关键词: 膜分离技术;数学模型;光纤模块;CO₂;二氧化碳;质量传递

Abstract: Based on the membrane-based absorption experiment of CO2 into water, shell-side flow
distribution and mass transfer in a randomly packed hollow fiber module have been analyzed
using subchannel model and unsteady penetration mass transfer theory. The cross section of
module is subdivided into many small cells which contains only one hollow-fiber. The cross
sectional area distribution of these cells is presented by the normal probability density
distribution function. It has been obtained that there was a most serious non-ideal flow in
shell side at moderate mean packing density, and the large amount of fluid flowed and
transferred mass through a small number of large voids. Thus mass transfer process is
dominated by the fluid through the larger void area. The mass transfer process in each cell
is described by the unsteady penetration theory. The overall mass transfer coefficient
equals to the probability addition of the mean mass transfer coefficient in each cell. The
comparisons of the values calculated by the model established with the empirical
correlations and the experimental data of this work have been done.The predicted overall
mass transfer coefficients are in good agreement with experimental data.

Key words: hollow fiber membrane module, mass transfer, membrane separation, mathematic model