Gas-Phase Mass Transfer in a Centrifugal Contactor
Gas-Phase Mass Transfer in a Centrifugal Contactor
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DOI：
10.1021/ie0000818
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发表时间：
2001
影响因子：
4.2
通讯作者：
P. Sandilya;D. P. Rao;A. Sharma;G. Biswas
中科院分区：
文献类型：
--
作者：
P. Sandilya;D. P. Rao;A. Sharma;G. Biswas
据报道，离心式气液接触器中的液侧传质速率比传统填充床中的传质速率高出数倍。然而，目前还没有直接测量气侧传质系数的报道。对金属丝网填料旋转床内气相传质进行了实验研究。与预期相反，气侧传质系数远低于传统填充塔。基于运动方程对气体流动的分析表明，由于填料提供的阻力，气体在转子中经历了类似固体的旋转。因此，传质系数应在与传统填充塔相同的范围内。实验发现该系数的较低值归因于液体分布不均匀。利用密排圆盘作为填料，探讨了通过增加气体与填料之间的滑移来提高传质系数的可能性。用一对圆盘进行了传质研究。结果表明，与丝网填料相比，丝网填料具有更高的通量和传质速率。作为包装的一叠磁盘似乎有希望。
The liquid-side mass transfer rate in a centrifugal gas-liquid contactor has been reported to be several times higher than that in conventional packed beds. However, no direct measurement of the gas-side mass transfer coefficient has been reported. We present experimental studies on gas-side mass transfer in a rotating packed bed with wire-gauze packing. Contrary to expectations, the gas-side mass transfer coefficient was much lower than that in conventional packed columns. An analysis of the gas flow, based on the equations of motion, revealed that the gas undergoes solid-body-like rotation in the rotor because of the drag offered by the packing. Therefore, the mass transfer coefficient should be in the same range as that in conventional packed columns. The lower value of the coefficient found experimentally is attributed to liquid maldistribution. The possibility of enhancing the mass transfer coefficient by enhancing the slip between the gas and the packing was explored by using a stack of closely spaced disks as the packing. Mass transfer studies with a pair of disks were conducted. Higher throughputs and mass transfer rates than those with the wire-gauze packing were obtained. A stack of disks as packing appears to hold promise.