A. Nardi, L. M. de Vries, P. Trinchero, A. Enrique Idiart , J. Molinero
Amphos 21, Barcelona, Spain
Phreeqc is a program for simulating chemical reactions and 1D transport processes in aqueous systems. Several couplings between conservative transport codes and PHREEQC already exist. The methodology used here is based on the operator splitting concept: the transport of the aqueous components and the chemical reactions are solved in two different steps. The Java interface uses the COMSOL Java ...
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 ...
U. N. Mughal, M. S. Virk
Narvik University College, Narvik, Norway
Atmospheric ice is a very complex material with varying electrical properties due to different polymorphs of ice itself. Also, if the medium to be considered is snow, then density becomes an additional parameter because it is a mixture of three dielectrics water, ice and air. The permittivity and loss tangent of naturally occurring ice and snow shows lot of variation at different conditions ...
A. Ivanov, U. Mescheder
Furtwangen University, Furtwangen, Germany
In the presented work the dynamic simulation of a silicon anodization process is performed. Two mechanisms of etch form development (diffusion in electrolyte, current flow) are considered and simulated. Influence of electrolyte conductivity and radius of the opening in the masking layer is discussed.
B. Hari, S. Bakalis, P. Fryer
The University of Birmingham, School of Chemical Engineering, Edgbaston, Birmingham, United Kingdom
Worldwide attention in the computational modeling and simulation of the human intestine is increasing in order to help understand its complex behavior and improve health. Computational fluid dynamics is an essential tool to understand the mechanics and transport phenomena of the human intestine, thereby advancing the diagnosis and treatment of gastrointestinal related diseases. The aim of this ...
ABB, Corporate Research, Västerås, Sweden
Modern power transmission systems are in general designed to operate at high voltages in order to reduce resistive losses generated by high currents. This, however, tends to increase the risk for dielectric breakdown or flashovers if the equipment is not properly designed to withstand the stress. The present work illustrates how multiphysics simulations can be used to analyze and predict the ...
G. Petrone, G. Cammarata
Department of Industrial Engineering, University of Catania, Catania, Italy
This study deals with a numerical investigation of the melting process of a PCM in a rectangular enclosure differentially heated. COMSOL Multiphysics is used in order to numerically solve Navier-Stokes and energy equations in the considered system. Adopting an enthalpy formulation, one single equation is used to solve transient conduction and convection heat transfer in both the solid and liquid ...
S. Sandoval Torres, A. de Lourdes Allier González, L.L. Méndez Lagunas
Instituto Politécnico Nacional, CIIDIR, Oaxaca, Mexico
In this work we solve a model to simulate the drying of potatoes slices. The model considers both the transport of free and vapor water by applying a mechanistic approach. The critical moisture point (CMP) was considered, since it is a transition zone and it represents the point where water saturation is near from cero and hygroscopic domain begins. The CMP divides the hygroscopic and non ...
Keyhole Formation During Spot Laser Welding: Heat and Fluid Flow Modeling in a 2D Axisymmetric Configuration
M. Courtois, M. Carin, P. LeMasson, S. Gaied 
ArcelorMittal, Global R&D, Montataire, France
LIMATB Laboratory, Université de Bretagne Sud, Lorient, France
For a better understanding of phenomena associated to the appearance of defects in laser welding, a heat and fluid flow model is developed. This study is focused on the modeling of a static laser shot on a sample of steel. This 2D axialsymmetric configuration is used to study phenomena related to the creation of the keyhole. This model takes into account the three phases of the matter: the ...
G. Campa, E. Cosatto, S. Camporeale
Politecnico di Bari, Bari, Italy
Ansaldo Energia, Genova, Italy
A hybrid technique based on the use of the FEM and the transfer matrix method is used to identify the frequencies at which thermoacoustic instabilities are expected and the growth rate of the pressure oscillations at the onset of instability. The Helmholtz equation is used to model the combustion chamber and the classical ?-? formulation for the flame model is adopted. The gas turbine combustion ...