非뉴톤 流體內에서 氣泡의 物質傳達

Abstract

非뉴톤 流體內에서 氣泡의 物質傳達係數와 抵抗係數를 測定하기 위하여 CMC水溶液에 대한 CO₂가스의 吸收實驗을 행하였다. 液塔內를 上昇하는 CO₂氣泡의 上昇速度와 부피變化를 高速 촬영기로 촬영하고, 이로부터 CO₂氣泡의 物質傳達係數와 抵抗係數를 計算하였다. CO₂氣泡의 物質傳達은 초기의 振動상태에서 및 氣泡의 形態가 變化하는 경우에 활발해 짐을 알 수 있었으며, 이러한 경향은 流體의 성질이 뉴톤流體에 가까울수록 현저한 경향을 나타냈다.

Mass transfer coefficients between the gas phase and the liquid phase, and the drag force coefficients of bubbles in non-Nelvtonian fluids were measured through the absorption CO₂gas bubbles in the CMC solution.

The rising rates, size changes of CO₂gas bubbles in the CMC solution column were recorded by using the high speed photography technique, and from these results instantaneous mass transfer coefficients and drag force coefficients were evaluated.

Mass transfer coefficients decreased rapidly with time during the early stage and slowly during the later stage of the bubble life.

It was found that tendencies of mass tranfer were increased when rising bur)1)toes oscillated and its shape was changed.

The calculated drag force coefficients turned out to be in good agreements with the relations of Sherwood number and Peclet number, applied to power-law model.

Mass transfer coefficients between the gas phase and the liquid phase, and the drag force coefficients of bubbles in non-Nelvtonian fluids were measured through the absorption CO₂gas bubbles in the CMC solution.

The rising rates, size changes of CO₂gas bubbles in the CMC solution column were recorded by using the high speed photography technique, and from these results instantaneous mass transfer coefficients and drag force coefficients were evaluated.

Mass transfer coefficients decreased rapidly with time during the early stage and slowly during the later stage of the bubble life.

It was found that tendencies of mass tranfer were increased when rising bur)1)toes oscillated and its shape was changed.

The calculated drag force coefficients turned out to be in good agreements with the relations of Sherwood number and Peclet number, applied to power-law model.