筛板上气泡群的传质

本文采用不稳态解吸平均浓度法研究筛板上液相体积传质系数.该方法不需要测定复杂的混合参数,方法简单,结果可靠.实验是在直径为142mm的筛板塔内进行CO_2的解吸,研究了孔径、开孔率、空塔气速、清液高度和液体性质对液相体积传质系数的影响.根据气泡直径分布密度函数,导出了气泡群传质模型,并用以关联实验结果,得到:(?)=3.64×10~(-2)(?)~(0.24)Fr~(-0.55)ε_g/(1-ε_g)(?)关联式与实验数据吻合较好.

Mass Transfer of Bubble Swarms on Sieve Plate

The volumetric liquid-phase mass transfer coefficients on sieve plate have been investigated by unsteady state desorption and average concentration method. In this method there is no need for measuring the complex mixing parameters, this method is very simple and the result is reliable. Experiments were carried out with CO2 desorption by air on a ID 142mm sieve plate. The effects of hole diameter, free area, superficial gas velocity, height of s-tat-ic liquid and physical properties of liquid on the volumetric mass transfer coefficients were studied. According to the distribution of bubble diameter, the mass transfer model for swarms of bubbles was derived to correlate the experimental results:This correlation agreed well with the experimental data.