K. O. Lund , S. M. Lord ,
 Kurt Lund Consulting (COMSOL Certified Consultant), Del Mar, CA, USA
 SML Associates, Encinitas, CA, USA
A frequently occurring geometry for heat exchangers is that of a long tube wound into a helix or spiral around a core volume. There is to be heat exchange between the tube and the gases (or solids) in the core. However, the length scales of these two parts of the geometry are very different, thus complicating the interface between the tube and the core processes. Usually, the tube is too ...
Bruno Chinè , Valerio Mussi , Michele Monno , Andrea Rossi ,
 School of Materials Science and Engineering, Costa Rica Institute of Technology, Cartago, Costa Rica
 Macchine Utensili e Sistemi di Produzione, Piacenza, Italy
 Dipartimento di Meccanica, Politecnico di Milano, Milano, Italy
Metal foams are interesting materials with many potential applications. Foamed metals or alloys include gas voids in the material structure and therefore the density is introduced as a new variable, with the real possibility to modify ad hoc their physical properties. In the indirect foaming process carried out in a furnace, simultaneous mass, momentum and energy transfer between three phases, ...
J. Blackburn , N. McCartney ,
 National Physical Laboratory, London, UK
We present computer simulation results for PEM fuel cells using COMSOL Multiphysics® software. We have developed novel PDE equations at NPL from first principles and these are more realistic than models typically used in literature. The theory includes Maxwell-Stephan and Nernst-Planck equations for the diffusion and electrochemistry as well as equations governing electrostatic and stress/strain ...
Department of Mechanical Engineering, University of Washington, Seattle, Washington, USA
A comparison of the commercial code COMSOL is performed with the bench-mark solutions provided by the literature for a tall, differentially heated rectangular cavity for aspect ratios of 8, 15, 20, and 33. At small Rayleigh numbers the flow is dominated by conduction. As the Rayleigh number is increased the flow becomes unstable, first resulting in multicellular secondary flow patterns, and then ...
TEL US Holdings, Inc., Technology Development Center, Albany, New York, USA
In this presentation we are dealing with the computational fluid model of a Filament Assisted Chemical Vapor Deposition (FACVD) reactor. Proposed strategy in this study involved several steps: (a) development a computational model for FACVD process capable to describe and obtain with reasonable accuracy all relevant phenomena occurring in the reaction chamber; (b) validation the computational ...
J.M. Gozálvez-Zafrilla, J.M. Serra, and A. Santafé-Moros
Chemical and Nuclear Engineering Depart., Universidad Politécnica de Valencia, Valencia, Spain
Instituto de Tecnología Química, Valencia, Spain
Oxygen transfer through ceramic membranes at high-temperature can substantially reduce costs respect to conventional separation methods. With the aim to improve the determination of the properties of the ceramic materials, a lab-scale permeation set-up was modeled using the Chemical Engineering Module of COMSOL Multiphysics®. The solution required the coupling of three domains. Gas flow was ...
A. Pujol, S. Pommier, G. Debenest, M. Quintard, and D. Chenu
Veolia Environnement, Limay, France
IMFT, Toulouse, France
INSA Toulouse, Toulouse, France
To understand origins and consequences of drying phenomenon during composting, a compositional drying model of a partially water-saturated porous media coupled with biodegradation has been developed. The different simulations carried out under COMSOL Multiphysics demonstrate the ability of the model to well describe the compositional drying of a partial water-saturated porous media and point out ...
AC Electroosmosis and Dielectrophoresis for Trapping Spherical Particles between Rectangular and Triangular Electrodes
S. Narayan, H. Francis, S. Ghonge, D.N. Prasad, A. Sethi, S. Banerjee, S. Kapur
Department of Physics, Birla Institute of Technology and Science, Pilani, Hyderabad Campus, Hyderabad, Andhra Pradesh, India
Department of Biological Sciences, Birla Institute of Technology and Science, Pilani, Hyderabad Campus, Hyderabad, Andhra Pradesh, India
We describe methods and results of simulations done for predicting behavior of particles in an aqueous solution under an applied AC electric field on electrodes of rectangular and triangular shapes. Here the two major effects which come into play are Dielectrophoresis and AC Electroosmosis. Two simulations have been presented, one for rectangular and one for triangular shaped electrodes. We have ...
R. Samso, N. Forquet, P. Molle, J. Garcia
Department of Hydraulic, Maritime and Environmental Engineering, Universitat Politècnica de Catalunya-BarcelonaTech, Barcelona, Spain
IRSTEA, Freshwater Systems, Ecology and Pollution Research Unit, Villeurbanne, France
Horizontal-Flow Constructed Wetlands (HFCWs) are a particular type of biofilter, and as such they rely mostly on the activity of bacterial communities to treat wastewater. Bacterial growth in HFCWs induces dramatic changes in its hydraulic and hydrodynamic behaviour (bioclogging), which may eventually result in overland flow of wastewater. Consequently, clogging is the main cause of premature ...
A. Atta , S. Dwivedi , Vivek , R. Mukherjee ,
 Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, India
Interfacial structures/pattern, especially with small-scale dimensions, are important to the chemistry of materials in determining the optical, electrical, mechanical, or other physical properties of novel materials. Polymers are often used for surface patterning. The diversity, the relatively low cost, the convenient mechanical properties and the compatibility with most patterning techniques ...