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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 2, Issue 2 - Dec 2004
Volume 2, Issue 1 - Aug 2004
Selecting the target year
Environmentally Friendly Industrial Combustion Technologies
Noh Dongsoon ;
Journal of the Korean Society of Visualization, volume 2, issue 1, 2004, Pages 3~7
Two novel industrial combustion technologies are introduced. High temperature air regenerative combustion for industrial heating system and oxyfuel combustion for power plant are considered as a energy saving and
emission reducing combustion technology. Research works are necessary to understand fundamental phenomena and to develope application technologies to industrial sector.
Conditional Sampling Measurement to Identify Flame Structures in Turbulent Combustion
Huh Kang Y. ;
Journal of the Korean Society of Visualization, volume 2, issue 1, 2004, Pages 8~11
Conditional sampling measurement is required for conditional averages as well as unconditional Favre averages to resolve different flame structures of turbulent combustion. A Favre average can be obtained as an integral of conditional average and Favre PDF in terms of the mixture fraction, which is a preferred choice as a sampling variable in diffusion controlled turbulent combustion. MILD combustion data are presented as an example for a conditionally averaged data set and comparison with CMC calculation results.
Study of Incipient Soot Particles with Measuring Methodologies
Lee Eui Ju ;
Journal of the Korean Society of Visualization, volume 2, issue 1, 2004, Pages 12~17
The physical characteristics of soot near the soot inception point were investigated with various measurements. In-situ measurements of particle size and volume fraction were introduced based on time resolved laser-induced incandescence (TIRE-LII) and laser-induced ion mobility (LIIM). The one has more convenience and accuracy than conventional LII technique and the other works best for particle sizes of a few nanometers at high concentrations in a uniform concentration field. A complementary ex-situ measurement of particle size is nano differential mobility analyzer (Nano-DMA), which recently developed for measuring particle sizes between 2nm and 100nm and provides high-resolution size information for early soot. Particles will be also collected on transmission electron microscope (TEM) grids using rapid thermophoretic sampling and analyzed for morphology. These measurements will allow fresh and original insight into the characterizing soot inception process. The measured physical properties of incipient soot will clarify the controlling growth mechanism combined with chemical ones, and the dominant mechanism for soot modeling can be deduced from the information.
Forum for Quantitative Flow Visualizations
Journal of the Korean Society of Visualization, volume 2, issue 1, 2004, Pages 18~20
유동제어 연구실 소개
Journal of the Korean Society of Visualization, volume 2, issue 1, 2004, Pages 21~24
Droplet size measurement using image processing method
Lim Byoungjik ; Jung Kihoon ; Khil Taeock ; Yoon Youngbin ;
Journal of the Korean Society of Visualization, volume 2, issue 1, 2004, Pages 25~31
Droplet size is one of the most important parameter which controls the performance of the combustion system using liquid fuel or oxidizer. Droplet formation and its size are mainly affected by the injection velocity and ambient gas density. Recently, droplet size measurement was conducted by PDPA or Malvern particle analyzer using laser light. But at this paper image processing method was developed to measure droplet size. And its validation was investigated with reticle.
Simultaneous Measurements of Velocity Fields at Two Vertically Crossing Planes by PIV Systems Using Polarization Technique
Kwon S. H. ; Yoon S. Y, ; Kim K. C. ;
Journal of the Korean Society of Visualization, volume 2, issue 1, 2004, Pages 32~38
A new PIV technique was developed for decreasing optical error which was created during simultaneous measurements of velocity fields at a wall-normal plane and wall-parallel plane by a plane PIV and a Stereo-PIV systems. For experimental study, two different Reynolds number based on momentum thickness, Re
=514 and 934 were generated in a blowing type wind tunnel under the condition of zero pressure gradient. The two Nd:Yag laser systems and three CCD cameras were synchronized. to obtain instantaneous velocity fields at the same time. To avoid optical noise at the crossing line by the two laser light sheets, a new optical arrangement using polarization was applied. The obtained velocity fields show the existence of hairpin packet structure vividly and the idealized hairpin vortex signature is confirmed by experiment.
Time-Resolved Two-Phase PIV Measurements of Freely Rising Bubble Flows with an Image Separation Method
Sung Jaeyong ; Park Sang Min ; Yoo Jung Yul ;
Journal of the Korean Society of Visualization, volume 2, issue 1, 2004, Pages 39~45
A time-resolved two-phase PIV system using a single camera has been developed, which introduces a method of image separation into respective phase images, and is applied to freely rising single bubble. Gas bubble, tracer particle and background have different gray intensity ranges on the same image frame when reflection and dispersion in the phase interface are intrinsically eliminated by optical filters and fluorescent particles. Further, the signals of the two phases do not interfere with each other. Gas phase velocities are obtained from the separated bubble image by applying the two-frame PTV. On the other hand, liquid phase velocities are obtained from the tracer particle image by applying the cross-correlation algorithm. As a result, the bubble rises rectilinearly just after it is released from an injector and then has a zigzag motion in the far field. From the trajectory of the bubble, it is found that the period of the zigzag motion is closely related to the vortex shedding although the wavelength of it varies along its movement.
The Numerical Study of Flow through Complicated-Channel with the Lattice Boltzmann Equation Method
Jeong Gl-Ho ; Ha Man-Young ;
Journal of the Korean Society of Visualization, volume 2, issue 1, 2004, Pages 46~51
This paper deals with the evaluation of several boundary conditions which are commonly used in the lattice Boltzmann equation method. 2-D channel flow(Poiseuille flow) and lid-driven cavity flow was selected as a test problem of this study, because there exist an analytic solution and previous study which could be used for a benchmarking test. It was found that lattice Boltzmann method still needs more considerations of stability and physical consistency, though it could predict the flow patterns both qualitatively and quantitatively.
Visualization of Combustion by Using Laser Diagnostic Techniques
Chung S. H. ; Won S. H. ;
Journal of the Korean Society of Visualization, volume 2, issue 1, 2004, Pages 52~56
Several visualization techniques of laser diagnostics are presented for combustion phenomena, including Mie scattering for flow, Rayleigh and Raman scattering spectroscopy for major species, laser-induced fluorescence for minor species, and laser-induced incandescence for soot. These techniques have been applied to understand the various combustion phenomena more clearly, including buoyancy-dominant flow system, diffusion flam oscillation, laminar and turbulent lifted flames, flame propagation along a vortex ring, and soot zone characteristics. The usefulness of laser diagnostics on a better understanding of physical mechanism is demonstrated.