Journal ArticleDOI
Residence time distribution of the liquid in two‐phase cocurrent downflow in packed beds: Air/newtonian and non‐newtonian liquid systems
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In this article, the liquid residence time distribution for two-phase downflow of air-water and non-Newtonian liquids through packed beds of porous and nonporous particles is presented.Abstract:
New data on the liquid residence time distribution for two-phase downflow of air-Newtonian and non-Newtonian liquids through packed beds of porous and non-porous particles are presented. The piston-dispersion-exchange model is used to describe the liquid flow. With porous particles the dynamic evolution of the tracer concentration in the particles is described in terms of diffusion phenomena. The axial dispersion is very important in the case of two-phase downflow of air-water (trickle flow regime) and air-CMC systems through fixed beds with porous particles, and is negligible in the case of non-porous particles. With the porous particles, a key value is the effective diffusion coefficient of the tracer in the pores of the particles.read more
Citations
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Pressure Drop and Liquid Holdup in Trickle Flow Reactors: Improved Ergun Constants and Slip Correlations for the Slit Model
TL;DR: In this paper, state-of-the-art correlations for shear and velocity slip factors and Ergun single-phase flow bed constants (Blake−Kozeny−Carman and Burke−Plummer bed parameters) were developed.
Journal ArticleDOI
Trickle bed hydrodynamics and flow regime transition at elevated temperature for a Newtonian and a non-Newtonian liquid
Bora Aydin,Faïçal Larachi +1 more
TL;DR: In this paper, the authors demonstrate experimentally the temperature shift of trickle-to-pulse flow regime transition, pulse velocity, two-phase pressure drop, liquid holdup and liquid axial dispersion coefficient.
Journal ArticleDOI
Improving the prediction of liquid back-mixing in trickle-bed reactors using a neural network approach
TL;DR: In this article, a comprehensive database containing 973 liquid axial dispersion coefficient measurements (DAX) for trickle-bed operation reported in 22 publications between 1958 and 2001 was used to assess the convenience of the few available correlations.
Journal ArticleDOI
New mechanistic film model for pressure drop and liquid holdup in trickle flow reactors
TL;DR: In this article, a mechanistic film model was proposed for the description of trickle-bed reactor hydrodynamic parameters (two-phase pressure drop, total external liquid holdup) in the low interaction regime.
Journal ArticleDOI
Catalytic wet air oxidation with a deactivating catalyst analysis of fixed and sparged three-phase reactors
TL;DR: In this paper, a comparative analysis is made for a trickle-bed reactor, a packed-bubble column, a three-phase fluidized bed and a slurry-bubble column with an active and moderately deactivating catalyst for the wet oxidation at high pressure and temperature of organic-containing aqueous wastes.
References
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Journal ArticleDOI
Residence time distribution of the liquid in gas-liquid cocurrent upflow fixed-bed reactors with porous particles
TL;DR: In this paper, the authors present the first experimental investigation of the residence time distribution of the liquid in gas with porous particles, showing that only a relatively small fraction of the pore volume is accessible to the tracer.
Journal ArticleDOI
Packed Bed Liquid Phase Dispersion in Pulsed Gas-Liquid Downflow
TL;DR: In this article, a theoretical analysis of a pulsed gas-liquid downward flow through a packed bed showed that the axial dispersion of the liquid-phase observed in such flows is mainly caused by the difference in velocity and rapid mixing between fast-moving liquid slugs and slow moving liquid films, which was described by a model which considered the liquid phase as consisting of two continuous phases flowing cocurrently at different velocities with continuous material exchange between the two streams.
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Laminar Flow Dissolution and Diffusion in Non-Newtonian Fluid
Surendra Kumar,S. N. Upadhyay +1 more
Journal ArticleDOI
Simulation of liquid hydrodynamics in cocurrent two-phase upward flow through a packed bed
TL;DR: In this article, the authors examined the hydrodynamic modelling of a liquid in a cocurrent two-phase upflow packed bed reactor and interpreted the dynamic response curves using the piston dispersion exchange model.