N. M. Musa , D. Kuvshinov , P. Rubini ,
 The University of Hull, Hull, East Yorkshire, United Kingdom
Impact of human activities on the climate is evident, and the recent anthropogenic production and discharge of greenhouse gases into the atmosphere is highest in history. The current climate change have had worldwide influence on human and natural systems for example; global warming, melting of ice and snow, and rise in sea level etc. (AGECC 2010, Council 2013, IPCC, 2014). Increase in the ...
Modeling of Porous Catalyst Pellets: Comparison of Diffusion Flux Models for Steam Methane Reforming
P. L. Mills , L. Olabanji , A. Nagaraj , A. Nanduri ,
 Department of Chemical and Natural Gas Engineering, Texas A&M University - Kingsville, Kingsville, TX, USA
Introduction Steam reforming of natural gas has been the most common method for producing synthesis gas (CO + H2) for the production of H2, MeOH and NH3 for over half a century . Production of H2 in the USA using steam methane reforming (SMR) is ca. 9 MM tons/yr. Global production of NH3 using H2 derived from SMR was ca. 109 MM/yr in 2004. In the chemical industry, the SMR process is ...
T. Lohner , A. Ziegltrum , K. Stahl ,
 Gear Research Centre (FZG), Technical University of Munich (TUM), Garching, Germany
Thermal elastohydrodynamic lubricated (TEHL) contacts occur very frequently in drive technology and thus in gear drives. In this presentation, the implementation of a finite element based TEHL simulation approach for gear contacts in COMSOL Multiphysics® software is shown. The physically based simulation approach used is different to most of the existing TEHL simulations and is required to ...
V. S. Kshirsagar, P. M. Pawar
SVERI's College of Engineering, Pandharpur, Maharashtra, India
Effective suspension and settling are critical for controlling biomass retention in a biogas digester. This paper developed a Computational Fluid Dynamics (CFD) model to simulate the hydrodynamic characteristics of multiphase flow in biogas digester. This is carried out by using COMSOL Multiphysics® software for understanding the behavior of slurries of different viscosity. This study helps to ...
A. Levy ,
 Laboratoire de Thermocinétique de Nantes, Nantes, France
Crystallization phenomena are of first interest in several industrial applications (polymer forming processes, metallurgy, phase change flow, energy storage...). A classical way to model the crystallization evolution is using the Nakamura kinetics law. In this paper, a novel physics interface is developed using the Physics Builder of COMSOL Multiphysics® , which accounts for the resolution of ...
M. Karlsson , J. Yannie ,
 Chalmers University of Technology, Gothenburg, Sweden
In this work a modified anisotropic creep model with structure for soft soils was implemented by using the Physics Builder. The model is validated against boundary value laboratory test such as undrained tri-axial tests and CRS (constant rate of strain) tests. The implemented user-defined MAC-s constitutive model seems to capture many of the important behaviors seen in soft soils.
Stochastic Diffusion of Calcium Ions Through a Nanopore in the Cell Membrane Created by Electroporation - new
O. Henao, V. Gómez, I. De La Pava, J. Sánchez 
Grupo Fisiología Celular y Aplicada, Universidad Tecnológica de Pereira, Pereira, Risaralda, Colombia
We simulated the diffusion of calcium ions through a nanopore created in the cell membrane by electroporation, in presence and absence of the external electric field responsible of the membrane permeabilization. First we solved the set of coupled differential equations that describe the process of ionic diffusion in a 2D nanopore model using the AC/DC Module and the Transport of Diluted Species ...
Finite Element Analysis of Transient Ballistic-Diffusive Heat Transfer in Two-Dimensional Structures - new
S. Hamian, T. Yamada, M. Faghri, K. Park
University of Utah, Salt Lake City, UT, USA
Lund University, Lund, Sweden
University of Rhode Island, Kingston, RI, USA
For the last two centuries, the conventional Fourier heat conduction equation has been used for modeling a diffusive nature of macroscale heat conduction by considering the energy conservation and Fourier's linear approximation of heat flux. However, it cannot accurately predict heat transport when the length scale is comparable to or smaller than the mean free path of thermal energy carriers or ...
Estimation of Hydraulic Conductivity for a Heterogeneous Unsaturated Soil Using Electrical Resistivity and Level-Set Methods - new
T. K. Chou, M. Chouteau, J. S. Dubé
École Polytechnique de Montréal, Montréal, QC, Canada
École de Technologie Supérieure, Montréal, QC, Canada
The estimation of the soil saturated hydraulic conductivity (Ks) is crucial in understanding water flow and transport of contaminants. There are many hydrological techniques available in determining this parameter (constant head method, in-situ soil analysis, etc...). While these techniques can provide quality data points, they are often limited by sparse data sampling and scale. Therefore ...
M. Penzel , M. Hackert-Oschätzchen , M. Kreißig , M. Kowalick , M. Zinecker , A. Schubert , G. Meichsner ,
 Professorship Micromanufacturing Technology, Technische Universität Chemnitz, Chemnitz, Germany
 Professorship Micromanufacturing Technology, Technische Universität Chemnitz, Chemnitz, Germany; Fraunhofer Institute for Machine Tools and Forming Technology, Chemnitz, Germany
 Fraunhofer Institute for Machine Tools and Forming Technology, Chemnitz, Germany
Precise electrochemical machining (PEM) is a non-conventional machining technology, based on anodic dissolution of metallic work-pieces. In this study an additional extension of the precise electrochemical machining with a precise angle-controlled cylinder positioning is aimed. Due to the help of the angle-controlled cylinder positioning, with PEM e.g. stamping and extrusion dies can be ...