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RISS 인기검색어
- 검색키워드
- 저자 : Yang Hei-Cheon (검색결과 76 건)
- 무료
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양희천 여수대학교 2001 論文集 Vol.16 No.-
Fluid mixing is ubiquitous and essential in many natural and industrial systems. Understanding the mixing processes that occur in these diverse systems is essential for predicting many aspects of practical importance. The objective of this study is to perform the numerical investigation of flow and mixing in a spatially periodic continuous mixer using a finite enement method. The fully 3-dimensional velocity field for a partitioned pipe mixer under laminar flow conditions was obtained using commercially available CFD software. The simulated velocity field indicated that developing flows at the transitions between elements generated the greatest potential for mixing.
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비구성 격자계를 이용한 실린더 주위의 유동특성에 대한 수치적연구
양희천 麗水水産大學校産業技術硏究所 1998 産業基術硏究所 論文集 Vol.7 No.-
With the unstructured grid, this paper performed the numerical calculation for the unsteady, incompressible fluid flow around the circular cylinder, and compared with the result of the other analysis code. Finite volume method was used for the discretisation of governing equation, and PISO algorithm was applied to the velocity-pressure coupling problem. Discretised algebra equation were solved by CG method. The calculated result for the flow around the cylinder expected the time at which asymmetry occurs behind the cylinder and calculated presssure coefficient and skin friction showed good agreeement with that of theoretical result.
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양희천 麗水水産大學校産業技術硏究所 1997 産業基術硏究所 論文集 Vol.6 No.-
In this study external airflows around road vehicle models were numerically studied to investigate the aerodynamic characteristics. Models used in this study were simplified from the car which is runnung, and after understanding the physical meaning through numerical simulations for 2-D models, this was verified through numerical simulations for semi 3-D models amd 3-D model. FVM based on a general curvilinear coordinate system was used to solve the governing equations and for turbulent flows, standard k-εmodel were used. Two different differencing schemes e.g. Upwind Differencing Scheme and Linear Upwind Differencing Scheme were used and compared. There was large wake region behind vehicles, so the differencing scheme had an influence on the calculation results. The drag coefficients of 3-dimensional model car by the calculation were about 40-50% higher than the experimental values.
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Pressure Drop in Motionless Mixers
Yang, Hei-Cheon,Park, Sang-Kyoo The Korean Society of Mechanical Engineers 2004 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.18 No.3
A motionless mixer consists of a straight pipe or transfer tube containing the mixing elements that are used to cut, fold, twist, and re-combine the mixing fluid. The number of elements and their shape required in any application depend on the complexity of the mixing process. The objectives of this study are to develop new motionless mixers and to perform the experimental investigation of pressure drop in order to evaluate the performance of the new ones. Glycerin is used as a mixing fluid. Pressure drop is measured using a hydraulic manometer and correlations of friction factor are proposed as a function of Re. The friction factors of Sulzer SMX mixer are in qualitative good agreement with the published data. On the average, the friction factors of SSC and YNU mixers are about 36% lower than and 6% higher than that of the Sulzer one.
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Validation of a Spray Impingement Model
Yang, Hei-Cheon 여수대학교 산업기술지역개발연구소 2000 産業基術硏究所 論文集 Vol.9 No.-
에너지의 이용효율 향상 및 환경 오염 문제와 관련하여 최근에 들어서 연비 및 배기 규제를 만족하는 엔진개발을 위한 연구노력이 집중되고 있다. 디젤 분무와 벽의 충돌현상은 엔진의 성능과 배기에 영향을 미치는 중요한 영향요소중의 하나로 알려지고 있기 때문에 분무와 벽의 충돌현상에 대한 이해는 매우 중요하다. 본 연구에서는 분무의 벽면충돌과 충돌후의 액적 거동 모델의 적용성 검증을 위한 수치계산을 수행하여 실험결과와 비교하였다. 충돌 후 액적들의 반경방향 및 수직방향 도달거리, 접선방향의 속도, 2차 액적들의 SMD 등의 계산결과들은 정성적으로나 정량적으로 실험치와 잘 일치한다.
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Oxygen Transfer Characteristics of an Ejector Aeration System
Hei-Cheon Yang,Sang-Kyoo Park 한국유체기계학회 2012 International journal of fluid machinery and syste Vol.5 No.1
The objective of this study was to investigate the oxygen transfer characteristics of an ejector aeration system. In order to evaluate the oxygen transfer performance of the ejector aeration system, a comparative experiment was conducted on a conventional blower aeration system. The effect of entrained air flow rate and aerating water temperature on the oxygen transfer efficiency was investigated. The dissolved oxygen concentration increased with increasing entrained air flow rate, but decreased with increasing aerating water temperature for two aeration systems. The volumetric mass transfer coefficient increased with increasing entrained air flow rate and with increasing aerating water temperature for both aeration systems. The average mass transfer coefficient for the ejector aeration system was about 20% and 42% higher than that of the blower aeration system within the experimental range of entrained air flow rates and aerating water temperatures.
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Numerical Study of Impinging Diesel Sprays on a Wall
Yang, Hei-Cheon 여수대학교 산업기술지역개발연구소 2001 産業基術硏究所 論文集 Vol.10 No.-
본 연구에서는 액막 형성을 고려한 새로운 분무 충돌모델의 타당성을 검증하고, 연료의 비등온도 이하의 조건을 갖는 벽면에 충돌하는 비 증발분무의 특성을 수치적으로 해석하였다. 벽면 분무의 전체적인 구조에 대한 해석에서는 비교되는 다른 모델들에 비해서 향상된 예측 결과를 얻을 수 있었으며, 분무의 내부 구조에 대한 해석에서는 다른 모델들과는 달리 정체영역에서도 반사되는 액적들이 존재하는 결과를 얻을 수 있었다.
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Oxygen Transfer Characteristics of an Ejector Aeration System
Yang, Hei-Cheon,Park, Sang-Kyoo Korean Society for Fluid machinery 2012 International journal of fluid machinery and syste Vol.5 No.1
The objective of this study was to investigate the oxygen transfer characteristics of an ejector aeration system. In order to evaluate the oxygen transfer performance of the ejector aeration system, a comparative experiment was conducted on a conventional blower aeration system. The effect of entrained air flow rate and aerating water temperature on the oxygen transfer efficiency was investigated. The dissolved oxygen concentration increased with increasing entrained air flow rate, but decreased with increasing aerating water temperature for two aeration systems. The volumetric mass transfer coefficient increased with increasing entrained air flow rate and with increasing aerating water temperature for both aeration systems. The average mass transfer coefficient for the ejector aeration system was about 20% and 42% higher than that of the blower aeration system within the experimental range of entrained air flow rates and aerating water temperatures.
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Pressure Drop in Motionless Mixers
Hei Cheon Yang,Sang Kyoo Park 대한기계학회 2004 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.18 No.3
A motionless mixer consists of a straight pipe or transfer tube containing the mixing elements that are used to cut, fold, twist, and re-combine the mixing fluid. The number of elements and their shape required in any application depend on the complexity of the mixing process. The objectives of this study are to develop new motionless mixers and to perform the experimental investigation of pressure drop in order to evaluate the performance of the new ones. Glycerin is used as a mixing fluid. Pressure drop is measured using a hydraulic manometer and correlations of friction factor are proposed as a function of Re. The friction factors of Sulzer SMX mixer are in qualitative good agreement with the published data. On the average, the friction factors of SSC and YNU mixers are about 36% lower than and 6% higher than that of the Sulzer one.
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