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김홍건(H. G. Kim),고범용(B. Y. Go),강영우(Y. W. Kang),박명모(M. M. Park) 한국생산제조학회 2005 한국공작기계학회 추계학술대회논문집 Vol.2005 No.-
This study did the grinding processing of a carbon-ceramic disc and found out the processing characteristic. The grinding processing used the diamond resin wheel and processed. A wear of the diamond wheel and Load are big but are the stability relatively. The width of the change of a surface roughness is small. Therefore Grinding characteristics got good result.
연료전지 전극(Cathode)의 성능해석 및 설계에 관한 연구
김홍건(H. G. Kim),강성수(S. S. Kang),곽이구(L. K. Kwac),송하영(H. Y. Song),강영우(Y. W. Kang) 한국생산제조학회 2007 한국생산제조학회지 Vol.16 No.1
The cathode design is one of the most important parts in order to enhance the performance of fuel cells. A 3-D model of the porous oxygen reducing cathode with perforated current collectors is analysed for the enhanced design in fuel cells. Simulation is performed using equations of electric potential balance, momentum balance, and mass balance. The gas concentrations are quite large and are significantly affected by the reactions that take place. The weight fraction of oxygen, velocity field for the gas phase, and local overvoltage are illustrated in the porous reactive cathode layer. The current density is also analysed and the result shows the distribution and variation are stated in a wide range. It is found that the rate of reaction and the current production is higher beneath the orifice, and decreases as the distance to the gas inlet increases. The significance of the results is discussed in the viewpoint of the mass transportation phenomena, which is inferred that the mass transport of reactants dictates the efficiency of the electrode in this design and at these conditions.