Mass-transfer coefficients in packed beds at very low reynolds numbers
Mass-transfer coefficients in packed beds at very low reynolds numbers
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非常低雷诺数下填充床的传质系数
DOI：
10.1016/0017-9310(82)90069-2
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发表时间：
1982
影响因子：
5.2
通讯作者：
J. Newman
中科院分区：
文献类型：
--
作者：
P. Fedkiw;J. Newman
在低雷诺数(0.00271<；v/av<；0.198)下，用电化学技术测量了准确的、传质控制的填充床传质系数。在低Péclet数时，数据显示出对床长的强烈依赖性，但当流速较高时，这种依赖性减弱。结果用双尺寸直孔模型进行关联，该床的孔体积的1.46%被认为是直径比剩余孔的直径大56%的孔。较大的气孔导致流动不均匀，并在较低的Péclet数下显著减少传质。
Accurate, transport-controlled, mass transfer coefficients for packed beds have been measured by an electrochemical technique at low Reynolds numbers (0.00271 <v/av< 0.198). At low Péclet numbers, the data show a strong dependence upon the bed length, but this dependence diminishes at the higher flow rates. The results are correlated by a dual-sized, straight-pore model for the bed's pore volume.The bed behaves as though 1.46% of the pore volume were in pores whose diameter is 56% greater than the diameter of the remaining pores. The larger pores result in a flow maldistribution and significantly reduce mass transfer at the lower Péclet numbers.