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Low Dimensional Modeling of Turbulent Thermal Convection
Hung Mok Park 한국화학공학회 1996 화학공업과 기술 Vol.14 No.3
N/A The Karhunen-loeve decomposition is used to obtain a low dimensional model describing the dynamics of turhulent thermal convection in a finite box. The KarhunenLoeve decomposition is a procedure for decomposing a stochastic field in an optimal way such that the stochastic field can be represented with a minimum number of degree of freedom. Numerical data for the turbulent thermal convection, generated by a pseudo-spectral method for the case of Pr=0.72 and aspect ratio are processed by means of Karhunen-Loeve decomposition to yield a set of empirical eigenfunctions. A Galerkin procedure employing this set of empirical eigenfunctions reduces the Boussinesq equation to a small number of ordinary differential equations. This low dimensional model obtained from numerical data at the reference Rayleigh number of 70 times the critical Rayleigh number is found to predict turbulent convection reasonably well over a range of Rayleigh numbers around the reference value.
LOW DIMENSIONAL MODELING OF TURBULENT THERMAL CONVECTION
Park, Hung Mok 한국화학공학회 1996 Korean Journal of Chemical Engineering Vol.13 No.2
The Karhunen-Loeve decomposition is used to obtain a low dimensional model describing the dynamics of turbulent thermal convection in a finite box. The Karhunen-Loeve decomposition is a procedure for decomposing a stochastic field in an optimal way such that the stochastic field can be represented with a minimum number of degree of freedom. Numerical data for the turbulent thermal convection, generated by a pseudo-spectral method for the case of Pr=0.72 and aspect ratio=2, are processed by means of Karhunen-Loeve decomposition to yield a set of empirical eigenfunctions. A Galerkin procedure employing this set of empirical eigenfunctions reduces the Boussinesq equation to a small number of ordinary differential equations. This low dimensional model obtained from numerical data at the reference Rayleigh number of 70 times the critical Rayleigh number is found to predict turbulent convection reasonably well over a range of Rayleigh numbers around the reference value.
Low Dimensional Modeling of Turbulent Thermal Convection
Park, Hung Mok 한국화학공학회 1996 NICE Vol.14 No.3
The Karhunen-loeve decomposition is used to obtain a low dimensional model describing the dynamics of turhulent thermal convection in a finite box. The KarhunenLoeve decomposition is a procedure for decomposing a stochastic field in an optimal way such that the stochastic field can be represented with a minimum number of degree of freedom. Numerical data for the turbulent thermal convection, generated by a pseudo-spectral method for the case of Pr=0.72 and aspect ratio are processed by means of Karhunen-Loeve decomposition to yield a set of empirical eigenfunctions. A Galerkin procedure employing this set of empirical eigenfunctions reduces the Boussinesq equation to a small number of ordinary differential equations. This low dimensional model obtained from numerical data at the reference Rayleigh number of 70 times the critical Rayleigh number is found to predict turbulent convection reasonably well over a range of Rayleigh numbers around the reference value.
On Orbit Data Analysis About the Passive Cooling of MIRIS, a Compact Space Infrared Telescope
Duk-Hang Lee,Bongkon Moon,Woong-Seob Jeong,Jeonghyun Pyo,Chol Lee,Son-Goo Kim,Youngsik Park,Dae-Hee Lee,Sung-Joon Park,Il-Joong Kim,Won-Kee Park,Kwang-Il Seon,Uk-Won Nam,Sang-Mok Cha,Kwijong Park,Jang 한국천문학회 2014 天文學會報 Vol.39 No.1
Park, Jong-Pil,Song, Mi-Yeon,Jung, Won-Mok,Lee, Won-Young,Lee, Jin-Ho,Kim, Hang-Geun,Shim, Il-Wun Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.10
SnS thin films were deposited on glasses through metal organic chemical vapor deposition (MOCVD) method at relatively mild conditions, using bis(3-mercapto-1-propanethiolato) tin(II) precursor without toxic $H_2S$ gas. The MOCVD process was carried out in the temperature range of $300-400^{\circ}C$ and the average grain size in fabricated SnS films was about 500 nm. The optical band gap of the SnS film was about 1.3 eV which is in optimal range for harvesting solar radiation energy. The precursor and SnS films were characterized through infrared spectroscopy, nuclear magnetic resonance spectroscopy, DIP-EI mass spectroscopy, elemental analyses, thermal analysis, X-ray diffraction, and field emission scanning electron microscopic analyses.
Factors affecting waterproof efficiency of grouting in single rock fracture
Lee, Hang Bok,Oh, Tae-Min,Park, Eui-Seob,Lee, Jong-Won,Kim, Hyung-Mok Techno-Press 2017 Geomechanics & engineering Vol.12 No.5
Using a transparent fracture replica with aperture size and water-cement ratio (w/c), the factors affecting the penetration behavior of rock grouting were investigated through laboratory experiments. In addition, the waterproof efficiency was estimated by the reduction of water outflow through the fractures after the grout curing process. Penetration behavior shows that grout penetration patterns present similarly radial forms in all experimental cases; however, velocity of grout penetration showed clear differences according to the aperture sizes and water-cement ratio. It can be seen that the waterproof efficiency increased as the aperture size and w/c decreased. During grout injection or curing processes, air bubbles formed and bleeding occurred, both of which affected the waterproof ability of the grouting. These two phenomena can significantly prevent the successful performance of rock grouting in field-scale underground spaces, especially at deep depth conditions. Our research can provide a foundation for improving and optimizing the innovative techniques of rock grouting.