scholarly journals Synthetic Packed-Bed Generation for CFD Simulations: Blender vs. STAR-CCM+

2019 ◽  
Vol 3 (2) ◽  
pp. 52 ◽  
Author(s):  
Steffen Flaischlen ◽  
Gregor D. Wehinger
Keyword(s):  
Open Source Software ◽  
Fluid Dynamic ◽  
Fixed Bed ◽  
Packed Bed ◽  
Process Industry ◽  
Particle Orientation ◽  
Fixed Bed Reactor ◽  
Cfd Simulations ◽  
Shape Approximation ◽  
Rigid Body Model

A common reactor type in the chemical and process industry is the fixed-bed reactor. Accurate modeling can be achieved with particle-resolved computational fluid dynamic (CFD) simulations. However, the underlying bed morphology plays a paramount role. Synthetic bed-generation methods are much more flexible and faster than image-based approaches. In this study, we look critically at the two different bed generation methods: Discrete element method (DEM) (in the commercial software STAR-CCM+) and the rigid-body model (in the open-source software Blender). The two approaches are compared in terms of synthetically generated beds with experimental data of overall and radial porosity, particle orientation, as well as radial velocities. Both models show accurate agreement for the porosity. However, only Blender shows similar particle orientation than the experimental results. The main drawback of the DEM is the long calculation time and the shape approximation with composite particles.

scholarly journals Synthetic Packed-Bed Generation for CFD Simulations: Blender vs. STAR-CCM+

2019 ◽  
Author(s):  
Steffen Flaischlen ◽  
Gregor D. Wehinger
Keyword(s):  
Open Source Software ◽  
Fluid Dynamic ◽  
Fixed Bed ◽  
Packed Bed ◽  
Process Industry ◽  
Particle Orientation ◽  
Fixed Bed Reactor ◽  
Cfd Simulations ◽  
Shape Approximation ◽  
Rigid Body Model

A common reactor type in the chemical and process industry is the fixed-bed reactor. Accurate modeling can be achieved with particle-resolved Computational Fluid Dynamic (CFD) simulations. However, the underlying bed morphology plays a paramount role. Synthetic bed-generation methods are much more flexible and faster than image-based approaches. In this study, we look critically at the two different bed generation methods: Discrete Element Method (DEM) (in the commercial software STAR-CCM+) and the rigid-body model (in the open-source software Blender). The two approaches are compared in terms of synthetically generated beds with experimental data of overall and radial porosity, particle orientation, as well as radial velocities. Both models show accurate agreement for the porosity. However, only Blender shows similar particle orientation than the experimental results. The main drawback of the DEM is the long calculation time and the shape approximation with composite particles.  

Design of a continuous flow immobilized-cell reactor for biosynthetical production of L-aspartic acid

1985 ◽  
Vol 50 (10) ◽  
pp. 2122-2133 ◽  
Author(s):  
Jindřich Zahradník ◽  
Marie Fialová ◽  
Jan Škoda ◽  
Helena Škodová
Keyword(s):  
Aspartic Acid ◽  
Continuous Flow ◽  
Immobilized Cells ◽  
Scale Up ◽  
Fixed Bed ◽  
Packed Bed ◽  
Fixed Bed Reactor ◽  
Experimental Program ◽  
Design Parameters ◽  
Immobilized Cell

An experimental study was carried out aimed at establishing a data base for an optimum design of a continuous flow fixed-bed reactor for biotransformation of ammonium fumarate to L-aspartic acid catalyzed by immobilized cells of the strain Escherichia alcalescens dispar group. The experimental program included studies of the effect of reactor geometry, catalytic particle size, and packed bed arrangement on reactor hydrodynamics and on the rate of substrate conversion. An expression for the effective reaction rate was derived including the effect of mass transfer and conditions of the safe conversion-data scale-up were defined. Suggestions for the design of a pilot plant reactor (100 t/year) were formulated and decisive design parameters of such reactor were estimated for several variants of problem formulation.

Investigation of radial heat transfer in a fixed-bed reactor: CFD simulations and profile measurements

2017 ◽  
Vol 317 ◽  
pp. 204-214 ◽  
Author(s):  
Ying Dong ◽  
Bahne Sosna ◽  
Oliver Korup ◽  
Frank Rosowski ◽  
Raimund Horn
Keyword(s):  
Heat Transfer ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Cfd Simulations ◽  
Radial Heat

scholarly journals Solvability of the Brinkman-Forchheimer-Darcy Equation

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Piotr Skrzypacz ◽  
Dongming Wei
Keyword(s):  
Fixed Bed ◽  
Packed Bed ◽  
Reynolds Numbers ◽  
Fixed Bed Reactor ◽  
Small Data ◽  
Convective Flows ◽  
Finite Element Approximations ◽  
Darcy Equation ◽  
Variable Porosity ◽  
Porous Medium Flow

The nonlinear Brinkman-Forchheimer-Darcy equation is used to model some porous medium flow in chemical reactors of packed bed type. The results concerning the existence and uniqueness of a weak solution are presented for nonlinear convective flows in medium with variable porosity and for small data. Furthermore, the finite element approximations to the flow profiles in the fixed bed reactor are presented for several Reynolds numbers at the non-Darcy’s range.

Hydrate-Based Carbon Capture Process: Assessment of Various Packed Bed Systems for Boosted Kinetics of Hydrate Formation

2020 ◽  
Vol 143 (3) ◽  
Author(s):  
Amit Arora ◽  
Asheesh Kumar ◽  
Gaurav Bhattacharjee ◽  
Chandrajit Balomajumder ◽  
Pushpendra Kumar
Keyword(s):  
Carbon Dioxide ◽  
Carbon Capture ◽  
Carbon Dioxide Capture ◽  
Fixed Bed ◽  
Hydrate Formation ◽  
Packed Bed ◽  
Fixed Bed Reactor ◽  
Capture Process ◽  
Novel Technologies ◽  
Kinetics Of

Abstract The case for developing novel technologies for carbon dioxide (CO2) capture is fast gaining traction owing to increasing levels of anthropogenic CO2 being emitted into the atmosphere. Here, we have studied the hydrate-based carbon dioxide capture and separation process from a fundamental viewpoint by exploring the use of various packed bed media to enhance the kinetics of hydrate formation using pure CO2 as the hydrate former. We established the fixed bed reactor (FBR) configuration as a superior option over the commonly used stirred tank reactor (STR) setups typically used for hydrate formation studies by showing enhanced hydrate formation kinetics using the former. For the various packing material studied, we have observed silica gel with 100 nm pore size to return the best kinetic performance, corresponding to a water to hydrate conversion of 28 mol% for 3 h of hydrate growth. The fundamental results obtained in the present study set up a solid foundation for follow-up works with a more applied perspective and should be of interest to researchers working in the carbon dioxide capture and storage and gas hydrate fields alike.

scholarly journals Computational Fluid Dynamic Modeling and Simulation of Hydrocracking of Vacuum Gas Oil in a Fixed-Bed Reactor

ACS Omega ◽  
2020 ◽  
Vol 5 (27) ◽  
pp. 16595-16601 ◽  
Author(s):  
Davood Faraji ◽  
Samyar Zabihi ◽  
Mahdi Ghadiri ◽  
Sepehr Sadighi ◽  
Ali Taghvaie Nakhjiri ◽  
...  
Keyword(s):  
Modeling And Simulation ◽  
Dynamic Modeling ◽  
Computational Fluid Dynamic ◽  
Fluid Dynamic ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Vacuum Gas Oil ◽  
Gas Oil ◽  
Computational Fluid Dynamic Modeling

Steady State Model for Heat Transfer in a Packed Bed Reactor of Elliptic Cylindrical Shape

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Laércio G. Oliveira ◽  
Ramdayal Swarnakar ◽  
Antonio G. B. de Lima
Keyword(s):  
Heat Transfer ◽  
Steady State ◽  
Fixed Bed ◽  
Packed Bed ◽  
Numerical Results ◽  
Packed Bed Reactor ◽  
Fixed Bed Reactor ◽  
Dimensionless Temperature ◽  
Cylindrical Shape ◽  
Temperature Profiles

The fixed-bed reactors of circular cylindrical geometry with heated or cooled walls are frequently used to carry out heterogeneous reactions of solid-gas type in engineering applications. The design of a fixed bed reactor requires an extensive knowledge of heat transfer characteristics within the packed bed. In this sense, this work presents a three-dimensional mathematical model to predict the heat transfer inside a fixed bed elliptical cylinder heat exchanger. The model considers uniform velocity and temperature profiles of the fluid phase at the entrance of the reactor, and constant thermo-physical properties. The surface of the equipment convective boundary condition is assumed to be constant. The energy equation, written in the elliptical cylindrical coordinates, was discretized using a finite-volume method considering a fully implicit formulation, and WUDS interpolation scheme. Numerical results of the dimensionless temperature profiles inside the packed bed reactor at a steady state are presented and temperature distribution is interpreted. To validate the model, numerical results obtained for the circular cylinder are compared with analytical results from literature and a good agreement was obtained.

Modeling and Simulation of a Packed-bed Reactor for Carrying out the Water-Gas Shift Reaction

2012 ◽  
Vol 10 (1) ◽  
Author(s):  
Yaidelin A. Manrique ◽  
Carlos V. Miguel ◽  
Diogo Mendes ◽  
Adelio Mendes ◽  
Luis M. Madeira
Keyword(s):  
Fixed Bed ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Fixed Bed Reactor ◽  
Water Gas Shift ◽  
Small Scale ◽  
Heterogeneous Model ◽  
Co Conversion ◽  
Reactor Operating ◽  
Water Gas

Abstract In this work the water-gas shift (WGS) process was addressed, with particular emphasis in the development of phenomenological models that can reproduce experimental results in a WGS reactor operating at low temperatures. It was simulated the conversion obtained in a fixed-bed reactor (PBR) packed with a Cu-based catalyst making use of a composed kinetic equation in which the Langmuir-Hinshelwood rate model was used for the lowest temperature range (up to 215 ºC), while for temperatures in the range 215 – 300 ºC a redox model was employed. Several packed-bed reactor models were then proposed, all of them without any fitting parameters. After comparing the simulations against experimental CO conversion data for different temperatures and space time values, it was concluded that the heterogeneous model comprising axial dispersion and mass transfer resistances shows the best fitting. This model revealed also good adherence to other experiments employing different feed compositions (CO and H2O contents); it predicts also the overall trend of increasing CO conversion with the total pressure. This modeling work is particularly important for small scale applications related with hydrogen production/purification for fuel cells.

Performance of a multi-slit packed bed microstructured reactor in the synthesis of methanol: Comparison with a laboratory fixed-bed reactor

2011 ◽  
Vol 66 (24) ◽  
pp. 6350-6357 ◽  
Author(s):  
Hamidreza Bakhtiary-Davijany ◽  
Fatemeh Hayer ◽  
Xuyen Kim Phan ◽  
Rune Myrstad ◽  
Peter Pfeifer ◽  
...  
Keyword(s):  
Fixed Bed ◽  
Packed Bed ◽  
Fixed Bed Reactor ◽  
Microstructured Reactor ◽  
Synthesis Of Methanol
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