Numerical Simulation For Gas-Liquid Mass Transfer In Rotating Packed Bed

With an outstanding performance in intensifying multiphase mixing and mass transfer, rotating packed bed (i.e. RPB) has attracted considerable attention and extensive exploration in absorption, stripping, distillation, nanomaterial preparation, reaction, and so on.Among all the literatures about RPB,the number of literatures which focused on experimental study or research is much more than that of on modeling study or numerical simulation. In this paper, a mathematical model of gas-liquid mass transfer was established and then the simulation study had been carried out.Based upon the visual study, mass transfer process in a RPB were simplified and essential assumptions were concluded accordingly, which laid the foundation of mathematical model.Within the model,unsteady/steady state mass transfer process were studied and distinguished according to the calculated liquid mass transfer coefficient kL.Then the model was applied to the mass transfer process of water deoxygenation and carbon dioxide absorption by NaOH solution for further numerical simulations. Main conclusions obtained in this work are as follows: Both kL and overall mass transfer coefficient KLa/KGa of the two schemes raised with increase of higee (i.e. high gravity) level as well as temperature. Pressure affected hardly on kL and KLa of water deoxygenation, while could promote the KGa of carbon dioxide chemisorption. Both mass transfer coefficient of the two schemes were influenced slightly by gas flowrate, while increased evidently when liquid flowrate raised. KLa of water deoxygenation raised as inlet concerntration increased, while KGa of carbon dioxide chemisorption changed contrarily. Mass transfer contribution of the cavity zone decreased when diminish the out radius of cavity zone, as well as increasing higee level, which implied packing zone was the main zone for mass transfer.The predicted E (removal efficiency of oxygen and carbon dioxide) obtained from this model agreed relatively well with experimental data from mass transfer experiment extracted from literatures with deviations within±20%, which verified the model established in this paper and were expected to provide a profounder comprehension on gas-liquid mass transfer in a rotating packed bed.