In questa sezione troverete i lavori presentati alle Conferenze mondiali COMSOL. Le presentazioni descrivono ricerche e prodotti innovativi progettati con COMSOL Multiphysics da colleghi di tutto il mondo. I temi delle ricerche presentate abbracciano un'ampia gamma di settori produttivi e aree applicative, in ambito elettrico, meccanico, fluidodinamico e chimico. Lo strumento di Ricerca Rapida vi permetterà di trovare le presentazioni che si riferiscono all'area di vostro interesse.

Numerical Modeling and Performance Optimization Study of a Dehumidification Process in Nuclear Waste Storage

P. Geraldini[1]
[1]Sogin Spa, Rome, Italy

One of the main parameters to consider during the nuclear waste storage design phase is the drum corrosion risk. The humid-air corrosion models available in literature predict that, for carbon steel, the phenomena start to become appreciable for relative humidity (RH) values close to 65%. In general, the corrosion rate increases exponentially with relative humidity above the RH threshold. To ...

Numerical Investigation for the Effect of Guide Panel on Heat Transfer from Steel Containment

Priyanshu Goyal[1], I. Thangamani[1], V. Verma[1], V.M. Shanware[1], R. K. Singh[1]
[1]Bhabha Atomic Research Centre, Mumbai, India

In a nuclear reactor, the containment is the last barrier for the release of radioactivity during severe accident conditions. Containment material can be concrete or steel or steel-lined concrete. Steel containments have a high load bearing capacity and a high degree of leak tightness at higher pressures. In case of a severe accident, heat can be removed from the containment by a guide panel, ...

Simulation of Flow in a Rectangular Channel of a PEM Fuel Cell

A. L. R. Paulino [1], E. Robalinho [2], E. F. Cunha [1], M. Linardi [1], R. R. Passos [3], E. I. Santiago [1]
[1] Instituto de Pesquisas Energéticas e Nucleares – IPEN/CNEN, São Paulo, SP, Brazil
[2] Instituto de Pesquisas Energéticas e Nucleares – IPEN/CNEN, São Paulo, SP, Brazil; and Instituto Federal do Rio Grande do Sul – IFRS, Porto Alegre, RS, Brazil
[3] Universidade Federal do Amazonas – UFAM, Manaus, AM, Brazil

The performance of a PEMFC depends on several factors, including the flow inside gas channels. Low gas velocity inside the channel can make water management more difficult, possibly causing water to accumulate and condense in certain regions of the cell. In the present work, COMSOL Multiphysics software was used to visualize and describe gas flow inside the channel of a PEMFC operating with ...

A COMSOL Multiphysics® Software Analysis of Beam Tube Cooling in the High Flux Isotope Reactor of ORNL

J. D. Freels [1],
[1] Research Reactors Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

Previous to the present work, a formal calculation was approved [1,2] to support the operation of the High Flux Isotope Reactor (HFIR) Horizontal Beam-Tube 1 of 4 (HB-1). The present calculation [3,4] repeats the previous work using COMSOL Multiphysics® software and extends the analysis to cover a broader range of coolant flow. In addition, this new calculation expands the analysis much further ...

Analysis of Lubricant Flow Through Reynolds Equation

K.C. Koppenhoefer[1], S.Y. Yushanov[1], L.T. Gritter[1], J.S. Crompton[1], and R.O. Edwards[2]
[1]AltaSim Technologies LLC, Columbus, OH, USA
[2]Cummins Fuel Systems, Columbus, IN, USA

Reynolds equation is used to analyze fluid flow through small gaps. As such, the solution of Reynolds equation provides critical information for a wide range of tribological problems. In any case where a lubricant resides between two moving surfaces, the Reynolds equation can be used to solve for the flow. In the case considered in this paper, lubricant flows between a piston and housing forced ...

Numerical Study and Simulation in COMSOL Multiphysics of the Dilution Process during Dust Sampling in Dry Machining

B. Wenga-Ntcheping[1], A. Djebara[1], R. Kamguem[1], J. Kouam[1], V. Songmene[1]
[1]University of Quebec-École de Technologie Supérieure, Montreal, Canada

Dilution’s issue during dry machining have raised the interest’s environmental researchers and engineers. In fact, the sampling of dust emitted during dry machining was a serious problem for air quality evaluation at the workplace. Furthermore, the best sampling of fine and ultrafine particles produced during material cutting, passed through the dilution of high particle concentration (number, ...

Pore-Scale Simulation of Two-Phase Flow with Heat Transfer Through Dual-Permeability Porous Medium

H.A. Akhlaghi Amiri[1], A.A. Hamouda[1]
[1]University of Stavanger, Stavanger, Rogaland, Norway

This paper addresses one of the major challenges in water-flooded oil reservoirs, which is early water breakthrough due to the presence of high permeable layers in the media. COMSOL Multiphysics is used to model two phase (water and oil) flow in dual-permeability porous medium at micro-scales. The heat transfer module is coupled with the laminar two-phase flow interface, because temperature ...

Effects of Forced Airflow Cooling on Laser Beam Heating of Volume Bragg Gratings

S. Kaim[1], B. Anderson[1], G. Venus[1], J. Lumeau[1], V. Smirnov[2], B. Zeldovich[1], L. Glebov[1]
[1]CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, FL, USA
[2]OptiGrate Corp, Oviedo, FL, USA

Forced airflow cooling of a Volume Bragg Grating heated by a laser beam was investigated by means of simulation with COMSOL Multiphysics®. In addition to air cooling of unrestricted airflow, a case of airflow directed by limiting glass plates was investigated. A number of temperature distributions and thermal deformations were obtained in simulations for different rates of airflows. Simulations ...

Boundary conditions in multiphase, porous media, transport models of thermal processes with rapid evaporation

A. Datta[1], and A. Halder[1]
[1]Biological and Environmental Engineering, Cornell University, Ithaca, New York, USA

In modeling of thermal processing of biological materials with rapid evaporation, it is critical to provide boundary conditions consistent with the phenomena happening at the surface to accurately predict spatial temperature and moisture content for quality and safety assurance. Boundary conditions in a mathematical model are as important as governing equations itself and describe how the heat ...

Multiphysics: Fluid Mixing and Brine Pool Formation for Economic Geology Applications - new

C. Schardt[1]
[1]University of Minnesota-Duluth, Duluth, MN, USA

Significant submarine mineral deposits form when hot, metal-laden, saline fluids emerge onto the seafloor and mix with ambient seawater. Resulting density changes of fluid mixtures can trigger fluid buoyancy reversals, brine pool formation, and metal accumulation (Figure 1). While some of these processes are known from experiments, the inception, development, and physical-chemical processes ...