1N-NaOH 수용액에 미세한 침상형 α-Goethite(평균길이 0.27㎛)가 현탁된 기포탑에서 물질전달 현상에 대하여 연구하였다. 기포경을 측정하기 위하여 2-point probe를 사용하였다. 측정된 기포경은 log-normal분포를 나타냈으며 공탑속도와 현탁농도의 증가에 따라 기포경의 분포는 unimodal 에서 multimodal로 변화되었다. 계산된 Sauter 평균 기포경(d_vs,volume-to-surface mean bubble diameter)은 공탑속도와 현탁농도의 증가에 따라 최소치를 보인후 증가하는 경향을 보였다. 물질전달계수(k_L)는 0.9wt% 미만에서 증가현상을 보였으며 0.9wt%이상일 경우 고체농도의 증가에 따라 급격히 감소하였고, 또한 Sauter 평균 기포경(d_vs)이 커짐에 따라 증가현상을 보였다. 본 현탁기포탑에서의 물질전달계수는 아래와 같이 무차원군과 고체농도비(wt%)의 항으로 잘 나타낼 수 있었다.
Sh=1.0×10^-5Sc^1.53Re^0.79Bo^0.51/(1+8.×Φ^2..73)

Mass transfer phenomena were studied in a slurry bubble column in which fine acicular α-Goe-thite partiicles(average length 0.27㎛) were suspended in 1N-NaOH solution. In order to measure bubble diameter, two-point probe was used. Distribution of measured bubble diameters in the slurry bubble column was showed log-normal and changed from unimodal to multimodal with increasing the superfiicial gas velocity and solid concentration. Sauter mean bubble diameter(d_vs, volume-to-surface mean bubble diameter)was minimized at transition region, but above that region, it was increased by increasing superficial gas velocity and solid concentrations. Liquid side mass transfer coefficient(k_L) was increased below 0.9wt% solid concen-tration but was suddenly decreased above 0.9wt% by concentrationg the solid. The k_L was also increased with increasing the Sauter mean bubble diameter. Liquid side mass transfer confficient can be represented as following equation by dimensionless groups and wt% concentration on this system and conditions.
Sh=1.0×10^-5Sc^1.53Re^0.79Bo^0.51/(1+8.×Φ^2.73)

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