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2차원 관내 유동에서 불활성 기체 제거과정의 직접 수치 해석
신승원(S. Shin) 한국전산유체공학회 2007 한국전산유체공학회지 Vol.12 No.3
Dynamic behavior of immiscible gas bubble attached to the wall in channel flow plays very important role in many engineering applications. Special attention has been paid to micro direct methanol fuel cell(μDMFC) where surface tension becomes dominant factor with minor gravitational effect due to its reduced size. Therefore, displacement of CO₂ bubble generating on a cathode side in μDMFC can be very difficult and efficient removal of CO₂ bubbles will affect the overall machine performance considerably. We have focused our efforts on studying the dynamic behavior of immiscible bubble attached to the one side of the wall on 2D rectangular channel subject to external shear flow. We used Level Contour Reconstruction Method(LCRM) which is the simplified version of front tracking method to track the bubble interface motion. Effects of Reynolds number, Weber number, advancing/receding contact angle and property ratio on bubble detachment characteristic has been numerically identified.
국립중앙도서관 소장 〈왕회도(王會圖)〉 병풍의 제작 시기 추정 - 정전(正殿) ~ 상월대를 향한 계단 위 인물들의 복식과 의물 도상 분석을 중심으로-
이민정(Lee Min-Jung),이경미(Lee Kyung-Mee) 한복문화학회 2021 韓服文化 Vol.24 No.1
Wanghoedo (Envoys Paying Tribute to the Court) is an illustration of envoys from various countries paying tribute to an emperor originated from an anecdotes of legendary Chinese emperors receiving foreign envoys. It is known to have first painted at the request of An Sa-Go under the auspices of Emperor Taejong of Tang. In China, Wanghoedo was continuously painted from Ming to Qing Dynasty. In Joseon, Wanghoedo was established as one of subjects for the royal folding screens during the era of King Jeongjo and Sunjo and had developed into various forms. Yet, the exact time of the production of the remaining individual screens has not been determined. The purpose of this paper is to estimate the timing of the production of Wanghoedo titled "Jinasashin Joseonguk Ahyun Hoedobyung" housed in the National Library of Korea (NLK Wanghoedo), which was estimated to have been produced during the Korean Empire but has not been proven clearly, by analyzing the costumes worn on the figures in the painting. To this end, it was compared and analyzed with other Wanghoedo screens that remain and paintings with significant link. In NLK Wanghoedo, unlike other Korean Wanghoedo, envoys from Wolsang family tributing a white pheasant was depicted as a Qing envoy, Western envoys arrived right in front of the emperor"s podium, a number of royal guards was increased in double, and ritual objects were exalted to the imperial level. The costumes worn on the figures reflected the rapidly changing diplomatic conditions during the Korean Empire. In addition, the presence of the red green-plum blossoms on the back of a pine tree and a bizarre rock, use of cobalt pigment, and reduced body proportions of the figures helped to assume the artifact dates from the time of the Korean Empire.
Eulerian-Granular method를 사용한 고체 입자 유동 모델 개발
이태규(T. G. Lee),신승원(S. W. Shin) 한국전산유체공학회 2015 한국전산유체공학회지 Vol.20 No.2
In this paper, we have developed numerical model for particulated flow through narrow slit using Eulerian-Granular method. Commercial software (FLUENT) was utilized as simulation tool and main focus was to identify the effect from various numerical options for modeling of solid particles as continuos phase in granular flow. Gidaspow model was chosen as basic model for solid viscosity and drag model. And lun-et-al model was used as solid pressure and radial distribution model, respectively. Several other model options in FLUENT were tested considering the cross related effect. Mass flow rate of the particulate through the slit was measured to compare. Due to the high volume density of the stacked particulates above the slit, effect from various numerical options were not significant. The numerical results from basic model were also compared with experimental results and showed very good agreement. The effects from the characteristics of particles such as diameter, angle of internal friction, and collision coefficient were also analyzed for future design of velocity resistance layer in solar thermal absorber. Angle of internal friction was found to be the dominat variable for the particle mass flow rate considerably. More defined 3D model along with energy equation for complete solar thermal absorber design is currently underway.