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.

A Study of Thermo-Fluid Behavior in Tubular Metal Hydride Beds in the Hydriding Process

S. Makridis[1], E.I. Gkanas[1], A. Ioannidou[2], E.S. Kikkinides[2], A.K. Stubos[3]
[1]Department of Mechanical Engineering, University of Western Macedonia, Kozani, Greece & Environmental Research Laboratory, Institute of Nuclear Technology and Radiation Protection, NCSR “Demokritos”, Athens, Greece
[2]Department of Mechanical Engineering, University of Western Macedonia, Kozani, Greece
[3]Environmental Research Laboratory, Institute of Nuclear Technology and Radiation Protection, NCSR “Demokritos”, Athens, Greece

Hydrogen, the most abundant element in the universe, has great potential as an energy source, and can be generated from renewable energy sources. We used COMSOL for the solution of the energy, mass and momentum balance equations that describe the hydrogen absorption and desorption procedure in the metal hydride compressor. Thermodynamic or engineering properties like the reaction enthalpy ??, ...

Sulfur Deactivation Effects on Catalytic Steam Reforming of Methane Produced by Biomass Gasification

P. Sadooghi[1], R. Rauch[1]
[1]Vienna University of Technology, Vienna, Austria

Sulfur, which is incorporated in the biomass structure, is released into the product gas during gasification as hydrogen sulfide. Hydrogen sulfide is known to deactivate nickel based steam reforming catalysts by chemisorption on the metal surface during steam reforming process. Desulfurization has a negative effect on the process efficiency therefore steam reforming has to be run without ...

Numerical Simulation of pH-sensitive Hydrogel Response in Different Conditions

M.K. Ghantasala[1], B.O. Asimba[1], A. Khaminwa[1], K.J. Suthar[2], D.C. Mancini[3]
[1]Department of Mechanical and Aeronautical Engineering, Western Michigan University, Kalamazoo, MI, USA
[2]Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA
[3]Physical Sciences and Engineering, Argonne National Laboratory, Argonne, IL, USA

The understanding of pH-sensitive hydrogel swelling response in different buffer environmental condition is essential for its use in different practical applications. This necessitates its simulation in steady state and transient conditions. This paper mainly deals with the details of the numerical simulation performed by developing coupled formulation of chemo-electro-mechanical behavior of ...

Finite Element Analysis of Induced Electroosmotic Flow in Brain Tissue and Application to ex vivo Determination of Enzyme Activity

Y. Ou[1], A. Rupert[1], M. Sandberg[2], S. Weber[1]
[1]University of Pittsburgh, Pittsburgh, PA, USA
[2]University of Gothenburg, Gothenburg, Sweden

Ectopeptidases are commonly accepted to be a means of clearing active peptides. However, studies have shown that they can also regulate peptide activity. We have developed a technique of electrokinetic push-pull perfusion (Ek-PPP, Figure 1) to examine this largely unexplored mechanism of modulation of peptide function. We push the neuropeptide galanin through organotypic hippocampal slice ...

Design and Simulation of Sensors to Detect Methanol

C. K. Subramaniam[1], Muthuraja[1]
[1]School of Electronics Engineering, VIT University, Vellore, Tamil Nadu, India

The Direct Methanol Fuel Cell (DMFC) working is dependent on the concentration of methanol in water before it is introduced in the anode. DMFC has a high energy density when generating electrical power from fuel, and is an attractive power source for portable devices. A fundamental limitation in DMFC technology is methanol crossover. In this process methanol diffuses from the anode through the ...

Singlet Oxygen Modeling for PDT Incorporating Local Vascular Oxygen Diffusion

T. C. Zhu[1], B. Liu[1]
[1]University of Pennsylvania, Philadelphia, PA, USA

Singlet oxygen (1O2) is the major cytotoxic agent that kills cells during photodynamic therapy (PDT). Based on a previously-developed model, the distance-dependent reacted 1O2 can be numerically calculated using finite-element method. We improved the model to include microscopic kinetic equations of oxygen diffusion from uniformly distributed blood vessels to the adjacent tissue. The blood ...

Numerical Model for Leaching and Transporting Behavior of Radiocesium in MSW Landfill

H. Ishimori[1], K. Endo[2], H. Sakanakura[2], M. Yamada[2], M. Osako[2]
[1]Ritsumeikan University, Kusatsu, Shiga, Japan
[2]National Institute for Environmental Studies, Tsukuba, Ibaraki Prefecture, Japan

This paper presents the numerical simulation model for radiocesium leaching and transporting behavior in municipal solid waste (MSW) landfill and discusses on the design for the required geometry and properties of the impermeable final cover and the soil sorption layer, which work for containment of hazardous waste such as radiocesium-contaminated MSW generated by Fukushima Daiichi nuclear ...

Optimization of Around-The-End Hydraulic Mixer Using COMSOL Multiphysics®

S. Mohammadighavam[1], B. Kløve[1]
[1]University of Oulu, Department of Process and Environmental Engineering ,Oulu, Finland

After rapid mixing of waste water and coagulant, an effective slow mixing during a reasonable retention time will cause to grow the size of flocs up which will settle out easily. Around-the-end hydraulic mixer with barriers is one of the efficient facilities that have been used in water treatment plants for this purpose. A uniform velocity gradient (G) is needed to achieve efficient mixing and ...

Modeling of a Biogas Steam Reforming Reactor for Solid Oxide Fuel Cell Systems

F. Cipitì[1]
[1]CNR-ITAE, Institute of Advanced Technologies for Energy, Messina, Italy

A biogas steam reforming reactor has been developed in order to be integrated into a proof-of-concept SOFC system, able to operate with biogas produced in an industrial waste water treatment unit. A mathematical model, aimed at describing the performance of the reactor, has been developed. The reactor is simplified and modeled as a non-isothermal plug flow reactor. The reactor is fed with a ...

Simulation of Reactive Transport in Porous Media: A Benchmark for a COMSOL-PHREEQC-Interface

D. Müller[1], H. Francke[1], G. Blöcher[1], H. Shao[2]
[1]Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum GFZ, Potsdam, Brandenburg, Germany
[2]Helmholtz-Zentrum für Umweltforschung UFZ, Leipzig, Saxony, Germany

The reactive transport simulation interface COMSOL-PHREEQC, developed by Wissmeier & Barry (2011), provides a MATLAB®-based coupling interface to combine COMSOL Multiphysics® for flow and heat transport simulations and PHREEQC as a geochemical batch reaction simulator. The functionality of the coupling tool is tested using the “calcite” example (Shao et al. 2010) as a benchmark. The results of ...