Rotating packed disk reactor(RPDR) is a three-phase reactor which can be used in carrying out a reaction involving liquid and gas as reactants.
The purpose of this research is to find out the flow mixing pattern in this reactor and set up an appropriate model using residence time distribution (RTD) of fluid to predict the flow behavior in the scale up.
The flow pattern in the reactor was directly visualized using 50\% glycerin solution and red ink as dye. Based on the observation we could postulate that the fluid can be divided into two regions of mixing : one region where fluid rotates in the same direction of disk due to the rotational inertia and the shear force of fluid, and the other region where fluid rotates in the opposite direction to fill the displaced amount that was sucked into the porous disks.
The fluids in the two regions are highly turbulent. Therefore they can be safely regarded as perfect mixing regions.
Based on these phenomena, three-parameter multi-step model was adopted, with each step composed of two perfect mixing regions and bypassing. And the parameters are the volume ratio of the two perfect mixing regions(Y), flow rate between the two regions(P) and the ratio of bypassing with respect to the overall flow rate(X).
The parameters of the model were obtained by computer from the experimental data, using Marquardt's optimization algorithm. This model was in good agreement with experimental data.
The significance of model parameters were sought from several experimental data by varying rotational speed of disks, flow rate, submergence of disks and size of the glass beads. The relative amount of bypass(X) was negligible in all cases, and following relations for Y and P were obtained.
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