The Effect of Electrolyte Flow Slots in Tooling Electrodes on Workpiece Surface Finish in Electrochemical Machining
Oregon State University, Corvallis, OR, USA
Electrochemical machining (ECM) uses electrolysis to precisely remove material at high rates. ECM has many advantages over conventional machining: no tool wear, no induced mechanical or thermal stresses, high removal rates virtually independent of material hardness or strength, and excellent surface finishes. However, challenges can arise during the design of the tooling electrode when ...
Modeling of the Material/Electrolyte Interface and the Electrical Current Generated During the Pulse Electrochemical Machining of Grey Cast Iron
O. Weber, A. Rebschläger, P. Steuer, D. Bähre
Center for Mechatronics and Automatization, Saarbrücken, Germany
Institute of Production Engineering, Saarland University, Saarbrücken, Germany
The Pulse Electrochemical Machining is especially suitable for the precise production of complex geometric contours with high precision and high surface quality demands in series manufacturing. During this process, the negative structure of an electrode is copied to the workpiece without sub-surface damages. An adequate knowledge of the current and thus of the material removal behavior is ...
H. Machrafi[1,2], S. Cavadias
University of Liège, Thermodynamics of Irreversible Phenomena, Liège, Belgium
University Pierre et Marie Curie, Laboratoire des Procédés Plasma et Traitement de Surface, Paris, France
The purpose of this work is to show whether an important difference in Lithium solid concentration and electrolyte concentration can be observed in a Lithium-ion battery model, when considering either the Butler-Volmer kinetics or the Tafel kinetics for describing the electrode kinetics (including a boundary layer between the electrolyte and the electrode particles). During discharge, the lithium ...
Modeling of Liquid Water Distribution at Cathode Gas Flow Channels in Proton Exchange Membrane Fuel Cell – PEMFC
S. Skoda, E. Robalinho, A. Paulino, E.F. Cunha, M. Linardi
Instituto de Pesquisas Energéticas e Nucleares, São Paulo, Brazil
Universidade Nove de Julho, São Paulo, Brazil
The objective of this study is to determine the locations where liquid water accumulates at cathode gas flow channels, and the corresponding operating conditions. In such way it is possible to mitigate slug flow, responsible for channel blockage and hindering the diffusion of reactants to the catalytic sites. The model presented here is a comprehensive PEMFC 3D model, which includes liquid water ...
University of Trinidad and Tobago, Couva, Trinidad and Tobago
This paper presents a 2D model of an intermediate temperature ammonia-fed SOFC (400 – 700 °C) based on the Temkin-Pyzhev model of ammonia decomposition. Phenomenological equations are implemented in COMSOL Multiphysics®. The Dusty Gas Model is used to model species transport in porous media, but a modification of Fick’s Law is used. Results show that intermediate temperatures can alleviate ...
P. Alamar, J. Esarte
Fundación CETENA, Navarra, Spain
With a view to estimating electrical characteristics of a Polymer Li-ion Battery during specific charge and discharge conditions, a COMSOL Multiphysics® model has been developed that accounts for electrochemical phenomena inside the device. Cell model has been created using the Li-Ion Battery interface, customizing material properties and electrochemical reactions. The electrochemical parameters ...
J. Dujc, J.O. Schumacher
Zurich University of Applied Sciences (ZHAW), Institute of Computational Physics (ICP), Winterthur, Switzerland
A finite element model of a polymer electrolyte membrane fuel cell (PEMFC) is described in this paper. We divide the PEMFC into two separate and parallel 2D regions which are connected by the 1D regions representing the membrane electrode assembly (MEA). COMSOL Multiphysics® was used as a development tool for hierarchical 1D MEA models. Here we present a 1D model that is based on seven governing ...
Modeling Bioelectrochemical Systems for Waste Water Treatment and Bioenergy Recovery with COMSOL Multiphysics®
T. Oyetunde, D. Ofiteru, J. Rodriguez
Masdar Institute of Science and Technology, Abu Dhabi, United Arab Emirates
Most conventional wastewater treatment processes are quite energy-intensive. Global wastewater production is increasing due to growth in population, industrialization, and urbanization, creating an urgent need for energy-efficient wastewater treatment technologies. Moreover, waste streams (industrial and domestic) have drawn renewed interest as resources for water, energy, and product recovery. ...
A. Ivanov, U. Mescheder
Furtwangen University, Furtwangen, Germany
In the presented work the dynamic simulation of a silicon anodization process is performed. Two mechanisms of etch form development (diffusion in electrolyte, current flow) are considered and simulated. Influence of electrolyte conductivity and radius of the opening in the masking layer is discussed.
2D Axisymmetric Simulation of the Electrochemical Finishing of Micro Bores by Inverse Jet Electrochemical Machining
M. Hackert-Oschätzchen, M. Kowalick, G. Meichsner, A. Schubert, B. Hommel, F. Jähn, M. Scharrnbeck, R. Garn, A. Lenk
Professorship Micromanufacturing Technology, Technische Universität Chemnitz, Chemnitz, Germany
Fraunhofer Institute for Machine Tools and Forming Technology, Chemnitz, Germany
SITEC Industrietechnologie GmbH, Chemnitz, Germany
SITEC Automation GmbH, Chemnitz, Germany
Continental Automotive GmbH, Limbach-Oberfrohna, Germany
In this study the inverse Jet-ECM process of micro bores is investigated by help of multiphysics simulations. Based on the micro bore of a commercial sample nozzle a model geometry was derived. For simulating inverse Jet-ECM a transient model has been developed. Electric currents and deformed geometry interface were used. It could be demonstrated, that the maximal removal took place at the edge ...