【摘要】 利用传热强化与过程节能教育部重点实验室开发的多级雾化超重力旋转床,采用化学吸收的方法测定了其在不同操作条件下的体积传质系数,并根据双膜理论建立了旋转床中气液两相之间的传质模型.实验结果表明,多级雾化超重力旋转床气液两相间的体积传质系数随气液流量的增加而增大.文中还从实验数据中归纳出了液滴内的传质系数方程,指出丝网层的雾化使液滴在离心力的作用下高速旋转进入雾化区,由于液滴内循环非常剧烈,从而使多级雾化旋转床的液滴内传质系数较高.更多还原

【Abstract】 The volumetric mass transfer coefficients in different operating conditions were measured by means of chemical absorption on a self-developed multistaged spraying rotating packed bed.A mathematical model describing the mass transfer between the liquid and the gas in the packed bed was then established based on the double-film theory.Experimental results show that the volumetric mass transfer coefficient increases with the liquid and gas fluxes.Moreover,an equation expressing the mass transfer coefficient in droplet was induced according to the experimental data,and that,when a droplet leaves the wires,it turns into the spraying area under the action of centrifugal force,and the high circulation speed may result in a great mass transfer coefficient in the droplet.更多还原