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일정 벽면 온도 조건에서 이성분 혼합물의 핵비등시 벽면 열유속 거동
배성원,이한춘,김무환,Bae, Sung-Won,Lee, Han-Choon,Kim, Moo-Hwan 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.9
The objective of this work is to measure space and time resolved wall heat fluxes during nucleate pool boiling of R113/R11 mixtures using a microscale heater array in conjunction with a high speed CCD. The microscale heater array is constructed using VLSI techniques, and consists of 96 serpentine platinum resistance heaters on a transparent quartz substrate. Electronic feedback circuits are used to keep the temperature of each heater at a specified temperature and the variation in heating power required to keep the temperature constant is measured. Heat flux data around an isolated bubble are obtained with triggered CCD images. CCD images are obtained at a rate of 1000frames/second. The heat transfer variation vs. time on the heaters directly around the nucleation site is plotted and correlated with images of the bubble obtainedby using the high speed CCD. For both of the mixture(R11/R113) and pure system(pure R11, pure R113), the wall heat fluxes are presented and compared to find out the qualitative difference between pure and binary mixture nucleate boiling.
이상돈(Sang Don Rhee),배성원(Sung Won Bae) 한국사회체육학회 2008 한국사회체육학회지 Vol.0 No.34
The purpose of this study was to apply a consumer decision-making model to specific shopping styles involving athletic apparel and to examine specific shopping pattern differences between selected university students. For this study, quantitative research was conducted to analyze the effect of seven factors: brand, quality, recreation, confusion, fashion, impulse, and price consciousness on a revised scale of Consumer Style Inventory(CSI), invented by Sproles and Kendall(1986), following a pilot study. For this study, there were 553 males and 288 female college students from a total of 841 samples, were usable data. In order to analyze three research questions for this study, frequency analysis, 2×4 MANOVA, ANOVA, and mean comparisons were performed to analyze specific-shopping pattern differences between selected university students. As a result, male and female college-aged consumers were different shopping patterns in relation to on quality and price consciousness according to Wilks` Lambda=0.936;F=8.084b, p=.000. However, there were no statistically significant differences among college classifications. Also, there were no interactions between gender and college classifications.
학생선수의 지각된 사회적 지지와 역할취득, 자아정체성, 학교생활적응 간의 가설적 인과모형
이혁기(Hyuck Gi Lee),배성원(Sung Won Bae),최정웅(Jeong Woong Choi) 한국사회체육학회 2011 한국사회체육학회지 Vol.0 No.44
The purpose of this study was to analyze the causal model among perceived social support, role taking, self-identity and school adjustment of a student-athlete. For this study, participants were 288 students-athletes from elementary, middle, high school, and colleges; convenience sampling was applied. AMOS 7.0 Program was performed to analyze the Structural Equation Model (SEM). As a result, the social support was a direct effect to the role taking. The role taking was directly influenced to the self-identity and school adjustment. Selfidentity was a direct effect to school adjustment. Finally, social support was indirectly influenced to self-identity and school adjustment.
Leidenfrost 지점 온도 이상에서 액적-벽면 충돌 열전달에 대한 충돌 속도의 영향
박준석(Jun-seok Park),김형대(Hyungdae Kim),배성원(Sung-won Bae),김경두(Kyung Doo Kim) 대한기계학회 2015 大韓機械學會論文集B Vol.39 No.7
Leidenfrost 온도 이상으로 가열된 벽면과 충돌하는 액적의 속도가 열전달 특성에 미치는 영향에 관한 실험 연구를 수행하였다. 동기화된 초고속 가시화 카메라와 적외선 카메라를 이용하여 벽면과 충돌하는 액적의 충돌 특성과 충돌면의 온도 분포를 측정하였다. 획득한 표면온도 분포를 충돌면의 경계조건으로 이용하여 가열 벽면의 3차원 비정상 열전도 수치해석을 통해 표면 열유속 분포를 얻었다. 수직방향 충돌속도가 증가할수록 최대 액막 직경이 증가하고 가열 벽면과 액막 사이에 존재하는 증기막의 두께가 감소하여 열전달 효율이 증가하였다. 액적은 웨버수가 30보다 작은 경우 되튐현상이 발생하였으며, 큰 경우 작은 액적들로 분쇄되어졌다. 충돌속도에 의한 열전달량의 증가 경향이 되튐영역에서 분쇄영역에서 가면서 약화되었으며, 이는 분쇄현상에 의해 유효 열전달 면적의 확대 효과가 저감되었기 때문으로 해석된다. Single droplet-wall collision heat transfer characteristics on a heated plate above Leidenfrost temperature were experimentally investigated considering the effects of impact velocity. The collision characteristics of the droplet impinged on the heated wall and the changes in temperature distribution were simultaneously measured using synchronized high-speed video and infrared cameras. The surface heat flux distribution was obtained by solving the three-dimensional transient heat conduction equation for the heated substrate using the measured surface temperature data as the boundary condition for the collision surface. As the normal impact velocity increased, heat transfer effectiveness increased because of an increase in the maximum spreading diameter and a decrease in the vapor film thickness between the droplet and heated wall. For We < 30, droplets stably rebounded from a heated wall without breakup. However, the droplets broke up into small droplets for We > 30. The tendency of the heat transfer to increase with increasing impact velocity was degraded by the transition from the rebounding region to the breakup region; this was resulted from the reduction in the effective heat transfer area enlargement due to the breakup phenomenon.