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Abstract
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The scope of this study is to model the absorption of CO2 in water via
an asymmetric hollow fiber membrane contactor based on the resistance
modelling approach. In the previous research, membrane structure was
divided into only three regions of shell stream, bulk of membrane and
lumen stream, i.e. a symmetric structure, whereas in the current study the
role of another important resistance i.e. skin layer was deeply considered.
In this way, without considering illegal values for the system tuning
parameters the modelling results were enhanced e.g. 1.5 versus 4 for
tortuosity. The predictions of the proposed model were confirmed by the
experimental data i.e. a percentage of average absolute relative error of
less than 6%. The results also showed that the increase in effective surface
porosity leads to more descending trend of the mass transfer resistance
relative to the bulk porosity that is due to the higher order of magnitude (2
order) of the skin layer resistance in comparison to that of the substrate.
In addition, the findings demonstrated that, the model proposed in this
work is prone to offer a useful tool to improve our knowledge about the
asymmetric membrane contactors.
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