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맹주양,정병률,손지환,채민경 순천향대학교 기초과학연구소 1997 순천향자연과학연구 논문집 Vol.3 No.2
The Most powerful tools in the snthetic organic chemists arsenal are organometallic compounds and metal mediated transformations. Organometallic reagent has its own characteristic chemo, regio, or strereoselectivity. We reported a general approch for highly reactive meatl powder by reducing metal salt in tetrahydrofuran solvents using lithium as reducing agents. The metal salt to reduced must be partially soluble in the solvent and reductions are carried out under an argon atomosphrer. The reductions are exothermic and generally are complete within a few hours. The reductions generated a Finely divided black powder. particle size analyses indicate a range og sizes from one to two microns to submicron range depending on the metal and, more importantly, on the method of preparation. It should be pointed out that particle size analyses as wellas surface area stuies have been done the metals that been collected, dried, and analysis. Scanning electron microscopy(SEM) photographs reveal a range frommaterial to polycrysalline metals.
金秉宙,池濟煥 弘益大學校 科學技術硏究所 2001 科學技術硏究論文集 Vol.12 No.-
In the present study, the operating conditions and performance characteristics of an air-cooled ammonia-water absorption system were investigated. The effects of ambient air temperature, gas temperature and the chilled water temperature on the system COP, refrigerating capacity and thermodynamic second-law efficiency were studied. As the ambient air temperature increased, COP, refrigerating capacity, and second-law efficiency were all decreased. As the gas temperature increased refrigerating capacity increased. However COP and second-law efficiency were decreased. An increase of the chilled water resulted in the increase of system COP and refrigerating capacity with the decrease of second-law efficiency.
金秉宙 弘益大學校 科學技術硏究所 1994 科學技術硏究論文集 Vol.5 No.-
Transient thermal-hydraulic characteristics of pressurizer is analysed by using K-FIX code, which is developed for the general application to the transient two-phase system. Numerical analysis is performed to study the transient nature of pressurizer with boundary conditions of insurge, outsurge and spray. Velocity field is investigated 2-dimensionally. By introducing the marker particles shape of main interface fluctuating due to the insurge flow is found to affect interfacial heat and mass transfer rate strongly and thus the pressurizer pressure variations. The reliability of present studies is verified by comparing the current results with experimental data and with the output of other commercially avaliable computational code.
金秉宙 弘益大學校 1989 弘大論叢 Vol.21 No.2
Vapor explosion is a physical phenomenon of rapid transfer of the thermal energy of molten material as it mixes with cold liquid. Meanwhile the coolant expands as high pressure vapor due to phase change, resulting in mechanical work to the surrounding. Vapor explosion is studied as one of the safety problems in steel and paper industries, and nuclear industry. Its mechanism was tentatively applied to the design of internal combustion engines. In the present studies, the whole process of small-scale signle droplet vapor explosion is modeled by considering the fluid flow and heat transfer aspects. The reliability of the model was examined by comparing its results with experimental observations. The purpose of the present study is to contribute to the basic understanding of vapor explosion and to the determination of initial and boundary conditions which could prevent vapor explosion.
휜이 있는 협소 사각 유로에서 암모니아-물 혼합물의 비등열전달
金秉宙 弘益大學校 科學技術硏究所 2005 科學技術硏究論文集 Vol.16 No.-
An experimental study on saturated flow boiling heat transfer and two-phase flow pressure gradients of ammonia-water mixture was performed in a vertical narrow rectangular channel with offset strip fin. Boiling heat transfer coefficients and two-phase pressure gradients in an electrically heated test section were measured in the range of quality 0-0.12, mass flux 18-45 kg/m2s, and heat flux 1.25-6.70 kW/m^(2). Local boiling heat transfer coefficients were determined as a function of thermodynamic vapor quality, mass flux, and heat flux. Two kinds of boiling regimes were observed in the channel with offset strip fin: a nucleate boiling region for low to moderate vapor qualities and a convective boiling region for high vapor qualities. Two-phase flow pressure gradients increased with the increase of heat flux, vapor quality and mass flux.
金秉宙,金廷憲 弘益大學校 科學技術硏究所 1997 科學技術硏究論文集 Vol.8 No.-
In the present study, experimental data on the boiling heat transfer coefficients have been collectd to construct data-base for the easy comparison and analysis of expermental conditions, characteristics of refrigerants used in the experiment, and the boiling heat transfer coefficient. Correlations published in the open literature for the boiling heat transfer coefficient of pure refrigerant in smooth tube were analyzed based on the data-base. New correlation has been developed and its reliability was confirmed. The results of the present study could be used in the development of correlation for the application to the practical phase change heat transfer process in a wide range.
金秉宙 弘益大學校 科學技術硏究所 1996 科學技術硏究論文集 Vol.7 No.1
In the present studies, fluidized-bed incineration plant, which has the capabilities of combustion and waste heat recovery, has been simulated. Incineration plant was composed of combustor, waste-heat recovery heat exchanger and post-processing unit. Their size and function were to be determined based on the combustor requirements. The model for each component were gathered to develope the computational program to simulate the characteristics of plant and numerical analysis on the basic parameters were performed. The diameter of fluidized bed were found to depend on the feedrate of waste, diameter of fluidization particles, water content of waste, and the temperature of bed. Heat comsumption rate for the combustion of waste varied as a function of water content of waste. The optimum water content for the FBC plant in the present work Heat comsumption rate for the combustion of waste varied as a function of water content of waste. The optimum water content for the FBC plant in the present work were found to be about 60 %.