Articles techniques et présentations

Ici vous trouverez les présentations issues des Conférences COMSOL à travers le monde. Réalisées par des utilisateurs de COMSOL Multiphysics, ces présentations explorent tous les domaines actuels d'innovation. Les applications couvrent pratiquement tous les secteurs industriels et impliquent des phénomènes électriques, mécaniques, fluidiques et chimiques. Utilisez la recherche rapide pour trouver les présentations les plus intéressantes dans votre domaine d'intérêt.

Finite Element Solution of Nonlinear Transient Rock Damage with Application in Geomechanics of Oil and Gas Reservoirs

S. Enayatpour[1], T. Patzek[1]
[1]The University of Texas at Austin, Austin, TX, USA

The increasing energy demand calls for advances in technology which translate into more accurate and complex simulations of physical problems. Understanding the rock damage is essential to understanding the geomechanics of hydrocarbon reservoirs. The fragile microstructure of some rocks makes it difficult to predict the propagation of fracture in these rocks, therefore a mathematical model is ...

Computational Fluid Dynamics for Microreactors Used in Catalytic Oxidation of Propane

S. Odiba[1], M. Olea[1], S. Hodgson[1], A. Adgar[1]
[1]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 ...

H2SO4 Catalysis: Perspective and Opportunities for Reducing SO2 Emissions - new

P. L. Mills[1], A. Nagaraj[2]
[1]Department of Chemical & Natural Gas Engineering, Texas A&M University, Kingsville, TX, USA
[2]Department of Environmental Engineering, Texas A&M University, Kingsville, TX, USA

Introduction: Development of next-generation chemical processes that have zero emissions is a key environmental objective for sustainable development. The manufacture of H2SO4 by the air oxidation of SO2 to SO3 is an important technology where an opportunity exists for new catalyst development and process innovation by reducing emissions of unconverted SO2 in process reactor tail gases owing to ...

Providing an Entry Length in Heterogeneous Catalytic Reactors with Fast Diffusion

D. Dalle Nogare[1] and P. Canu[1]

[1]Department of Chemical Engineering Principles and Practice, University of Padova, Padova, Italy

This work investigates the effects of boundary conditions on the species profiles in heterogeneous catalysis, with low Péclet systems. Hydrogen combustion in Helium was chosen because of the high diffusivities. Furthermore, already at T=300°C over a Pt catalyst, kinetics is very fast and the composition gradients at the inlet extremely steep. The issue is analyzed with 1D models, ...

Transport Phenomena and Shrinkage Modeling During Convective Drying of Vegetables

S. Curcio[1] and M. Aversa[1]
[1]Department of Engineering Modeling, University of Calabria, Arcavacata di Rende, CS, Italy

The aim of the present work is the formulation of a theoretical model describing the transport phenomena involved in food drying process. The attention has been focused on the simultaneous transfer of momentum, heat and mass occurring in a convective drier where hot dry air flows, in turbulent conditions, around the food sample. The proposed model does not rely on the specification of interfacial ...

The use of CFD Modeling to Determine the Influence of Residence Time Distribution on the Disinfection of Drinking Water in Ozone Contactors

J. Hofman1,2,3, D. Wind1, B. Wols3, W. Uijttewaal3, H. van Dijk3, and G. Stelling3
1Waternet, Amsterdam, The Netherlands
2Kiwa Water Research, Rijswijk, The Netherlands
3Delft University of Technology, Delft, The Netherlands

Disinfection is one of the most important aspects of drinking water treatment and is directly related to public health.Waternet uses ozone treatment as a main disinfection for drinking water production. Residence time distribution (RTD) in the ozone contactor has a large influence on the disinfection performance of the system. To get more insight into the effect of RTD, a multiphysics model was ...

Catalytic Pellet Based Heterocatalytic Reactor Bed Models Development

G. Rádi, T. Varga, and T. Chován
University of Pannonia, Veszprem, Hungary

Nowadays mathematical models are applied in almost every field of our life to predict how real systems behave. Computational Fluid Dynamics (CFD) has become a standard tool for analyzing various situations where fluid flow has a significant effect on the studied processes. Complex models can be implemented and solved in commercial CFD packages (e.g. COMSOL Multiphysics). The goal of this paper is ...

Finite Element Modeling of Freezing of Coffee Solution

C. Anandharamakrishnan, R. Gopirajah, and N. Chhanwal
Central Food Technological Research Institute
Mysore
Karnataka, India

Freeze-drying is a popular method of producing shelf stable particulate products and is of particular value for drying thermally sensitive materials (volatiles and biological based), which can be heat damaged by higher temperature methods, such as spray-drying. Porous structures are formed by the creation of ice crystals during the freezing stage, which subsequently sublime during the drying ...

Modeling of Non-Equilibrium Effects in the Gravity Driven Countercurrent Imbibition

M. Chahardowli[1], R. Farajzadeh[1], J. Bruining[1]
[1]Department of Geotechnology, Delft University of Technology, Delft, The Netherlands

One of the main mechanisms in the secondary oil migration from the source rock into oil traps is gravity driven countercurrent imbibition. Many mathematical models describe countercurrent imbibition considering local equilibrium. However, Barenblatt proposed a model to describe the effect of non-equilibrium in oil water displacement. Here, the proposed model was implemented in a gravity driven ...

Comparison of Heat and Mass Transport at the Micro-Scale

E. Holzbecher[1], S. Oehlmann[1]
[1]Georg-August Universität Göttingen, Göttingen, Germany

Phenomena of heat and mass transfer are often compared, in various porous media applications. Questions of practical interest are, for example, if tracers can be used for the prediction of heat flow, or vice versa if heat can be utilized as, possibly retarded, tracer for predicting the migration of contaminants, nutrients or other substances. Using numerical modelling in artificial porous media ...

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