J. Volkmann, O. Mohnke, N. Klitzsch, and R. Blaschek
E.ON Energy Research Center, RWTH-Aachen, Aachen, Germany
The frequency dependent electrical impedance of porous media is studied by modelling the charge transport in the electrolyte filled pore space using COMSOL Multiphysics. The corresponding experimental method, called Spectral Induced Polarization (or Impedance Spectroscopy), shows a frequency dependent phase shift between a measured electric current and an applied alternating voltage. It is ...
J.M. Gozálvez-Zafrilla, J.M. Serra, and A. Santafé-Moros
Chemical and Nuclear Engineering Depart., Universidad Politécnica de Valencia, Valencia, Spain
Instituto de Tecnología Química, Valencia, Spain
Oxygen transfer through ceramic membranes at high-temperature can substantially reduce costs respect to conventional separation methods. With the aim to improve the determination of the properties of the ceramic materials, a lab-scale permeation set-up was modeled using the Chemical Engineering Module of COMSOL Multiphysics®. The solution required the coupling of three domains. Gas flow was ...
F. Van den Abeele, and J. Vande Voorde
OCAS N.V., J.F. Kennedylaan 3, Zelzate, Belgium
With offshore oil and gas exploration and production moving into ever deeper waters, the suspended length of marine risers (transporting hydrocarbons from the seabed to the surface) can easily exceed 3000 meters. One of the major design requirements for risers in (ultra) deep water is to limit the fatigue damage caused by vortex induced vibrations (VIV). Even moderate currents can induce vortex ...
B. Chinè, M. Monno, E. Repossi, M. Verani
Laboratorio MUSP Piacenza, Italy; ITCR, Esc. Ciencia e Ing. Materiales, Cartago, Costa Rica
Laboratorio MUSP, Piacenza, Italy; Politecnico di Milano, Dip. Meccanica, Milano, Italy
Politecnico di Milano, MOX-Dip. Matematica, Milano, Italy
The foaming process of a metal is a complex operation which needs to be closely controlled in order to guarantee the wanted properties, by avoiding the formation of defects in the structure of the material. In this work we use COMSOL Multiphysics® version 4.3b and apply the diffuse interface methods of the phase field technique available in the CFD module.To analyze a practical case, foams ...
Ritsumeikan University, Shiga, Japan
The vertical axis wind turbine design depicted in (Fig.1) is widely considered a wind turbine of a wind power generation system because it can be easily miniaturized, it generates low noise, and it rotates regardless of wind direction. The vertical axis wind turbine has, however, low rotation performance when compared with that of a horizontal axis wind turbine. Therefore, we need to improve the ...
Optimization of Extrusion Processes for non-Newtonian high-Viscous Fluids with Wall Slip and Shear Thinning Effects
W. Hoffmann, M. Scholz
SiCo-Solutions, Stuttgart, Germany
Simulation of the flow behaviour of non-Newtonian fluids with high viscosities leads to special material models with specific material parameters. In this presentation, a material model consisting of 4 material parameters describing the flow itself and also the wall slip is presented. The investigations of the flow behaviour are based on COMSOL Multiphysics® using the Modules CFD, Structural ...
L. Murtomäki, S. Kotha
Aalto University, Greater Helsinki, Finland
University Of Helsinki, Helsinki, Finland
There is a great need for an effective drug treatment of the posterior eye, as the major reason for visual disability in industrial countries is Age-related Macular Degeneration (AMD). In USA alone, there are almost 2 million people affected by AMD . A virtual pharmacokinetic 3D model of the human eye is built to address this problem, using COMSOL Multiphysics® software, based on the Finite ...
G.M. Mule, A.A. Kulkarni
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 ...
刘孟杰 , 付芳芳 , 李萌 
动脉瘤破裂是引起蛛网膜下腔出血的一种主要原因。结合 COMSOL Multiphysics® 灵活的几何建模特性以及强大的流体仿真求解能力，本文分别对两组不同大小关系的 MCA 动脉瘤理论模型进行了仿真建模分析。通过模拟分析，获得了动脉瘤球囊体长度和宽度与动脉瘤基底宽度不同比例条件下的动脉瘤速度、压力、壁面切应力（WSS）等参数的变化规律，分析了几何形态与动力学参数之间的关系。模拟结果显示：1、宽颈动脉瘤，瘤体内部旋流强度较之窄颈动脉瘤更强，中心区流速更低，更有利于形成血栓而且顶点处压力更大，更易破裂。2、增大动脉瘤宽度与基底直径的比值，顶点处 WSS 呈非线性增长，但最大值低于 WSS 安全范围的下限值，破裂危险性依然很高；3、动脉瘤宽度与基底直径不同比例下的最大的 WSS 均是主要集中在动脉瘤与载瘤血管结合处（第一剪应力集中区），对血管壁生物组织力学特性影响严重；WSS ...
S. Birla ,
 ConAgra Foods, Omaha, NE, USA
Scraped surface heat exchangers (SSHEs) are commonly used in the food, chemical, and pharmaceutical industries for heat transfer, crystallization, and other continuous processes. One of the factor posing difficulties to heat transfer is viscosity. Highly viscous fluids tend to generate deep laminar flow, a condition with very poor heat transfer rates and high pressure losses involving a ...