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TAEJOO KIM,김종록,CHEULMUU SIM,SUNGHO LEE,YOUNGJIN SON,MOOHWAN KIM 한국원자력학회 2009 Nuclear Engineering and Technology Vol.41 No.1
In this investigation, we prepared a 1 and 3-parallel serpentine single PEMFC, which has an active area of 100 cm2 and a flow channel cross section of 1x1mm. Distribution and transport of water in a non-operating PEMFC were observed by varying flow types and the flow rates (250, 400, and 850 cc/min). This investigation was performed at the neutron imaging facility at the COld Neutron RAdiography facility (CONRAD), HMI, Germany of which the collimation ratio and neutron fluence rate are 250, 1 106 n/s/cm2, respectively. The neutron image was continuously recorded by a scintillator and lens- CCD coupled detector system every 10 seconds. It has been observed that although the distilled water was supplied into the cathode channel only, the neutron image showed a water movement from the cathode to the anode channel. The water at the cathode channel was completely discharged as soon as the pressurized air was supplied. But the water at the anode channel was not easily removed by the pressurized air except for the 3-parallel serpentine type with 850 cc/min of air flow rate. Moreover, the water at the MEA wasn’t removed for any of the cases.
중성자 영상법을 이용한 PEMFC에서 유동 방향과 차압에 따른 성능 및 물 분포에 관한 실험적 연구
김태주(TaeJoo Kim),김종록(Jongrok Kim),심철무(CheulMuu Sim),김무환(MooHwan Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In this investigation, we prepared a 3-parallel serpentine single PEMFC which has the active area of 25㎠ and the flow channel cross section of 1×1㎜. Distribution and transport of water in an operating PEMFC were observed by varying the flow directions (co-current and counter-current) in each channel and the differential pressures (100, 200, 300 ㎪) applied between the anode and cathode channels. This investigation was performed at the neutron imaging facility at the NIST. It has been observed that the differential pressure affects the performance of PEMFC while the flow direction affects spatial distribution of water when the neutron images were analyzed for several different operating conditions. More specifically, the amount of water production in the fuel cell increased as the partial pressure increases at a given current density and the water production was more uniform for the counter current than the co-current case. It is shown that the neutron imaging technique is a powerful tool to visualize the PEMFC.
하나로(HANARO) NRF 와 중성자 영상법을 이용한 PEM fuel cells 내의 물 배출 특성에 관한 연구
김태주(TaeJoo Kim),김종록(JongRok Kim),심철무(CheulMuu Sim),김무환(MooHwan Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
An investigation into the water discharge characteristics of PEM fuel cells is carried out by using a feasibility test apparatus and the Neutron Radiography Facility (NRF) at HANARO. The feasibility test apparatus was composed of a distilled water supply line, a compressed air supply line, heating systems and single PEM fuel cells which was a 1-parallel serpentine type with a 100 ㎠ active area. Three kinds of methods were used; compressed air supply only, heating only, and a combination of the methods of a compressed air supply and heating, respectively. The resultant water discharge characteristics are different according to the applied methods. The compressed air supply only is suitable for removing the water at a flow field and a heating only is suitable for water at the MEA. Therefore in order to remove all the water at PEM fuel cells, the combination method is needed at the moment.
중성자 영상법을 이용한 PEM Fuel Cell 내의 물 유동 및 분포 가시화
김태주(TaeJoo Kim),정용미(YongMi Jung),김무환(MooHwan Kim),M. Arif,심철무(CheulMuu Sim),이승욱(SeungWoo Lee),전진수(JinSu Jeon) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The neutron imaging technique was used to visualize the water movement and distribution at the actual operating PEM Fuel Cells. At this study, we changed the inlet humidity conditions (50 and 100 %) and output power to check the effect of water movement and distribution at the PEM Fuel Cell.
중성자 영상법을 이용한 PEMFC 에서의 물 배출 특성에 관한 실험적 연구
김태주(TaeJoo Kim),김종록(JongRok Kim),김무환(MooHwan Kim),심철무(CheulMuu Sim),이승욱(SeungWoo Lee),전진수(JinSoo Jeon) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The neutron imaging technique was used to investigate the water discharge characteristics at PEMFC. The feasibility test apparatus was consisted of pressurized air and water in order to simulate the actual operating PEMFC. The feasibility tests have been performed at two kinds of flow field type (1-parallel and 3-parallel) with 100 ㎠ active area and different flow rate (200, 400, and 850 ㏄/min). Although the water and pressurized air was supplied only into cathode, the water movement into anode was found by neutron image. The water at cathode is well discharged, but except the 850 ㏄/min at 3-parallel flow field type, the water at the anode was not removed by pressurized air. The total water volume variations at each condition were calculated from the neutron images. This technique can be used for detailed studies on water distribution and transport in the PEMFC.
Bo Kyung Cha,Jong Yul Kim,Tae Joo Kim,Yikyung Kim,Cheulmuu Sim,Seung Wook Lee,Gyuseong Cho IEEE 2010 IEEE transactions on nuclear science Vol.57 No.3
<P>Recent advances in of silicon-based CMOS (complementary metal-oxide-semiconductor) flat panel detectors have resulted in an attractive use of cost-effective radiation imaging devices for X-ray and neutron radiography/tomography system. Indirect detection methods consisted of an X-ray converter (or a scintillator screen) and photodiode arrays are more widely used in high resolution micro-CT (computed tomography), dental and industrial NDT applications. In this study, The terbium-doped gadolinium oxysulfide (Gd<SUB>2</SUB>O<SUB>2</SUB> S:Tb, Gadox) scintillator screens with different thickness (several 30-140 m thickness) were directly coupled with a fiber-optic plate (FOP) of a commercially available CMOS imaging device for high resolution X-ray and thermal neutron radiography. The RadEye1 CMOS APS (active pixel sensor) imager having a large active area of 25 × 50 mm<SUP>2</SUP> and 48 m pixel pitch was selected for X-ray and thermal neutron imaging with high resolution. The scintillation properties and imaging performance such as relative light output, linearity and spatial resolution were measured and evaluated under X-ray and thermal neutron beam exposure. The good linearity and high spatial resolution characteristics in X-ray and thermal neutron imaging experiments were achieved by using compact, cost-effective imaging detector with exchangeable Gadox scintillator screens.</P>
중성자속 및 선형 흡수 계수 보정을 고려한 중성자영상법을 이용한 PEMFC 내의 물 배출 특성에 관한 실험적 연구
김태주(TaeJoo Kim),김종록(JongRok Kim),김무환(MooHwan Kim),심철무(CheulMuu Sim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The neutron imaging technique was used to investigate the water discharge characteristics at PEMFC. Prior to investigation of water discharge characteristics, the linear attenuation coefficient for water at Neutron Radiography Facility (NRF) was calibrated. The feasibility test apparatus was consisted of pressurized air and water in order to simulate the actual operating PEMFC. The feasibility tests have been performed at 1-parallel serpentine type with 100 ㎠ active area and different air flow rate (1, 2, and 4 lpm). The total water volume variations at each condition were calculated from the neutron images. The water at channel is well discharged as soon as supplying the pressurized air into the PEMFC. However, because the water at MEA isn’t removed the total water volume is constant after 150. Therefore more effective method is needed in order to discharge water at MEA, and the neutron imaging technique is helpful for it.
중성자 방사선 촬영법을 이용한 PEMFC 내의 2 상 유동 가시화 예비 실험
김태주(TaeJoo Kim),정용미(YongMi Jung),김무환(MooHwan Kim),M.Arif(M. Arif),심철무(CheulMuu Sim),이승욱(SeungWoo Lee),전진수(JinSu Jeon) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
The feasibility test was performed to check the possibility of 2-phase flow visualization and water distribution at inside the PEMFC using neutron radiography image technique. It was composed using water and pressured air. From the image, several 2-phase flow patterns were discovered and water fraction was estimated by the reference specimen and image analysis.