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非定常流의 亂流領域에서 오리피스 形狀에 따른 損失 및 流量에 관한 實驗的 硏究
朴春根,徐利洙 東亞大學校 大學院 1984 大學院論文集 Vol.8 No.2
To loss and discharge coefficients of several types of orifices are studied experimentally for Reynolds numbers for 10⁴to 10?, and square-edged and sharp-edged orifices are varied thickness and angle of inclinations. experimental results, for thickness front direction of flow scarcely ever be varied loss and discharge coefficients, but back direction of flow are changed loss and discharge coefficients when angle of inclination are varied, for back direction of flow if angle of inclination be increased, loss coefficients be decreased and discharge coefficients be increased.
徐利洙 동아대학교 공과대학 부설 한국자원개발연구소 1982 硏究報告 Vol.6 No.1
It is presented outdoor design condition of air conditioning in Busan region with a view to ideal solution to the basic problem which confronts the designer of a air conditioning system. From weather data consideation following results are obtained. 1. it was drew-up one day change of dry-wet bulb temperature. 2. counting of air conditioning load and toal obtained heating quantity make use of table 3. 3. highest temperature distributed 25 percent on July and 75 percent on August, Highest dry-bulb temperature for one day concentrated in 72.5 percent at noon.
徐利洙 동아대학교 공과대학 부설 한국자원개발연구소 1985 硏究報告 Vol.9 No.2
Floor thickness and material conductivity and solar radiation are an important design parameter for heating system. Transient heat conduction through room floor was derived by response factor, as a function of floor thickness Thickness variation is influenced on the time lag of the temperature variation. Fuel comsumption is nearly independent of thickness and decreases with increasing the absorptivity and increases with increasing conductivity of wall.
徐利洙 동아대학교 공과대학 부설 한국자원개발연구소 1984 硏究報告 Vol.8 No.1
Though the decision of outdoor design temperature is a complicated problem in reality, thermal circumstances of outdoor temperature can be told to have periodic changes a great many variation. The hourly input of cooling can be calculated from the average of periodic outdoor temperature and humiditied, which may have irregular variation. This paper is to decide the most rational outdoor temperature for the most economic cooling design, through complling and analysing all records of Central Meteorogical Office and all data recorder in Busan comparing those reported standard outdoor temperature and humidities with each temperature. From weather data consideration following results are obtained. 1. It was drew-up change of dry-bulb temperature 2. The result of comparing the above variation value with each rated of risk 1%, 2.5%, 5% shows that the variation approximated to the risk rate of 5% of TAC temperature, the difference is within 0.7℃ and its average is 0.5℃ 3. The observatory statistic data for seven years revealed that highest temperature distributed 41.1% on July and 58.9% on August, highest temperature for one day concentrated 85% at P.M 3. temperature
장방형 밀폐공간내의 유체유동 및 전열특성에 관한 수치해석
서이수,유신오,전성모 東亞大學校 大學院 1997 大學院論文集 Vol.22 No.-
In this paper were investigated the numerical study of fluid flow in which the difference analysis connected the natural convection and mixed convection within enclosed condition. The cell boundaries arrangement for these calculations, uniformally divided as 44×44 when heated the bottom to muliply the length and height, and was in proportion 4 : 1 to the length and height when heated the left side to muliply 88×11. According to the repeat calculation of time division were obtained the temperature distribution, the velocity distribution, the isotherms distribution, & streamlines distribution in which the natural convection was altered Pr=0.71, Gr=10?. Gr=5×10?, Gr=10? and the mixed convection was changed as Pr=0.71, Re=100, Re=1000. For the numerical study on the heat transfer and fluid flow, the following consequence have calculated in proportion 4 : 1 to the length and hieght of rectangular enclosure with the number of Pr=0.71, the number of Re=100, 1000, the number of Gr=10?, 5×10?, 10?.
김도우,서이수 동아대학교 공과대학부설 생산기술연구소 1996 生産技術硏究所硏究論文集 Vol.1 No.2
It is of considerable interest to identify accurate prediction procedure for internal separated flows, since separation and reattachment generally have a significant effect on thermo-fluid performance in channel flow with abrupt expansion entrance. This analysis of numerical procedure is the prediction of the laminar flow and heat transfer in two dimensionanl, steady flow in asymmetric sudden expansion channel. The separation region and the reattachment point found was to be markedly dependent on Raynold numbers. The separation points moves down from the conjectured limit position at the sharp corner toward a Stokes flow limit as the Reynold number is decreased. For the three geometrical models the results of this numeracal analysis are in good agreement with the given experimetal studies, and the characteristics of the heat transfer in asymmetric sudden expansion chnnels accompanied by separted recirculating flow respectively are also obtained.