S. Pietrzyk, A. Y. Khodakov, and C. Dujardin
Unité Catalyse et Chimie du Solide, Université des Sciences et Technologies de Lille, Ecole Nationale Supérieure de Chimie de Lille, Ecole Centrale de Lille, Villeneuve d’Ascq, France
Operando reactors are used to study, qualitatively and/or quantitatively, active sites of the catalyst and the intermediates of a catalytic heterogeneous chemical reaction, while the reaction is being carried out ("in situ, on-line catalysis studies"). In the present work, an operando reactor using transmission infra-red (IR) absorption spectroscopy has been used to study the Fischer-Tropsch ...
Institut für Automatisierungstechnik, Otto-von-Guericke Universität, Magdeburg, Germany
Preparative chromatography is an important separation method where the simulated moving bed (SMB) technology is an increasingly used separation process for binary mixtures. Several chromatographic columns are arranged in a ring where the feedings and drains are changed cyclically to maintain a continuous separation. For this reason, an adaptive controller is proposed to adjust the flow rates ...
Analysis of Heat, Mass Transport, and Momentum Transport Effects in Complex Catalyst Shapes for Gas-Phase Heterogeneous Reactions Using COMSOL Multiphysics
A. Nagaraj, and P. Mills
Department of Electrical Engineering and Computer Science, Texas A&M University, Kingsville, TX, USA
Department of Chemical and Natural Gas Engineering, Texas A&M University, Kingsville, TX, USA
The global demand for sulfuric acid has been forecast to grow at an average of 2.6% per year from 2005 – 2010. The primary objective of this work is to analyze the performance of various heterogeneous catalyst shapes that have been proposed for the oxidation of SO2 to SO3 used in the manufacture of sulfuric acid. COMSOL Multiphysics provides a powerful numerical platform for simulation of ...
G. Petrone, G. Cammarata, S. Caggia, and M. Anastasi
Department of Industrial and Mechanical Engineering, University of Catania, Catania, Italy
Engineering Maintenance - ISAB Energy Services, Priolo Gargallo, Italy
In this study, COMSOL Multiphysics is applied in order to simulate reacting flows for duct burner systems arranged in the post-firing section of a Heat Recovery Steam Generator of a combined cycle power plant. Two- and three-dimensional simulations are carried out in order to investigate on operative conditions mainly responsible of duct burners overheating. The results are obtained for several ...
R. Painter, S. Berryhill, L. Sharpe, S. K. Hargrove
Department of Civil Engineering, Tennessee State University, Nashville, TN, USA
Department of Mechanical Engineering, Tennessee State University, Nashville, TN, USA
COMSOL® "Single Particle Model for Lithium-Ion Batteries” (Model ID: 14527) is generalized to include an energy balance. This is accomplished by approximating the solution phase polarization as a function of current and temperature. The theoretical approach for this work is similar to Guo et al. [Journal of the Electrochemical Society, 158, (2) A122-A132 (2011)] for modeling lithium ion ...
A. Solimeno, J. Garcia
Department of Hydraulic, Maritime and Environmental Engineering, Universitat Politècnica de Catalunya, Barcelona, Spain
Universitat Politecnica de Catalunya, Barcelona, Spain
The aim of present work is to present and calibrate a new mechanistic model that includes physical and biokinetic processes to reproduce the algae growth in photobioreactor or ponds during long-term scenarios. A COMSOL Multiphysics® model is used to implement the microalgae processes mainly based on River Water Quality Model 1 (RWQM1) (Reichert et al., 2011). The main innovation of the model is ...
L. F. de Souza
Universidade Federal do Paraná, Curitiba, Paraná, Brazil
A simple steady-state photo-fermentative biochemical model was developed using the COMSOL Multiphysics'® Transport of Diluted Species physics interface. A dimensionless model seeks optimal physical parameters based on given biochemical parameters found in literature. A parametric sweep of the physical parameters is enabled without altering the mesh. Other limitations can be easily added to this ...
H. Zhu, T. Gulati, K. Huang, A.K. Datta
Sichuan University, Chengdu, Sichuan, China
Cornell University, Ithaca, NY, USA
Mathematical description of microwave drying requires the solution of two different physics: electromagnetics in the microwave oven cavity and food material and, transport process (mass, momentum and heat transport) in the food material. Maxwell’s equations for electromagnetics were solved using the RF Module using the GMRES iterative solver with the GeometricMultigrid preconditioner. Mass, ...
Computations on the coupled heat and mass transfer during fires in bulk materials, coal deposits and waste dumps
Krause, U., Schmidt, M., Lohrer, C.
Federal Institute for Materials Research and Testing (BAM), Division II.2 “Reactive Substances and systems”, Berlin, Germany
In porous combustible matter low-rate oxidation takes place at ambient conditions. In large stockpiles of bulk goods, coal heaps, waste dumps etc. it may occur that the heat released by the oxidation reaction is not fully transmitted to the surroundings but raises the temperature within the deposit. This triggers a positive feed-back loop since the oxidation rate increases with temperature. The ...
A. Machac , R. Henda , and B. Nilsson 
 School of Engineering, Laurentian University, Sudbury, ON, Canada
 Lund University, Sweden
Heat and mass transport phenomena in a tubular catalytic bed reactor are numerically investigated. A two-dimensional pseudo-heterogeneous model, accounting for transport in the solid and fluid phases, with axial and radial dispersions, is used to describe the reactor. The calculation results show the development of a hot spot in the reactor. The effects of inlet process conditions are ...