Analysis and interpretation of residence time distribution experimental curves in FM01-LC reactor using axial dispersion and plug dispersion exchange models with closed–closed boundary conditions

The liquid phase mixing flow pattern at low (20 < Re < 120) and intermediate liquid flow rate (120 < Re < 400) was studied by means of residence time distribution (RTD) experimental curve in an up-flow Filter Press electrochemical reactor (FM01-LC) bench scale. For this purpose, a plasti...

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Bibliographic Details
Published in:Electrochimica acta 2010-12, Vol.56 (1), p.361-371
Main Authors: Rivera, Fernando F., Cruz-Díaz, Martín R., Rivero, Eligio P., González, Ignacio
Format: Article
Language:English
Subjects:
ADM
Channelling
Chemistry
Closed–closed boundary
Computational fluid dynamics
Dispersions
Electrochemistry
Exact sciences and technology
FM01-LC
General and physical chemistry
Liquid phases
Mathematical analysis
Partial differential equations
PDE
Reactors
Residence time distribution
RTD
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Summary:The liquid phase mixing flow pattern at low (20 < Re < 120) and intermediate liquid flow rate (120 < Re < 400) was studied by means of residence time distribution (RTD) experimental curve in an up-flow Filter Press electrochemical reactor (FM01-LC) bench scale. For this purpose, a plastic turbulence promoter was used with stainless-steel and platinised titanium structural meshes as electrodes in channel configuration. To visualize and determine the mixing flow pattern in the liquid phase, the stimulus-response technique was employed using dextran blue ( D M = 1.058 × 10 −11 m 2 s −1, 25 °C, in water) as model tracer. A theoretical analysis and approximation RTD experimental curves with axial dispersion model (ADM) and plug dispersion exchange model (PDE), with “closed–closed vessel” boundary conditions were used in order to establish a better approximation of the axial dispersion, stagnant zones, channelling and by-pass (preference flow) effects present at low and intermediate Re. RTD curves show that the liquid flow pattern in the FM01-LC deviates considerably from axial dispersion model at low Re, where the FM01-LC exhibits large channelling, stagnant zones, and dead zone. The PDE model represents fairly this deviation from ideal flow (less dead zone).
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2010.08.069