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동상근(Sang Keun Dong),양제복(Jae Bok Yang),정우남(Woo Nam Jung) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
In the present study, compact Non O2 Anealing Furnace is proposed and Rx generator Which is used for non oxygen condition, is embedded inside furnace. Also Re-generative Single Radiant Tube Type Burner id developed for efficient heating burner. Experimental as well as numerical simulations are performed on a real scale model of Compact Full Time Re-generative Single Radiant Tube Type Burner. A comprehensive CFD model validated with experimental results is used to perform detailed numerical thermal analysis of the combustion process and complex heat transfer mechanism in heat exchangers built within the RT burner. Simulations are performed to investigate the effect of different input conditions on the performance of RT burner.
A study of Water flooding modeling for DMFC at cathode channel
동상근(Sang-Keun Dong),유기수(Kisoo Yoo),이대근(Dae-Keun Lee),정명균(Myung-Kyoon Chung) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The present paper addresses the water flooding model validation in cathode channel for DMFC. Water flooding not only reduces DMFC stack performance but also causes O₂ starve that damages membrane at cathode channel. Although the water flooding problem is critical in operating DMFC, it has not been resolved yet since the effect of temperature, H₂O vapor and liquid partial pressure effects on the H₂O vapor saturation is very complex. Therefore, the operating feasible range in the dynamic control of DMFC is inevitably narrow. In order to be able to dynamically control the DMFC to prevent water flooding problem at cathode channel, 3D numerical model was validated by comparison with experimental result. We performed numerical simulation for a wide range of V<SUB>cell</SUB> - current density for 1 layer-1 cell DMFC and the results were compared with experimental data. It was found that the 3D simulation model for the DMFC can be used to accurately predict the water flooding at cathode channel.
메탈화이버 연소기를 이용한 수증기 개질반응기에 대한 수치해석 연구
홍성국(Sung Kook Hong),동상근(Sang Keun Dong) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The numerical investigation is performed to gain the insight for optimal design of 300 Nm<SUP>3</SUP>/hr steam reforming reactor. It is assumed that three metal fiber burners are installed in the reactor with the 20 reforming tubes for delivering the required reaction heat. In this study, the design parameters of metal fiber burner are considered such as the secondary air flow rate and the input heat. The commercial program is utilized for the heat and flow calculation which are coupled with steam reforming reaction. Through numerical calculation, the characteristics on reforming rector are evaluated according to various design parameters. It is found that the temperature distributions in the reactor and the amount of produced reforming gases significantly varied depending on the secondary air flow rate of metal fiber burner.
한 쌍의 2차원 반무한 사각전극이 유전성 유체에 작용하는 전기유체역학적 힘
이대근(Dae Keun Lee),최경빈(Kyong Bin Choi),동상근(Sang-Keun Dong),고창복(Chang-Bok Ko),정정열(Jung-Yeul Jung) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
When a couple of 2-dimensional, semi-infinite and rectangular electrodes is placed in a dielectric fluid and voltages applied to them are different, the electrohydrodynamic force acting on a dielectric fluid is analytically obtained. Since the physical domain is symmetric on the centerline and the applied potentials are anti-symmetric based on the mean value, the analysis on the half physical domain suffices for our purpose. The half domain can be conformally transformed to the infinite strip, where the Laplace equation on the electrical potential can be easily solved. When the results are applied to a micropump design, it can provide the body-force field and the hydrostatic pressure difference and help the optimal design of electrodes.