A theoretical and experimental analysis of membrane bioreactors behavior in unsteady-state conditions
Department of Chemical Engineering and Materials University of Calabria, Rende (CS), ITALY
The behavior of hollow fiber membrane bioreactors operating in recycle configuration is characterized from both theoretical and experimental point of view. The theoretical model is based on the unsteady-state balance equations governing momentum and mass transfer within the regions that can be identified in a hollow fiber reacting system with immobilized enzyme, coupled to the unsteady-state mass ...
Study of the CO2 Transfer Rate in a Reacting Flow for the Refined Sodium Bicarbonate Production Process
C. Wylock, A. Larcy, P. Colinet, T. Cartage, and B. Haut
Université Libre de Bruxelles, Brussels, Belgium
Solvay S.A., Brussels, Belgium
This work deals with the quantification of the CO2 transfer rate from a bubble to the surrounding liquid in a bubble column. A model is successfully developed using COMSOL Multiphysics. The validated model is used to study the enhancement influence of chemical reactions on the transfer rate. Moreover, the results of this study are compared with a classical 1-D approach and excellent comparison is ...
A Finite Element Analysis on the Modeling of Heat Release Rate, as Assessed by a Cone Calorimeter, of Char Forming Polycarbonate
D. Statler, and R. Gupta
Mid-Atlantic Technology, Research and Innovation Center, South Charleston, WV, USA
Department of Chemical Engineering, West Virginia University, Morgantown, WV, USA
During the pyrolysis and combustion of polymers, heat is released and is typically measured with a cone calorimeter to better assess the polymer’s flammability. Modeling heat release rate, as assessed by cone calorimetry, has not been extensively studied for char-forming polymers, such as, polycarbonate. Here we determine the heat release rate with the help of a one-dimensional transient finite ...
Fundamental Three Dimensional Modeling and Parameter Estimation of a Diesel Oxidation Catalyst for Heavy Duty Trucks
A. Holmqvist and C.U.I. Odenbrand
Department of Chemical Engineering, Faculty of Engineering, LTH, Lund University, Lund, Sweden
Mathematical optimization can be used as a computational engine to generate the best solution for a given problem in a systematic and efficient way. In the context of monolithic converter systems, the parameter estimation problem (or inverse problem) is solved using Partial Differential Equations (PDE)-based models of the physical system coupled with an optimization algorithm. These problems are ...
C. Bayer, S. Stiefel, M. Follmann, and T. Melin
AVT Chemical Process Engineering, RWTH Aachen University, Aachen, Germany
Reactive extraction of organic acids from an aqueous solution to an alkaline stripping fluid is based on a selective barrier allowing permeation of non-polar molecules, which subsequently react with the stripping agent. The shift from the organic acid to its base induced by the chemical equilibrium enhances mass transfer inside the membrane’s porous substructure. A model of the porous layer ...
M. Al-Rawashdeh[1,2], V. Hessel[1,2], P. Löb, and F. Schönfeld
Institut für Mikrotechnik Mainz GmbH, Mainz, Germany
Department of Chemical Engineering and
Chemistry, Eindhoven University of Technology, Eindhoven, Netherlands
Gas-liquid falling film microreactors carry out fast exothermic and mass transfer limited reactions. Since the major rate limiting steps occur on the liquid side, it is important to account for a realistic liquid film profile within the reactor simulation. Based on realistic channel geometry and liquid menisci profiles, we describe the liquid film thicknesses, flow velocities, species transport ...
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 ...
H.K. Yang, S.C. Tseng
Institute of Mechanical Engineering, National Yunlin University of Science Technology, Taiwan
In order to perform rust surface treatment for stainless wires, we proposed an electrolyzing equipment to do so. It has the following advantages: safer, cheaper and less environmental pollution. To study the performance of the electrolyzing process, numerical simulation for electric fields will be conducted by using COMSOL Multiphysics software. Taguchi methods was also used to obtain better ...
S. Makridis, E.I. Gkanas, A. Ioannidou, E.S. Kikkinides, A.K. Stubos
Department of Mechanical Engineering, University of Western Macedonia, Kozani, Greece & Environmental Research Laboratory, Institute of Nuclear Technology and Radiation Protection, NCSR “Demokritos”, Athens, Greece
Department of Mechanical Engineering, University of Western Macedonia, Kozani, Greece
Environmental Research Laboratory, Institute of Nuclear Technology and Radiation Protection, NCSR “Demokritos”, Athens, Greece
Hydrogen, the most abundant element in the universe, has great potential as an energy source, and can be generated from renewable energy sources. We used COMSOL for the solution of the energy, mass and momentum balance equations that describe the hydrogen absorption and desorption procedure in the metal hydride compressor. Thermodynamic or engineering properties like the reaction enthalpy ??, ...
J.M. Cormier, F. Ouni, and A. Khacef
Gliding discharges at atmospheric pressure were investigated in the GREMI laboratory for different applications such as syngas production from methane steam reforming. In our case, the kinetics could be described by using a simplified second order model in which the rate reaction coefficient is obtained from a linearization of parameters. Calculated and experimental data are presented ...