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Modeling of Charge Transport in Ion Bipolar Junction Transistors

A.V. Volkov[1], K. Tybrandt[1], I.V. Zozoulenko[1], M. Berggren[1]
[1]Organic Electronics, ITN, Linköping University, Norrköping, Sweden

Modeling of an ion bipolar junction transistor (IBJT) is performed using the COMSOL Multiphysics® software. Our model describes the IBJT which was developed and characterized [1]. The IBJT under consideration consists of an anion-selective collector and emitter, a cation-selective base and a neutral junction. The physical model is based on Poisson and Nernst-Planck (PNP) equations. A two ...

Melt Homogenization Improvement By Optimizing the Rotation Profile

J. Petit [1], V. Tabouret [1], B. Viana [2],
[1] ONERA, Chatillon, France
[2] IRCP/CNRS, Paris, France

During the last decades, mid-IR (3-12µm) laser sources have attracted attention due to their potential applications in different fields like infrared counter-measures (e.g: missile jamming) and remote chemical sensing. In this context, Onera has been working on the development of non-oxid materials and still is developing new crystals that allow to reach higher power and to extend the ...

Validation of a CFD Study of Particle Distribution in Nuclear Workplace

P. Geraldini [1],
[1] Sogin S. p. A., Rome, Italy

Understanding the air flow patterns and aerosol trajectories in ventilated rooms can provide key information for determining where to place early warning and monitoring instruments, and how to minimize hazardous materials in the worker’s breathing zone. The dispersion within rooms can be influenced by complex interactions between numerous variables, but especially ventilation design and room ...

COMSOL Multiphysics for Efficient Solution of a Transient Reaction-Diffusion System with Fast Reaction

M.K. Gobbert[1], A. Churchill[1], G. Wang[1], and T.I. Seidman[1]
[1]Department of Mathematics and Statistics, University of Maryland, Baltimore County, Baltimore, Maryland, USA

A reaction between chemical species is modeled by a particular reaction pathway, in which one reaction is very fast relative to the other one. The diffusion controlled reactions of these species together with a reaction intermediate are described by a system of three transient reaction diffusion equations over a two-dimensional spatial domain. In the asymptotic limit of the reaction parameter ...

Modeling Proton Transport in Hydrophobic Polymeric Electrolytes

M. Andrews[1]
[1]Caribbean Industrial Research Institute, Calibration Laboratory, University of the West Indies, St. Augustine, Trinidad and Tobago

The Polymer Electrolyte Membrane fuel cell is one of the most promising green technologies for addressing portable, as well as transportation power needs. However, the science behind the fuel cell, in many regards, is still an enigma, and even more so, with the vast numbers of novel materials created annually; designed to offset issues related to durability, conductivity, cost- effectiveness and ...

Modeling Flow and Deformation during Hot Air Puffing of Single Rice Kernels

T. Gulati[1], A. Datta[1]
[1]Cornell University, Ithaca, NY, USA

When rice is subjected to intense heating, it results in rapid evaporation of liquid water to vapor. As a consequence, large pressures are generated within the kernel in a span of 15s resulting in large volume changes causing the kernel to puff rapidly. Under suitable conditions, the ratio of initial volume to volume after puffing could be as high as 10. Rice puffing process is a complex ...

Network-of-Zones Model for Stirred Tank with Fractal Impeller - new

G.M. Mule[1], A.A. Kulkarni[1]
[1]CSIR - National Chemical Laboratory, Pune, Maharashtra, India

Stirred tanks are widely used in the pharmaceuticals, chemical and paint industries for variety of operations. The fractal impeller is an impeller having a novel design, developed by CSIR-National Chemical Laboratory, Pune, India. The power number of fractal impeller is relatively lower than the conventional impellers. The mixing performance is also relatively better than the conventional ...

Virtual Functional Product Development of a µ-Methane Steam Reformer

T. J. Kazdal [1], M. J. Hampe [1],
[1] Technische Universität Darmstadt, Darmstadt, Germany

A micro steam methane reformer is a complex product consisting of multiple units. For the virtual functional product development it is necessary to validate these sub models separately. Therefore a reactor was designed to analyse kinetics of chemical reactions. The reactor design is based on a simulation geometry and the boundary conditions of the simulation were recreated in the experimental ...

A COMSOL Multiphysics® Software Interface with GEMS3K for Modeling Reactive Transport (Geo)Chemical Processes

O. B. Isgor [1], V. J. Azad [1],
[1] Oregon State University, Corvallis, OR, USA

This paper presents a generic interface for reactive transport process modeling that was developed between the COMSOL Multiphysics® software Java API (transport model) and GEMS3K (reaction model). While the transport of different species, kinetics of dissolution/precipitation, system potentials, fluid and gas flow, etc. can be modeled in a complex chemical system with COMSOL® software, the ...

Computational Evaluation of Improved Anaerobic Digestion Reactor Designs

A. A. Forbis-Stokes [1], M. A. Deshusses [1],
[1] Duke University, Durham, NC, USA

The purpose of this study was to investigate the impact on number of baffles placed in horizontal- or vertical-alignment of an anaerobic baffled reactor (HABR and ABR, respectively). Computational fluid dynamics was used to evaluate hydraulic performance of each and determine what number of compartments should be used to optimize reactor volume while adding minimal complexity. The findings ...