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박희용,박신배 한국태양에너지학회 1985 한국태양에너지학회 논문집 Vol.5 No.1
In this study, heat transfer and flow characterics by laminar natural convection in a two dimensional partitioned enclosure were studied numerically. The enclosure was consisted of two vertical side walls, two partitions fixed to the ceiling and the floor and a long partition between the fixed partitions. It was assumed that the vertical side walls were isothermal and all the other surfaces were insulated. The governing equations for a fully buoyancy-driven-flow were solved by means of Elliptic SIMPLE finite difference method. Under steady condition, temperature, velocity, pressure and flow field were obtained at different sizes and locations of partitions over the range of Grashof numbers between 10⁴ and 10^7. As the result of this study, it was found that, increasing a long partition size, by enlarging its width. decreased the average heat transfer across the enclosure and the total heat transfer was reduced when the partitions were moved close to the side walls.
박희용,최종철,김종기,홍대형 대한건축학회 2006 대한건축학회논문집 Vol.22 No.1
The purpose of this study is to observe the Form and Spatial Role of Dang-Ga in Jeong-Jeon of Jo-Seon Dynasty‘s Royal Palace. Dang-Ga is a kind of Dat-Jip. And the Dat-Jip is originally changed and developed by the composition of Buddhist-shrine, Curtain structure and the Inside-wall. But Dang-Ga has the different form with Dat-Jip of the temple and has the different spatial structure which are iterative with 3 layer in the inside space of Jeong-Jeon, composing the centrality in the spatial use. Also the spatial composition of the Jeong-Jeon's front yard organize the central axis.
박희용,임경빈 대한기계학회 1987 대한기계학회논문집 Vol.11 No.2
The behaviors of layers developed in a solar pond were studied by experimental and analytical methods. An experimental solar pond heated from below was constructed and operated at the net heat fluxes of 110 and 160W/m$^{2}$ and at the initial salt concentration gradients of 18.2, 27.3 and 36.4%/m. The thicknesses, growth rates, temperature and salt concentration in the top and the bottom mixed layers, the diffusive layer and the upper and the lower interfacial boundary layers were measured. The shadowgraph technique was used in order to observe all layer formation and an electroconductivity-temperature probe consisting of four electrodes was fabricated and used in measuring the salt concentration. Based on the experimental results, a model for the solar pond was developed and the governing equation and the assumptions were established. The governing equations were solved by the numerical method. The calculated results obtained from the analysis were compared with the experimental results. 본 논문에서는 하부가열식 실험용 태양연못을 제작하여 열유속과 초기의 소금 농도구배를 변화시켜 가면서 실험을 수행하였다.실험을 통하여 측정한 각 층안의 온도와 소금농도구배 및 하부혼합층의 성장율 등을 바탕으로 지배방정식과 가정을 세 운뒤 이들 방정식을 풀어 실험테이터와 비교하였다.
3.5인치 Rocket용 Al - Cu - Mg- Mn합금의 주조 방안
朴喜鎔,崔守雄 陸軍士官學校 1974 한국군사학논집 Vol.12 No.-
This is an attempt to show how the material of the nozzle part of the 3.5inch rocket (Al-alloy : Al-Cu-Mg-Mn) was cast. That the casting resulted in the formation of blow holes was problematical. The solution : The casting was performed after mother alloys were made, since the difference in melting points of the composite elements resulted in blow holes and segregations. The pouring temperature, pouring velocity, method of pouring, and permeability of the mold were considered as factors in reducing the blow hole formation. The adequate conditions were found as follows : melting point 750℃ pouring temperature 700℃ pouring velocity 4cm/min pouring method top pouring permeability 40
박희용,이관수,김창기 대한기계학회 1990 대한기계학회논문집 Vol.14 No.5
본 연구에서는 원관내에서 동적으로 완전히 발달한 난류맥동유동에서 관벽에 서 균일한 열유속이 주어지는 경우에 대하여 난류모델로서 K-.epsilon. 2방정식 모델을 적용 하여 수학적인 모델을 세운 후 이를 수치적으로 해석하였다. 그 결과 시간평균 레이 놀즈수가 10000인 경우에 대하여 Strouhal수가 0.0005에서 0.05 그리고 맥동속도진폭 이 0.8이하인 맥동류에 대한 열전달 특성을 제시하였다. A numerical solution for heat transfer of pulsating turbulent pipe flow was presented under the condition of fully developed dynamic regime and uniform well heat flux. The k-.epsilon. turbulent model was adopted to describe turbulent characteristics. The results were given at following conditions ; Time-averaged Reynolds number equal to 10000 ; Strouhal number ranged from 0.0005 to 0.05 ; The peak velocity fluctuation varied from 20 to 80 percent of the mean velocity. It was found that the effect of pulsation on local heat transfer rate is greater at downstream than upstream and the heat transfer was increased or decreased according to the pulsating conditions.