Mass transfer between isobutanol and water in a spray-column
Mass transfer between isobutanol and water in a spray-column
复制标题
喷雾塔中异丁醇和水之间的传质
DOI：
10.1016/0009-2509(54)80017-0
复制
发表时间：
1954
影响因子：
4.7
通讯作者：
H. Talsma
中科院分区：
文献类型：
--
作者：
P. M. Heertjes;W. A. Holve;H. Talsma
采用二元混合物和液滴系统研究了连续相和不连续相之间液体边界的传质速率。由于液滴的密度和运动的差异，连续相似乎被彻底混合。这导致几乎恒定的浓度，与柱的高度无关。对于连续相，部分传质系数k c的关系式为k c d d/D= Sh= hRe d 1 2 Sc c 1 2。用该方程对实验结果进行关联，结果令人满意。上述关系式中的常数x似乎是相对界面速度的函数，而相对界面速度又是液滴和周围流体的粘度的函数。根据H adamard的概念，该函数取为η c/η c+ η d。该机理图代表了液滴中的循环不受界面张力限制的情况。考虑液滴内循环的发生，Kronig和B rink的非稳态方程能较好地描述异丁醇液滴自由上升的实验结果。水滴显示出与克罗尼格线的偏离，可能是由于水滴在异丁醇中的“漂浮”效应。
A study of the rate of mass transfer across a liquid boundary between a discontinuous and a continuous phase, using a binary mixture and a droplet system has been made. Because of differences in density and movement of the drops the continuous phase appeared to be thoroughly mixed. This resulted in a nearly constant concentration independent of the height of the column. For the continuous phase a relation for the partial mass transfer coefficient k c in the form k c d d/D= Sh= hRe d 1 2 Sc c 1 2 has been used. Satisfactory correlation of the experimental results could be obtained with this equation. The constant x in the above relation appeared to be a function of the relative interfacial velocity which in turn is a function of the viscosities of the drops and the surrounding fluids. Following the concept of H adamard this function is taken as η c/η c+ η d. This picture of the mechanism is representative of the situation, when the circulation in the drop is not restricted by interfacial tension. For transfer to the discontinuous phase the unsteady state equation of K ronig and B rink, considering the occurrence of internal droplet circulation, was shown to express fairly adequately the experimental results for free rise of isobutanol droplets. Water drops showed a divergence from the Kronig-line possibly due to the “floating” effect of water droplets in isobutanol.