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이경용(Kyoung-Yong Lee),최영석(Young-Seok Choi),김영률(Young-Lyul Kim),윤재호(Jae-Ho Yun) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
The axial fans for cooling condenser were designed by inverse design code TURBOdesign-1. The parameters of the inverse design were set by DOE(design of experiments). By changing the design parameters, such as the distribution of the blade loading, the spanwise circulation distribution and the stacking, 32 different fan designs were created. The overall performances and the local flow fields of these fans were computed by using a commercial CFD code. The results of the CFDcomputations were analyzed by DOE. The pressure rise and the efficiency were selected as the main responses and the main effects of the design parameters onthe responses were discussed. These procedures give a good way for the screening the parameters and the optimum design.
최선묵(Sun-Muk Choi),손창효(Chang-Hyo Son),이동건(Dong-Gun Lee),김영률(Young-Lyul Kim),오후규(Hoo-Kyu Oh) 한국마린엔지니어링학회 2004 한국마린엔지니어링학회 학술대회 논문집 Vol.2004 No.-
The evaporative heat transfer characteristics of carbon dioxide in a horizontal tube investigated experimentally. The experiments were conducted without oil in a closed refrigerant loop which driven by a magnetic gear pump. The main components of the experimental facility are a magnetic gear pump, a receiver, a mass flow meter, a pre-heater and evaporator(test section). The test section is a stainless steel tube of 7.75mm in I.D. and 5000mm in length, which was heated by an electric coil heating method. The experiment were conducted at mass flux of 200 to 400kg/㎡s, saturation temperature of -5℃ to 5℃, and heat flux of 10 to 30kW/㎡. The test result presents the evaporative heat transfer coefficient of carbon dioxide decreases as vapor quality increases. For all the experimental conditions, the heat transfer coefficient of carbon dioxide has an effect on more heat flux than mass flux. In comparison with test results, existing correlations failed to predict the evaporative heat transfer coefficient of carbon dioxide, therefore, it is necessary to develope reliable and accurate methods determining the evaporative heat transfer coefficient of CO₂ in a horizontal tube.