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구형 입자를 현탁시킨 이중관 기포탑에서의 기 - 액간 물질전달
최일곤(Il Gon Choi),백진호(Jin Ho Paek),한승완(Seung Wan Han),김상렬(Sang Yeul Kim) 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.2
The effects of gas velocity, the concentration and size of particle, and diameter of draught tube on the gas holdup and the volumetric liquid phase mass transfer coefficient in a urea resin-particle-suspended bubble column were studied experimentally. ε_G and K_La were decreased with increasing the concentration and size of particle and based on these observations, correlation equation for gas holdup and volumetric liquid phase mass transfer coefficient was obtained through a regression analysis of experimental data. (수식)
한승완,최일곤,윤영웅,김상렬 ( Seung Wan Han,Il Gon Choi,Young Woung Yun,Sang Yeul Kim ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.5
The gas holdup ε_g and volumetric liquid-phase mass transfer coefficient K_La in a bubble column with a draught tube were studied experimentally with variation of the concentration of CMC solutions, gas velocity and diameter and height of the draught tube. The gas holdup ε_g increased with decreasing concentration of CMC solutions and increasing the diameter ratio of the draught tube to column diameter but was not affected by H/H_7. The volumetric liquid-phase mass transfer coefficient K_La decreased with increasing concentration of CMC solutions and the height ratio of the draught tube to column height but was not affected by the diameter ratio of the draught tube to column diameter. Dimensionless equations of the gas holdup ε_g and the volumetric liquid-phase mass transfer coefficient K_La were proposed from the experimental results.
공정시스템, 이동현상, 화학공정안전 : 건조 공정 중 요소 수지 성형재료의 경화 특성에대한 물질전다 효과
김상렬 ( Sang Yeul Kim ),최일곤 ( Il Gon Choi ),김병철 ( Byoung Chul Kim ) 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.6
In the industrial field, the theory of drying process is different from the practical application, and it is effective to reduce energy by recirculation of the heat of exhausting gas. But the study of this field may not be performed still. The cure properties of the urea resin moulding compounds was investigated according to drying temperature, drying time, recycle rate of exhausting gas and moulding temperature in the process of drying and moulding. We obtained the following results; water content of material decreases with increasing drying time and drying temperature, and the rate of drying also decreases with increasing recycle rate of exhausting gas. Specially, The cure fluidity of the urea resin moulding compounds decreases, with increasing drying temperature, recycle rate of exhausting gas and moulding temperature. And the correlation equations on water content and cure fluidity of the urea resin moulding material were obtained through a regression analysis of experimental data.