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液膜法에 의한 구리 및 코발트이온의 分離時 共存鹽의 影響
金柱奉,姜奉根,李成植,全成均 東亞大學校 大學院 1988 大學院論文集 Vol.13 No.-
The effect of co-existing salts on the extraction of copper ion with LIX65N and cobalt ion with PC88A in aqueous solution and the copper permeation through the supported liquid membrane with LIX65N has been studied. 1.The maximum extraction constant, K?? of copper ions was obtained when the mole ratio of LIX65N concentration versus the concentration of copper ions was 6-fold. 2.The over all extraction constant, k?? and distribution ratio, D were inceased linealy wiht increasing difference of final pH and initial pH in aqueous solution and were decreased with increasing concentration of co-existing anion salts. 3.The extraction of cobalt ion with PC88A-Toluene system, hydrogen ion concentration were increased wiht increasing of distribution ratio and D was increased linealy wiht increasing PC88A concentration. 4.The rate of copper permeation through the supported liquid membrane wiht LIX65N-Toluene system were increased with increasing of concentration of etractant and hydrogen ions between up-stream and down-stream solution. 5.The initial flux of copper ions was decreased wiht increasing concentration of co-existing salts both up-stream and down-stream solution.
박호일(Hoil Park),서주봉(Jubong Seo),홍성유(Sungyou Hong),강수영(Suyoung Kang),김장균(Janggyeun Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
A flow noise radiating from a compressor housing of a vehicle turbocharge was investigated. The noise was induced by a vortex around the intake area of the compressor wheels - a intake flow noise, realized to be largely affected by a combination of the shape of the compressor scroll and that of compressor wheels by tests. And, its frequency did not increase proportionally to the turbocharger speed, and was located around the range of 1.6㎑ and 1.8㎑ to the whole working area of the turbocharger. Some countermeasures were tried to reduce the noise - helmholtz resonators, the change of the diffuser, the smaller compressor scroll, and a groove around the intake area of the compressor wheels. The smaller compressor scroll could effectively reduced the noise, but was not adopted because of the deterioration of the compressor performance. For the noise reduction, the groove was chosen because it could sufficiently reduce the noise and maintain the performance.