation governs the dynamic growth and collapse of a bubble according to pressure and temperature conditions. The Rayleigh-Plesset equation was solved by 4th-order Runge-Kutta method for wide range of pressure variations. As numerical parameters, the pressure difference between initial and final pressures, and the temporal pressure gradient are changed. The results show that the pressure difference has little effect on the growth rate of the micro bubble in the inertia controlled growth region. On the other hand, the growth rate increases linearly with the increase of the pressure gradient.
PIV Measurement of Velocity Profile in the 1/8 Scale CANDU6 Moderator Circulation Test
Kim, Hyoung Tae ; Seo, Han ; Chan, Jae Eun ; Bang, In Cheol ;
Journal of the Korean Society of Visualization, volume 12, issue 1, 2014, Pages 18~24
DOI : 10.5407/JKSV.2014.12.1.018
The Korea Atomic Energy Research Institute (KAERI) has a scaled-down moderator test program to simulate the CANDU6 moderator circulation phenomena during steady state operation and accident conditions. In the present work a preliminary experiment using a 1/8 scaled-down moderator tank has been performed to identify the potential problems of the flow visualization and measurement in the scaled-down moderator test facility. With a transparent moderator tank model, a velocity field is measured with a Particle Image Velocimetry (PIV) technique under an isothermal state. The flow patterns from the inlet nozzles to the top region of the tank are investigated using PIV for a 1/8 scale moderator tank.
Quantitative Visualization of Outlet Flow of the Centrifugal Blower
Tu, Xin Cheng ; Kim, Sung-Jun ; Park, Seung Ha ; Kim, Hyoung-Bum ;
Journal of the Korean Society of Visualization, volume 12, issue 1, 2014, Pages 25~29
DOI : 10.5407/JKSV.2014.12.1.025
The outlet flow of the centrifugal blower were quantitatively visualized using particle image velocimetry. Because the centrifugal blower is one of the key parts of electric vehicle battery cooling system, the quantitative information of centrifugal blower is necessary to design and optimize the cooling system. The effect of different inlet flow condition to the outlet flow was investigated in this study. Two different inlet ducts were used. One is the straight inlet and the other is a bended one. The results clearly showed the outlet flow asymmetry in both inlet ducts. When the blower has the bended inlet, the flow rate decreases due to the increase of the head loss.
Orifice shape effect of the TLCD system under a low frequency
Lim, HeeChang ;
Journal of the Korean Society of Visualization, volume 12, issue 1, 2014, Pages 30~34
DOI : 10.5407/JKSV.2014.12.1.030
Bluff bodies under the external periodic force vibrate at their own natural or forced frequency. Rectangular bodies or similar structures such as high-rise towers and apartments, and recently a well-cited application - offshore floating bodies, usually needs to reduce these vibrations for stability and the mode control. Therefore, this study is aiming to reduce or control the vibration of a structure by a passive control method, i.e., TLCD (Tuned Liquid Column Damper). Controlling a moving body with a TLCD based on a variety of the orifice shape has been preliminary studied. In order to get a proper control, an optimized study is made on the design of the orifice shape, which has internal plates with the holes. The results show the force acting on the body due to the periodic movement highly depends on the number of holes on the plate and the height of the water level. Therefore, the optimum shape of the orifice and the height of the water level should be confirmed by a series of experiments.
Validation of Magnetic Resonance Velocimetry by Turbulent Pipe Flow
Lee, Jeesoo ; Song, Simon ; Cho, Jee-Hyun ;
Journal of the Korean Society of Visualization, volume 12, issue 1, 2014, Pages 35~42
DOI : 10.5407/JKSV.2014.12.1.035
Magnetic resonance velocimetry (MRV) is a versatile flow visualization technique using magnetic resonance imaging machine developed for the medical purpose. Recently, MRV is often utilized to analyze engineering flows due to its superior features of MRV such as capabilities of measuring flows with complicated, opaque flow geometry unlike optical techniques, 3-dimensional volumetric velocity vectors within a few hours, and etc. The purpose of this study was to validate the MRV data and evaluate the accuracy of the mean velocity profiles that we acquired for a turbulent flow in a circular pipe using a MR machine installed in Korea Basic Science Institute, Ochang, Korea. In addition, we briefly describe a procedure of parameter optimization for the operation of MRV. The results indicate that the MRV measurements provided well resolved mean velocity fields with a quite reasonable accuracy according to the inner and outer layer scaling laws of the turbulent pipe flows.
Performance Evaluation of Rotational Flow of a 2×2 Microfluidic Centrifuge with varying Inlet Conditions and Chamber Sizes
Jeon, Hyeong Jin ; Kwon, Bong Hyun ; Kim, Dae Il ; Kim, Hyung Hoon ; Go, Jeung Sang ;
Journal of the Korean Society of Visualization, volume 12, issue 1, 2014, Pages 43~48
DOI : 10.5407/JKSV.2014.12.1.043
This paper describes the measurement of performance evaluation of rotational flow varying chamber size and Reynolds number. Through the experimental visualization of the flow rotation, the number and position of flow rotation in the
microfluidic centrifuge were examined. At a chamber width of 250
, single flow rotation was obtained over at a Reynolds number of 300, while at a chamber width of 500
, single flow rotation did not appear. For performance evaluation, the intensity in microchamber was measured during 20 sec. At a chamber width of 250
, performance of rotational flow increased as Reynolds number increased. However, the variation of intensity in microchamber remained unchanged at a chamber width of 500
. The numerical analysis showed that the threshold centrifugal acceleration to obtain rotational flow for ejected particles was 200g.
Synthesis of FDR-SPC Resin and PIV Measurement for Frictional Drag-reduction
Chung, Sungwoo ; Kim, Eunyoung ; Chun, Ho Hwan ; Park, Hyun ; Lee, Inwon ;
Journal of the Korean Society of Visualization, volume 12, issue 1, 2014, Pages 49~53
DOI : 10.5407/JKSV.2014.12.1.049
In this study, a novel FDR-SPC is first synthesized in this study. The drag reducing functional radical such as PEGMA (Poly(ethylene) glycol methacrylate) has been utilized to participate in the synthesis process of the SPC. The types of the baseline SPC monomers, the molecular weight and the mole fraction of PEGMA were varied in the synthesis process. The resulting SPCs were coated to the substrate plates for the subsequent hydrodynamic test for skin friction measurement. In a low-Reynolds number flow measurement using PIV (Particle Image Velocimeter), a significant reduction in Reynolds stress was observed in a range of specimen, with the maximum drag reduction being 15.9% relative to the smooth surface.