H. Bakhtiary, F. Hayer, H. Venvik, A. Holmen
Norwegian University of Science and Technology Trondheim
Methanol synthesis is a typical reaction in heterogeneous catalysis. In this work, we have studied a laboratory fixed-bed reactor packed with a Cu/Zn/Al2O3 catalyst in both adiabatic and isothermal tubular operational modes. A methanol synthesis kinetic model was implemented in COMSOL Reaction Engineering Lab. Both 1D and 2D pseudo-homogeneous dispersion models were applied to describe the mass ...
Rensselaer Polytechnic Institute, Troy, NY, USA
A model was developed to simulate the reaction, concentration field, flow field, and temperature distribution inside a Claus reactor for converting hydrogen sulfide to sulfur. The model considered two ideal reactors, a continuous stirred tank reactor and a plug flow reactor. As expected, two ideal reactors showed much different behaviors in terms of reactant conversion and operating ...
N. Ghasem, M. Al-Marzouqi, N. Abdul Rahim
UAE University, Al-Ain, United Arab Emirates
A comprehensive mathematical model that includes mass and heat transfer was developed for the transport of gas mixture of carbon dioxide and methane through hollow fiber membrane (HFM) contactor. COMSOL Multiphysics® was used in solving the set of partial, ordinary and algebraic equations. The model was based on "non-wetted mode" in which the gas mixture filled the membrane pores for ...
S.C. Seetharam, D. Jacques
Performance Assessments Unit, Institute for Environment, Health and Safety, Belgian Nuclear Research Centre (SCK•CEN), Mol, Belgium
This paper documents current status in the development of a coupled thermal-hydraulic-chemical-geomechanical numerical suite within COMSOL-MATLAB environment to address soil and concrete applications. The mathematical formulations are based on well-established continuum scale models unifying mass conservation, energy conservation, charge conservation, thermodynamic equilibrium and kinetics and ...
The Effect of Electrolyte Flow Slots in Tooling Electrodes on Workpiece Surface Finish in Electrochemical Machining
Oregon State University, Corvallis, OR, USA
Electrochemical machining (ECM) uses electrolysis to precisely remove material at high rates. ECM has many advantages over conventional machining: no tool wear, no induced mechanical or thermal stresses, high removal rates virtually independent of material hardness or strength, and excellent surface finishes. However, challenges can arise during the design of the tooling electrode when ...
T. Marin-Alvarado ,
 M4Dynamics, Toronto, ON, Canada
An external library, M4Dlib , has been developed to solve multiphysics problems coupled to solution thermodynamics. This approach extends the local equilibrium concept to multiphysics modeling by incorporating a full Gibbs energy minimization routine at each numerical node to calculate the equilibrium based on global temperature, enthalpy or concentration conditions (Figure 1). The ...
L. Tong ,
 Keisoku Engineering System Co., Ltd., Chiyoda-ku, Tokyo, Japan
There is great interest in developing all-solid-state lithium-ion batteries. They are ideal micro-power sources for many applications in portable electronic devices, electric vehicles and biomedical engineering. It is known that all-solid-state lithium-ion batteries are often fabricated by thin film methods, with thicknesses in the range of a few micrometers. Since porous electrodes are not ...
S. Odiba, M. Olea, S. Hodgson, A. Adgar
Teesside University, School of Science and Engineering, Middlesbrough, United Kingdom
This research deals with the design of suitable microreactors for the catalytic oxidation of volatile organic compound (VOCs), using propane as a model molecule. The microreactor considered consists of eleven parallel channels, in which an Au/Cr/γ-Al2O3-catalyzed combustion reaction takes place. Each channel is 0.5 mm diameter and 100 mm long. The catalytic microreactor was simulated for ...
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 cells. ...
Modeling Heat and Moisture Transport During Hydration of Cement-Based Materials in Semi-Adiabatic Conditions - new
E. Hernandez-Bautista[1,2], D. Bentz, S. Sandoval-Torres, P. Cano-Barrita
National Institute of Standards and Technology, Gaithersburg, MD, USA
Instituto Politécnico Nacional/CIIDIR Unidad Oaxaca, Oaxaca, México
The process of accelerated curing of pre-cast concrete has a significant importance in the thermal behavior of concrete. A multiphysics model that describes hydration and heat and mass transport in cement based materials was developed. The hydration reactions are described by a maturity function that uses the equivalent time concept, thereby describing the change in the degree of hydration based ...