M. C. B. Kumar, D. B. Prabhu, R. Akila, A. Gupta, M. Alagappan
PSG College of Technology, Coimbatore, Tamil nadu, India
This paper discusses the simulation studies on a vibration based energy harvesting system to convert the undesirable mechanical vibration to useful green power. The design consists of a resonating proof mass and a spring system enclosed in housing and fixed on the source of vibration. A piezoelectric suspension acts as the transducer and generates a voltage that is used to charge the batteries ...
Computational Modelling of Fluid Dynamics in Electropolishing of Radiofrequency Accelerating Cavities - new
H. Rana, L. Ferreira
Loughborough University, Leicestershire, UK
European Organisation for Nuclear Research (CERN), Genéve, Switzerland
Electropolishing is an electrochemical process that radiofrequency accelerating cavities undergo in order to improve their inner metal surface finishing. This is performed prior to their installation into particle accelerators, in order to enhance their accelerating properties. Using COMSOL Multiphysics® software it was possible to model the process throughout the cavity and study the fluid ...
江智元 , 王琼 ,
引言 采用相变材料的汽车电池热管理技术已经被广泛研究，利用相变材料的相变潜热对电池进行温控，能有效降低电池高倍率工作条件下的电池温升，提高温度均匀性[1,2]。热管作为一种高导热，紧凑型，形式灵活的换热器件，也被用于电池热管理之中[3,4]。本文针对相变材料与热管相结合的换热结构，对该结构的换热特点，以及对影响该结构换热效果的相关参数进行了数值模拟研究。 COMSOL Multiphysics® 的使用 利用 COMSOL Multiphysics 中的电化学模块和传热模块，建立了二维的电池-热管-相变材料“三明治”结构（图1）。电池部分采用了热-电化学耦合的电池产热模型，热管采用了三层结构的烧结热管模型。 结果 对于耦合换热模块而言，热管冷端的散热情况和相变材料的厚度对模块的换热效果影响较大。如图2所示，电池的温度随着热管冷端换热系数的提高而下降，温度下降并非线性 ...
Current Density Simulations in the Electrodeposition from Ionic Liquids: Effects of the Conductivity
I. Perissi, C. Borri, S. Caporali, and A. Lavacchi
Department of Chemistry, University of Firenze, Sesto Fiorentino, FI, Italy
The overall goal of this work is the use of COMSOL Multiphysics® in the modeling of the current density distributions for the electrodeposition of aluminum coatings from ionic liquids. The local current distribution is strongly dependant on the conductivity and on the geometry of the galvanic cell and can only be computed by the numerical solution of the partial differential equations ...
P. R. Impinnisi , L. F. Siqueira ,
 Instituto Lactec, Curitiba, PR, Brasil
Foi desenvolvido um modelo 3D para simular descargas de eletrodos de baterias de chumbo-ácido. O modelo inclui a formação de filmes isolantes de sulfato de chumbo durante a descarga e permite visualizar a analisar a evolução da distribuição de linhas de corrente, os efeitos de bordas, os gradientes de concentração e outros fenômenos, nas regiões externas do eletrodo e no interior de poros.
Michael A. Vallance
Team Leader, GE Global Research
Over time, rechargeable batteries degrade and eventually stop working. You see some combination of declining capacity, rapid self-discharge, and reduced power. Degradation mode depends on battery design, but also on the application. Often, multiple physical processes contribute to degradation. In the laboratory, you can measure performance degradation. You can dissect the battery to discover ...
Transient Modelling of a Fluorine Electrolysis Cell; Fully Coupled Electric Currents, Heat-Transfer, Diluted Species Transport and Laminar Bubbly Flow
R. Pretorius, P. L. Crouse, and C. J. Hattingh
University of Pretoria, Pretoria, Gauteng, South Africa
Metallurgical Testing and Consultation (MTC) cc, Farrarmere, South Africa
A laboratory-scale fluorine reactor was simulated with COMSOL Multiphysics®. This model employs fundamental fully coupled electron-, heat-, mass- and momentum transfer (two-phase) equations to deliver a transient model of the above-mentioned reactor. Quasi-steady-state results were produced for the current density, electric field, temperature, reactive species concentration, gas- and liquid ...
G. C. Bandlamudi[1,2], C. Siegel, C. Heßke, and A. Heinzel[1,2]
ZBT Duisburg, Duisburg, Germany
University of Duisburg-Essen, Duisburg, Germany
High temperature polymer electrolyte membrane fuel cells (HT PEMFCs) are very promising technologies when used in combined cooling and heating power (CCHP) systems. They are operated at 160°C, offering the possibility of high tolerance to fuel impurities and a possibility to use the heat generated for cooling and heating purposes, leading to higher total system efficiency. Employing a 24 ...
J. Vukasin , I. Crassous , B. Morel , J. Sanchez-Marcano , P. Namy 
 HRP, AREVA NC, France
 Institut Européen des Membranes - CNRS, France
 Simtec, France
In the nuclear fuel cycle, fluorine is produced by the electrolysis of the molten salt KF-2HF. It is a complex process to study since hydrofluoric acid and fluorine are hazardous and highly corrosive. A 3D-model of a lab-scale fluorine electrolysis cell has been developed to increase our understanding of this process, using the electric currents and the bubbly flow interfaces to simulate the ...
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 ...