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Numerical Simulation of Flow Electrolysers: Effect of Various Geometric Parameters

P. Shukla[1], K. K. Singh[1], P. K. Gupta [1], S. K. Ghosh[1]
[1]Bhabha Atomic Research Centre, Trombay, Mumbai, India

Flow electrolysers find several applications in industry. They are used for production of metals and synthesis of chemicals, gases. Cleaning and preservation of old artifacts, electrolytic refining of metals, electrolytic winning of metals, alkaline water electrolysis, anodization, electrometallurgy, electroplating, electrolytic etching of metal surfaces are other industrial applications of flow ...

Advancements in Carbon Dioxide and Water Vapor Separations Using COMSOL Multiphysics®

J. Knox[1], R. Coker[1], R. Cummings[1], C. Gomez[1], G. Schunk[1]
[1]NASA, Marshall Space Flight Center, Huntsville, AL, USA

Some NASA efforts are focused on improving current systems that utilize fixed beds of sorbent pellets by evaluating structured sorbents, seeking more robust pelletized sorbents, and examining alternate bed configurations to improve system efficiency and reliability. For the bulk separation of CO2 and H2O, temperature changes due to the heat of adsorption are significant, requiring modeling and ...

Studies on Electrostatic Field of a Resistive Plate Chamber

A. Jash[1], N. Majumdar[1], S. Mukhopadhyay[1], S. Chattopadhyay[4]
[1]Saha Institute of Nuclear Physics, Kolkata, West Bengal, India
[4]Variable Energy Cyclotron Centre, Kolkata, West Bengal, India

Resistive plate chambers (RPC) are fast gaseous detectors, having a simple design and construction, good time resolution and high efficiency. These are extensively used in high energy physics experiments. A large number of RPCs will be used as the main detector element for India’s mega science project, India Based Neutrino Observatory (INO). So, detailed study of this detector is very crucial ...

Análise da Aproximação para Baixa Absorção Óptica na Geração de Calor Via Laser em Sólidos Semitransparentes: Aplicação na Técnica de Lente Térmica - new

L. S. Herculano[1], G. V. B. Lukasievicz[2], O. A. Capeloto[3]
[1]Universidade Tecnológica Federal do Paraná, Santa Helena, PR, Brasil
[2]Universidade Tecnológica Federal do Paraná, Toledo, PR, Brasil
[3]Universidade Estadual de Maringá, Maringá, PR, Brasil

Neste trabalho utilizamos o software COMSOL Multiphysics® para resolver a equação de difusão de calor induzida por laser. Está equação é a base de técnicas fototérmicas em especial a técnica de Lente Térmica. Além de resolver a equação de difusão sem o uso das aproximações de amostra radialmente infinita e baixa absorção óptica, o COMSOL Multiphysics mostra-se como uma poderosa ferramenta no ...

Computational Multiphysics to Optimize Humidification Chamber for a Novel PEM Fuel Cell Power System Used in Automobile Application - new

M. Raja[1]
[1]Tata Motors, Bengaluru, Karnataka, India

Proton Exchange Membrane (PEM) fuel cells are quickly becoming an attractive technology due to their ability to meet increasing energy demands in a cleaner, more efficient way compared to existing methods. A fuel cell is an electrochemical device which converts the chemical energy of a fuel and an oxidant directly into electricity without the intermediate step of classical, chemical combustion ...

Modeling and Simulation of Pressure Seals - new

R. P. Ruby[1], G. Kulkarni[1], U. Kanade[1]
[1]Noumenon Multiphysics Pvt. Ltd., Pune, Maharashtra, India

Seals leak primarily at the interface between seal and cavity (Figure 1). At a microscopic level, the interface between the seal and cavity consists of regions of contact between the two elements, and voids. The voids are connected to each other, forming a microscopic system of caverns through which the leaking fluid flows (Figure 2). In two previous papers, we investigated the microgeometry of ...

Numerical Investigation of Electroosmotic Flow in Convergent Divergent Micronozzle

V. Gnanaraj[1], V. Mohan[1], and B. Vellaikannan[1]
[1]Thiagarajar College of Engineering, Madurai, Tamilnadu, India

A fundamental understanding of the transport phenomena in microfluidic channels is critical for systematic design and precise control of such miniaturized devices towards the integration and automation of Lab-on- a-chip devices. Electroosmotic flow is widely used to transport and mix fluids in microfluidic systems. Electroosmotic transport in convergent divergent micronozzle is significant in ...

COMSOL Multiphysics® Version 4

Svante Littmarck
President and CEO, COMSOL

Svante Littmarck is the CEO of the COMSOL group. He co-founded COMSOL in 1986. He holds a M.Sc. in Applied Mathematics from the Royal Institute of Technology in Stockholm. In 2004 he received an honorary doctoral degree from the Royal Institute of Technology.

Towards a Finite Element Calculation of Acoustical Amplitudes in HID Lamps

B. Baumann[1], M. Wolff[1], J. Hirsch[2], P. Antonis[2], S. Bhosle[3], and R. Valdivia Barrientos[4]
[1]Hamburg University of Applied Sciences, Hamburg, Germany
[2]Philips Lighting, Eindhoven, The Netherlands
[3]LAPLACE, Université de Toulouse and CNRS, Toulouse, France
[4]National Institute of Nuclear Research, Salazar, Ocoyoacac, Mexico

High intensity discharge lamps can experience flickering and even destruction, when operated at high frequency alternating current. The cause of these problems has been identified as acoustic resonances inside the lamp’s are tube. Here, a finite element approach for the calculation of the acoustic response function is described. The developed model does not include the plasma dynamics.

The Effect of a Correlated Surface Roughness and Convection on Heat Conduction

A.F. Emery[1]
[1]Department of Mechanical Engineering, University of Washington, Seattle, Washington, USA

Heat conduction through a slab, 0 ≤ x ≤ W is one dimensional. However, if one of the edges, say x=0, is rough the conduction will be two dimensional. The two dimensionality varies with the correlation length with a maximum at a length approximately 10% of the slab width. The maximum percentage standard deviation of the flux is of the order of 3 time that of the roughness. Monte ...

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