Browsing by Author "Lin, Tser-Sheng"

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Application of physical vapor deposition process to modify activated carbon fibers for ozone reduction
(2008-05-01)
Lin, Yu-Chih
;
Chang, Chung-Liang
;
Lin, Tser-Sheng
;
Bai, Hsunling
;
Yan, Ming-Gu
This study utilized the activated carbon fiber (ACF) modified with metal catalyst via physical vapor deposition (PVD) process (ACF/PVD) to diminish ozone. Furthermore, the ozone removal efficiency of ACF/PVD was compared with that of original ACF and ACF modified with metal catalyst via impregnation process (ACF/impregnation). In addition to the kinds of coated metal and the inlet ozone concentrations, the effects of the coating thickness and the reaction temperature on ACF/PVD for ozone removal were also examined. The results indicate that the ozone removal efficiency of ACF/PVD is better than that of original ACF and ACF/impregnation. The ozone removal efficiency of different metal-coated ACF/PVD in the superior order is gold (Au), and manganese (Mn). The increase of Au-coated thickness (3 nm to 80 nm) on ACF/PVD will enhance the ozone removal. However, when the Mn-coated thickness on ACF/PVD is larger than 15 rim, the ozone removal efficiency displays a declining trend. Furthermore, a higher reaction temperature will result in a better ozone removal of ACF/PVD and the original ACF.
Prediction of dimensionless cutsize for size-fractionated measurements of particles that impact on a sintered stainless-steel filter
(2007)
Huang, Cheng-Hsiung
;
Lin, Tser-Sheng
;
Chang, Sheh-Hsun
;
Tsai, Chuen-Jinn
;
環境工程研究所
This investigation experimentally studied the penetration curve of particles that impact on a sintered stainless-steel filter with various pore sizes, sampling flow rates and jet diameters. The penetration curves were compared to those with an aluminum foil substrate. Test data reveal that when the sintered stainless-steel filter has larger pore sizes (100 mu m or 40 mu m), the particle penetration, P(%), is lower and the curve is less steep than that obtained from the aluminum foil substrate. The penetration curve of the sintered stainless-steel filter with smaller pore size (5 mu m) is close to that of the aluminum foil substrate. The dimensionless cutsize-shift (the ratio of the dimensionless cutsize of sintered stainless-steel filter to that of aluminum foil) falls as the pore sizes and the Reynolds number increase. Experimental data were then compared with theoretical results, and theory over-predicted the dimensionless cutsize-shift. Hence, a regression equation for the dimensionless cutsize-shift is proposed by fitting the experimental data. The discrepancy between the experimental data and the regression prediction is within 4%. The regression equation can be used to predict the dimensionless cutsize for the size-fractionated measurements of particles that impact on a sintered stainless-steel filter with various sized pores and Reynolds numbers.