Ici vous trouverez les présentations issues des Conférences COMSOL à travers le monde. Réalisées par des utilisateurs de COMSOL Multiphysics, ces présentations explorent tous les domaines actuels d'innovation. Les applications couvrent pratiquement tous les secteurs industriels et impliquent des phénomènes électriques, mécaniques, fluidiques et chimiques. Utilisez la recherche rapide pour trouver les présentations les plus intéressantes dans votre domaine d'intérêt.

Mathematical Formulation of a PEM Fuel Cell Model

E. Robalinho [1], E. F. Cunha [2], M. Linardi [2], E. I. Santiago [2],
[1] Instituto de Pesquisas Energéticas e Nucleares - IPEN/CNEN, São Paulo, SP, Brazil; and Instituto Federal do Rio Grande do Sul - IFRS, Porto Alegre, RS, Brazil
[2] Instituto de Pesquisas Energéticas e Nucleares - IPEN/CNEN, São Paulo, SP, Brazil

The idea of a friendly implementation of a mathematical formulation using specialist software was performed with the support of COMSOL Multiphysics® software with Chemical Reaction Engineering and Batteries & Fuel Cell Modules. The real problem of a Proton Exchange Membrane – PEM fuel cell modeling involves different scales, multiple variables and processes, coupling of solvers and experimental ...

COMSOL 在微波能领域应用研究

朱铧丞 [1], 张春 [1], 叶菁华 [1],
[1] 四川大学,成都,四川,中国

微波作为信息和能量的载体具有同等重要的应用价值,利用微波对物质产生的物理化学效应进行能量传递及转换已经在化学领域有了积极的应用。从 1986 年 R.N. Gedye 等人首次使用微波促进化学反应使其反应速率提高 1240 倍以来,有越来越多的微波和化学领域的科学家对相关问题进行了研究,并出现了一门新兴学科“微波化学”。微波化学作为研究微波能的一个方面是研究微波与化学反应体系相互作用的一个新兴学科。由于当前人们对微波加快化学反应的研究还非常肤浅,微波在大规模应用中并未发挥出其应有的巨大优势,微波化学进一步发展面临着巨大的挑战和机遇。目前微波化学的研究可以分为宏观和微观两个层面:(1)在宏观层面人们并不关心微波对分子之间行为的影响,其研究要用多物理场数值计算方法获得反应体系中电磁场、温度等物理量的分布和变化;(2)微观层面的研究,重点关注微波对反应分子之间相互作用的影响 ...

数值模拟牺牲阳极法阴极保护电位分布

万通 [1], 雍兴跃 [1], 肖宁 [1],
[1] 北京化工大学,北京,中国

研究结果表明,海水中钢结构设备的腐蚀问题触目惊心,通常会造成设备损坏、性能降低。由此可见,控制腐蚀是一项十分重要的任务。 钢结构设备的防腐保护主要采用阴极保护和涂层保护两种方式,然而,由于涂层自身不可避免的缺陷以及施工过程中导致的缺陷,腐蚀仍将在以上造成的缺陷处发生。因此,在接触海水的部位,为了消除涂层缺陷而造成的腐蚀,通常根据钢结构的实际情况和使用状态,采用阴极保护的方法。电位是阴极保护工程中,对控制和监视阴极保护效果进行评价的一项重要指标,因而,非常有必要去了解被保护设备表面上的电位分布。 使用Comsol进行阴极保护数值模拟计算时,步骤如下: (1)选择物理场 “模型向导”>“三维”>“二次电流分布”>“稳态”>“研究”; (2)建立模型 在COMSOL中按照实际尺寸进行建模; (3)输入参数 模拟所需参数:1)温度T:298.15K; 2)电解质(海水 ...

Multiphysics Simulations of Granular Sludge on the Optimization of Effluent Treatment Plant

S. Gunsekaran [1], R. C. Thiagarajan[1]
[1]ATOA Scientific Technologies Private Limited, Bangalore, India

Multiphysics Simulations of Physico-chemical and Biological Treatment of wastewater is increasing due to the demand for cost efficient plant design and utilization. Among the many processes, a thorough understanding of the settling behavior of an activated granular sludge in the secondary settler of an Effluent Treatment Plant (ETP) is critical for the plant designers to determine the efficiency ...

Singlet Oxygen Modeling for PDT Incorporating Local Vascular Oxygen Diffusion

T. C. Zhu[1], B. Liu[1]
[1]University of Pennsylvania, Philadelphia, PA, USA

Singlet oxygen (1O2) is the major cytotoxic agent that kills cells during photodynamic therapy (PDT). Based on a previously-developed model, the distance-dependent reacted 1O2 can be numerically calculated using finite-element method. We improved the model to include microscopic kinetic equations of oxygen diffusion from uniformly distributed blood vessels to the adjacent tissue. The blood ...

Virtual Pharmacokinetic Model of the Human Eye - new

L. Murtomäki[1], S. Kotha[2]
[1]Aalto University, Greater Helsinki, Finland
[2]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 [1]. A virtual pharmacokinetic 3D model of the human eye is built to address this problem, using COMSOL Multiphysics® software, based on the Finite ...

Study of the CO2 Transfer Rate in a Reacting Flow for the Refined Sodium Bicarbonate Production Process

C. Wylock[1], A. Larcy[1], P. Colinet[1], T. Cartage[2], and B. Haut[1]
[1]Université Libre de Bruxelles, Brussels, Belgium
[2]Solvay S.A., Brussels, Belgium

This work deals with the quantification of the CO2 transfer rate from a bubble to the surrounding liquid in a bubble column. A model is successfully developed using COMSOL Multiphysics. The validated model is used to study the enhancement influence of chemical reactions on the transfer rate. Moreover, the results of this study are compared with a classical 1-D approach and excellent comparison ...

Numerical Simulation of pH-sensitive Hydrogel Response in Different Conditions

M.K. Ghantasala[1], B.O. Asimba[1], A. Khaminwa[1], K.J. Suthar[2], D.C. Mancini[3]
[1]Department of Mechanical and Aeronautical Engineering, Western Michigan University, Kalamazoo, MI, USA
[2]Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA
[3]Physical Sciences and Engineering, Argonne National Laboratory, Argonne, IL, USA

The understanding of pH-sensitive hydrogel swelling response in different buffer environmental condition is essential for its use in different practical applications. This necessitates its simulation in steady state and transient conditions. This paper mainly deals with the details of the numerical simulation performed by developing coupled formulation of chemo-electro-mechanical behavior of ...

Modeling of a Biogas Steam Reforming Reactor for Solid Oxide Fuel Cell Systems

F. Cipitì[1]
[1]CNR-ITAE, Institute of Advanced Technologies for Energy, Messina, Italy

A biogas steam reforming reactor has been developed in order to be integrated into a proof-of-concept SOFC system, able to operate with biogas produced in an industrial waste water treatment unit. A mathematical model, aimed at describing the performance of the reactor, has been developed. The reactor is simplified and modeled as a non-isothermal plug flow reactor. The reactor is fed with a ...

Updated Results of Singlet Oxygen Modeling Incorporating Local Vascular Diffusion for PDT - new

R. Penjweini[1], M. M. Kim[1], T. C. Zhu[1]
[1]Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA, USA

Introduction: Singlet oxygen (¹O₂) has a critical role in the cell-killing mechanism of photodynamic therapy (PDT). Therefore, in this study, the distance-dependent reacted ¹O₂ is numerically calculated using finite-element method (FEM). Herein, we use a model [Ref. 1] that has been previously developed to incorporate the diffusion equation for the light transport in tissue and the macroscopic ...