中空纤维管随机分布时透析器内的管外传质

利用Matlab软件计算了中空纤维透析器外壳内壁面(简称壁面)影响下，中空纤维随机分布、管外流场充分发展、纤维表面定质量流量时的管外流场分布，进而求得了不同填充密度下透析器的管外传质系数. 结果表明，中空纤维的排布方式对传质系数有很大的影响;在所研究的中空纤维填充密度范围内(10%～50%)，随着填充密度的增大，透析器的管外传质系数先变大，后变小;其随机性整体上逐渐减小.

Shell-side mass transfer coefficient in randomly packed hollow fiber bundles

Mass transfer coefficient is one of the main parameters to evaluate the performance of hollow fiber modules.With the help of Matlab software, the shell-side flow field was simulated numerically under the condition of well-developed fluid flow.The theoretical model considers the effects of both the inner wall of the module shell and the random distribution of the hollow fibers on the shell-side mass transfer performance.For different packing densities of hollow fibers, the concentration field and the shell-side mass transfer coefficients of dialyzers were obtained with the concentration boundary condition of constant wall flux.The results showed that the packing/distribution of hollow fibers had a great effect on the shell-side mass transfer coefficient.Within the range of packing density studied (10%—50%), when the packing density increased, the shell-side mass transfer coefficient firstly increased and then decreased, and its randomicity decreased in general.