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 ...
E.I. Gkanas, S.S. Makridis, A.K. Stubos, A. Lopez, J. Folch, G. Noriega
Materials for Energy Applications Group, Department of Mechanical Engineering, University of Western Macedonia, Greece
Environmental Technology Laboratory, Institute of Nuclear Technology and Radiation Protection, NCSR “Demokritos”, Greece
Universidad Politécnica De Cataluña, Barcelona, Spain
Cidete INGENIEROS, Barcelona, Spain
Hydrogen storage can be considered as a key factor in the development of hydrogen economy. Hydrogen storage in a magnesium hydride MgH2 is a very promising technique for numerous of reasons. Magnesium is abundant, relatively cheap, life – friendly , weight storage capacity of 7.6% and low price of Mg metal. A simulation work is presented in order to study the absorption kinetics of a Mg – ...
M.K. Ghantasala, B.O. Asimba, A. Khaminwa, K.J. Suthar, D.C. Mancini
Department of Mechanical and Aeronautical Engineering, Western Michigan University, Kalamazoo, MI, USA
Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA
Physical Sciences and Engineering, Argonne National Laboratory, Argonne, IL, USA
The understanding of pH-sensitive hydrogel swelling response in different buffer environmental condition is essential for its use in different practical applications. This necessitates its simulation in steady state and transient conditions. This paper mainly deals with the details of the numerical simulation performed by developing coupled formulation of chemo-electro-mechanical behavior of the ...
Coupled Palaehydrogeological Microbial and Geochemical Reactive Transport Model of the Olkiluoto Site (Finland)
P. Trinchero, M. Luna, J. Molinero, G. Román-Ross, F. Maia, A. Nardi, J. Löfman, P. Pitkänen, L. Koskinen
Amphos 21 Consulting, Barcelona, Spain
VTT Energy, Finland
Posiva Oy, Olkiluoto, Finland
Olkiluoto at Eurajoki has been selected as the final repository site for spent nuclear waste in Finland. This area has been affected, at regional scale, by land-uplift processes related to the ice withdrawal. These events have resulted in a complex and stratified heterogeneous hydrochemical system. The objective of this work was to develop a robust paleohydrogeological reactive transport (PRT) ...
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 ...
M. Brundu, V. Guida
Procter & Gamble Italia, Pomezia, Roma, Italy
The challenge with the use of Sodium Carbonate Peroxyhydrate (Na2CO3*1.5H2O2) as a bleach source in dry detergent formulations is its lower stability in comparison with other materials, and the risk of quality losses of the product over the shelf life. The issue can be solved with the understanding and modeling of the decomposition mechanism of the powder. It is well known that the decomposition ...
J. Ebert, S. Ghosal, A. Emami-Naeini
SC Solutions, Sunnyvale, CA, USA
This paper describes the development of a COMSOL model of Electro-Chemical-Mechanical Planarization (ECMP) that was validated with experimental data. ECMP is used for processing of semiconductor wafers. We developed a 2D model of flow of phosphoric acid solution (the electrolyte) between two parallel plates that focuses on the physics and electrochemistry in ECMP. The model includes steady-state ...
S. Jin, J. McReynolds, X. Li, J. Guan
Department of Biomedical Engineering, College of Engineering, University of Arkansas, Fayetteville, AR, USA
Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, USA
Currently, researchers are looking for ways to mass-produce biologically functional pancreatic beta cells in vitro because of the shortage of donor tissue needed for diabetes cell therapy. The beta cells will become hypoxic if their high oxygen demands are not met. We hypothesized that the biological function of beta cells can be improved if they are cultured in a 3D collagen scaffold, which ...
Advancements in Carbon Dioxide and Water Vapor Separations Using COMSOL Multiphysics® Software - new
J. Knox, R. F. Coker, C. F. Gomez, R. Schunk, R. Cummings
NASA Marshall Space Flight Center, Huntsville, AL, USA
NASA's Advanced Exploration Systems (AES) program is pioneering new approaches for rapidly developing prototype systems, demonstrating key capabilities, and validating operational concepts for future human missions beyond Earth orbit" . Under the new Atmosphere Revitalization Recovery and Environmental Monitoring (ARREM) project , efforts are focused on improving current state-of-the-art ...
K. Cluff, H. Mehraein, B. Jayakumar
Department of Bioengineering, Wichita State University, Wichita, KS, USA
Department of Industrial & Manufacturing Engineering, Wichita State University, Wichita, KS, USA
Background: Peripheral arterial disease (PAD) is characterized by atherosclerotic blockages of the arteries supplying the lower extremities, which cause a progressive accumulation of ischemic injury to the skeletal muscles of the lower limbs. Despite revascularization treatment intervention some PAD patients require follow up secondary treatment due to a continued decline in limb function, ...