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급가감속 운전에 따른 듀얼 모노리스형 촉매변환기 내의 유동 균일도와 압력 강하에 관한 수치적 연구
김영득,정수진,김우승,Kim, Young-Deuk,Jeong, Soo-Jin,Kim, Woo-Seung 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.5
The conversion efficiency, durability and pressure drop of the automotive exhaust catalysts are dependent on the flow distribution within the substrate. Conventional porous medium approaches assuming monolith resistance based on the one-dimensional laminar flow for simulating the flow through the automotive exhaust catalysts over-predict the flow uniformity in the monolith. In this study, additional pressure loss is also considered by accounting for entrance effects due to the oblique flow incident on the front face of monolith as a consequence of flow separation and recirculation within the diffuser. The incorporation of an additional pressure loss improves the predictions for the maximum flow velocity within the substrate. An numerical study has also been conducted for the three-dimensional unsteady incompressible non-reacting flow inside various dual-monolith catalytic converters for the rapid acceleration/deceleration driving.
저온(低溫)가스 연돌의 보온이 연돌의 최적높이에 미치는 영향
김영득,민만기,Kim, Y.D.,Min, M.K. 대한설비공학회 1990 설비공학 논문집 Vol.2 No.3
This paper presents that in the Korean Ondol Heating System using hard coal as an usual fuel, what effects an insulation of chimney with the low temperature gas flow has on the optimum chimney height which gives a maximum gas weight flow rate under the general weather data and actual design condition of chimney is compared with the bared chimney and studied. And also, the effects of chimney materials and diameter, dimensionless temperature difference, insulating materials and thickness which have on the optimum chimney height were researched and a good results increasing a maximum gas weight flowrate is obtained by insulating the chimney.
관개용 저수지 농업용수의 국가 전과정 목록분석 데이터베이스 구축
김영득,박필주,Kim, Young-Deuk,Park, Pil-Ju 한국농공학회 2011 한국농공학회논문집 Vol.53 No.3
The objective of the study is to develop life cycle inventory (LCI) database of dam, a major facility for irrigation water supply. The types of database developed are three out of nine dams according to the size of the wate r storage capacity: two kinds larger than 500,000 $m^3$ depending on gate for discharging (Type 1) and the other dam smaller than 500,000 $m^3$ (Type 2). According to the LCI analysis, type 1 larger than 500,000 $m^3$ storage capacity with gate has the lowest environment impact in the 6 impact categories. The impact of the type 1 accounts for 7~35 % of the type 2 for supplying irrigation water. Comparing with the environment impacts of water for other uses such as drinking and industrial water, the impacts of 1 $m^3$ irrigation water supply is 4~45 % of the one for industrial water supply and 1~16 % of the drinking water's. The three types of LCI DB on the irrigation water by dams will be useful in the application of Life Cycle Assessment in agricultural products and environmental labelling including carbon footprint since it is complied to the guidelines of LCI DB constr uction issued by Ministry of Environment and Ministry of Knowledge Economy.
2차원(次元) 온돌 상난방(床煖房)시스템의 연도내 열유동(熱流動) 및 열전달(熱傳達) 수치해석(數値解析)
김영득,민만기,이상혁,김원갑,Kim, Y.D.,Min, M.K.,Lee, S.H.,Kim, W.K. 대한설비공학회 1994 설비공학 논문집 Vol.6 No.4
Numerical analysis was applied to a simplified two-dimensional Ondol heating model which consists of heating space on the top of it along with radiant and convective heating floor panel, flue channel in the midway and rectangular underground soil region at the bottom. These three components constitute a system thermally coupled at the top and bottom interfaces of the flue channel. Investigated in the present paper are effects with variations of the Reynolds numbers of 100, 200, and 300, Grashof numbers of $0.1{\times}10^6$ and $0.3{\times}10^6$ and aspect ratios of 15 and 20 on the heat transfer and fluid flow characteristics of two-dimensional Ondol heating model by computer simulation.
간접 가열방식의 연속식 열처리로내 판(Plate)의 전열해석
김영득(Young-Deuk Kim),강덕홍(Deok-Hong Kang),김기홍(Ki-Hong Kim),김우승(Woo-Seung Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
In this study, numerical simulation has been performed by considering the convective and radiative heat transfer to predict the transient thermal behavior of the plate in indirectly-fired continuous heat treatment furnace. The temperature profiles in the plate are determined using transient one-dimensional heat conduction equation. To verify the validity of the present numerical results, the present results obtained from the transient analysis are compared with those of experiments. Extensive parametric investigations are performed to examine the effects of the emissivities of the plate and refractory, charging temperature and residence time of the plate as well as gas temperature of the work side and drive side in a heat treatment furnace, on the thermal behavior of the plate.
간접 가열방식의 연속식 열처리로내 판(Plate) 온도해석에 관한 연구
김영득(Young-Deuk Kim),강덕홍(Deok-Hong Kang),김기홍(Ki-Hong Kim),김우승(Woo-Seung Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
This study has been performed to predict the transient thermal behavior of the plate with the furnace geometry, material properties and operating conditions of the furnace as input parameters. The temperature profiles in the plate are determined using transient one-dimensional heat conduction equations. To verify the validity of the present numerical results, the present results obtained from the transient analysis are compared with those of experiments. Extensive parametric investigations are performed to examine the effects of plate and refractory emissivities, plate thickness and velocity, as well as change in gas temperature, on the thermal behavior of the plate.