V. Nicolas, C. Doursat, D. Grenier, T. Lucas, D. Flick
Institut de recherche en sciences et technologies pour l'environnement et l'agriculture, Rennes, France
AgroParisTech, UMR1145 Ingénierie Procédés Aliments, Massy, France
Bread is a food product which various complex physico-chemical phenomena occur during the cooking process. Thus, phenomena of heat and mass transfer are coupled to the deformation. In addition, bread is a multiphase product (solid, liquid and vapor) and composed of various components (dry matter, water, air and carbon dioxide). A 2D model is developed with COMSOL Multiphysics® 4.3b witch ...
M. Divakaran, S. K. Gupta
Department of Chemical Engineering, Indian Institute of Science, Bangalore, Karnataka, India
Due to the coupling of foam flow with foam generation step, the earlier studies on foam flow have not led to consistent results. An increase in flow rate to obtain ?P vs. Q data changes the foam under investigation itself. The controlled experiments carried out earlier in our group show that ?P increases with flow rate as Q^2/3, a weaker dependence than that known for laminar flow or plug flow ...
D. Yuryev, M. Demkowicz 
Massachusetts Institute of Technology, Cambridge, MA, USA
We describe simulations performed in COMSOL Multiphysics® of the precipitation of helium (He) on solid-state interfaces. The non-uniform precipitation of He at certain interfaces is a result of a heterogeneous energy distribution in the interface plane: He wets high interface energy (“heliophilic”) regions but does not wet low interface energy (“heliophobic”) ones. Using a phase-field ...
C. Wylock, A. Rednikov, B. Haut, P. Colinet
Université Libre de Bruxelles (ULB), Transfers, Interfaces and Processes (TIPs), Brussels, Belgium
This work deals with the modeling and the numerical simulation of the CO2 absorption, coupled with a chemical reaction, in an initially quiescent aqueous solution of sodium carbonate (Na2CO3) and bicarbonate (NaHCO3), inside a Hele-Shaw cell. In our Hele-Shaw cell, the liquid fills partially the gap between two parallel transparent Plexiglas plates. CO2 is forced to flow above the liquid in the ...
Numerical modeling of coupled heat and mass transport during frying and cooling of wood in contact with oil
Grenier, D.1, 2, Bohuon, P.1, 3, Baillière, H.1, Ben Lalli, A., Méot, J.M.1
1 CIRAD, Montpellier cedex, France
2 CTBA, Bordeaux cedex, France
3 ENSIA, 1101, Montpellier cedex, France
This paper proposes a model of coupled heat and mass (water, oil) transport in a porous medium (timber) soaked first in a hot oil bath, then in a cold oil bath. The timber is soaked at hot temperature to dry it (water vaporization, resulting in increased pressure and therefore vapor transport) and at cold temperature to treat it (vapor condensation, resulting in decreased pressure and oil ...
J.R. Puentes, T.A. Osswald, S. Schick, J. Berg
Polymer Engineering Center, University of Wisconsin, Madison, WI, USA
TEEL Plastics, Baraboo, WI, USA
The extrusion of polyolefin pipes suffers degradation due to mechanical design problems of the extrusion die that is commonly used. This study uses numerical and computational approaches to detect problematic areas in the die geometry. Simulations show that in the conventional die there are areas of stagnation and recirculation of the melt flow, resulting in greater residence times, one of the ...
N. Khoshnevis Gargar, A. Mailybaev, D. Marchesin, H. Bruining
 Delft University of Technology, Delft, The Netherlands
 Instituto Nacional de Matematica Pura e Aplicada, Rio de Janeiro, Brazil
One of the methods to recover oil from medium and low viscosity in complex reservoirs uses air injection leading to oil combustion. In this case the oxygen in the air burns the heavier components of the oil, generating a heat wave leading to vaporization of lighter components. The combustion mechanisms are different for light oils, where evaporation is dominant, whereas for medium non-volatile ...
COMSOL Modelling of the Gas Mixing Process in a Ripple Reducer for NPL’s Time Division Dilution System
J. Wang, B.A. Goody, and M.J.T. Milton
National Physical Laboratory, Teddington, Middlesex, UK
The mixing process of a ripple reducer designed for a time division dilution system (TDD) that dynamically generates calibration gas mixtures is modelled in 2D using COMSOL Multiphysics. The model can been used to visualize and optimize the mixing process and extract parameters of interest at chosen times and positions. The simulated time response of an analyte concentration agrees with ...
M. Beckmann-Kluge, F. Ferrero, V. Schröder, A. Acikalin, and J. Steinbach
Federal Institute for Materials Research and Testing, Technical University, Berlin, Germany
Tetrafluoroethylene (TFE) is a gas widely employed in industry, which can under specific circumstances experience an exothermic dimerization to octafluorocyclobutane. If the heat generated by this reaction cannot be dissipated to the surroundings, the temperature inside the reactor will continue rising, leading to conditions where TFE can decompose in tetrafluoromethane and carbon black. This ...
M. Quast and N.R. Lalic
Gunytronic GmbH, St Valentin, Germany
The sensor type developed by Gunytronic uses corona discharge for measuring flow rates in exhaust streams of automotives, aircrafts and industrial plants. This paper will present the development of testing equipment used in laboratory for investigating physical relations on corona currents, charged particle transport, the calculation of the collateral electric fields and high potentials. This ...