Here you will find presentations given at COMSOL Conferences around the globe. The presentations explore the innovative research and products designed by your peers using COMSOL Multiphysics. Research topics span a wide array of industries and application areas, including the electrical, mechanical, fluid, and chemical disciplines. Use the Quick Search to find presentations pertaining to your application area.

Modeling of a Direct Methanol Fuel Cell

J. Drillet [1],
[1] DECHEMA-Forschungsinstitut, Frankfurt, Germany

This work aims at the modelling of a 5 cm^2 Direct Methanol Fuel Cell (DMFC) with mixed serial/parallel serpentine flow fields in terms of current/voltage behavior. One of the main challenge to overcome consists on lowering the so-called methanol cross over from the anode through the polymer membrane to the cathode that is responsible for mixed-potential formation at the cathode where both ...

Modeling and Characterization of Piezoelectric Structures: From Bulk Material to Thin Film

M. Bavencoffe [1], N. Tembhurnikar [1], B. Negulescu [2], J. Wolfman [2], G. Feuillard [1]
[1] INSA Centre Val de Loire, GREMAN, UMR CNRS 7347, 3 rue de la Chocolaterie, 41034 Blois, France
[2] François Rabelais University, GREMAN, UMR CNRS 7347, Parc de Grandmont, 37200 Tours, France

With the development of micro and nanotechnologies, integrated structures based on piezoelectric thin films are widely investigated and their characterization become a crucial issue for the development of new applications. A laser interferometry is here used to assess the mechanical response in quasistatic regime of a piezoelectric sample. To complete this experimental approach, a numerical ...

电晕放电紫外光谱仿真与测量

庾金涛 [1], 李清灵 [1], 房陈岩 [1],
[1] 中科院上海技术物理研究所,上海,中国

随着我国国民经济的持续高速发展,生活与生产的用电量越来越大,电力行业的规模日益增大。电力设备在不正常工作时,大多会产生电弧电晕,通过检测电晕电弧等目标,就可以获知电力系统设备的损害程度。然而,目前并没有对真实的电弧电晕目标进行非光子计数方式的定量化研究。本文作者研制了一套紫外外波段的面阵成像探测系统,对实验室人工制造的高电压电弧电晕目标进行了相关的分析与实验研究。 利用 COMSOL Multiphysics® 的等离子体物理场接口的 DC 放电接口,对实验所用的天梯仪器的放电行为建模,分子碰撞数据选择大气压下的空气模型,对电晕放电辉光主要贡献的成分N2+,进行密度分布计算,结果换算成光强,得到定性的光强分布,与相机拍摄结果对比。 自制的一套紫外面阵成像系统,对由实验室高压设备在空气中产生的电弧电晕目标开展了紫外成像实验,对电弧电晕目标在 200-1000nm ...

电极压缩程度对钒液流电池性能的影响

王琼 [1], 屈治国 [1],
[1] 西安交通大学,西安,中国

钒液流电池储能技术作为高效电化学储能技术之一,可应用于新能源储能,电网削峰填谷、调频调幅、应急电源等。钒液流电池储能技术具有独立的的额定功率和额定能量,高输出功率,低成本等特点[1]。本文采用分区建模,模型耦合的方式进行模拟。 结果: 钒液流电池在组装过程中需要一定的组装压力以避免电解液的泄漏,同时可减小电极与集流板的接触电阻[2]。如图1所示,有研究表明有流道的集流板与石墨毡电极接触并挤压时,由于流道脊与流道的不均匀表面,会使石墨毡电极出现非均匀压缩现象[3]。图2为均匀模型(SU-5)与非均匀模型(SNI-5)电池压降与实验结果(Exp-5)在CR=55.67%的对比。结果显示考虑了石墨非均匀压缩导致的变形之后的模拟结果与实验结果相吻合。图3为非均匀模型与均匀模型在CR=41.83%情况下的对比图。如图所示,非均匀模型浓度分布更加均匀,将产生比较小的过电势 ...

Keep it Simple and Learn More - On a Stationary Study of a Time-Dependent Problem

B. Baumann [1], J. Schwieger [1, 2], U. Stein [1], M. Wolff [1],
[1] Hamburg University of Applied Sciences, Hamburg, Germany
[2] University of the West of Scotland, Paisley Campus, United Kingdom

Today’s driver hardware for High-intensity discharge (HID) lamps is bulky, expensive and not particularly energy-efficient. A downscaling of the devices seems possible by increasing the operation frequency from typically 400 Hz to some hundred kilohertz. However, efforts to design high-frequency lamp-driver systems were not successful, since the periodic Joule-heating generates sound waves, ...

Optimization of an Explosive Mixture Cooling Process Including a Phase Change

J. D. Wheeler [1], P. Namy [1], C. Coulouarn [2], E. Benade [2],
[1] SIMTEC, Grenoble, France
[2] TDA Armements, LA-FERTÉ-SAINT-AUBIN, France

In the scope of improvement of the industrial “ammunition cooling” process, a COMSOL Multiphysics® model is developed to transfer an existing cooling process. A device filled with a liquid explosive mixture is placed in an apparatus which controls the environment temperature. This explosive mixture undergoes a phase change during the cooling and the solidification enthalpy is introduced to the ...

Thermoviscous Acoustics – Piezoelectric Modeling and Simulation of Surface Acoustic Wave Devices

V. M. Dhagat [1], P. Dufilie [2],
[1] University of Connecticut, Mansfield, CT, USA
[2] Phonon Corporation, Simsbury, CT, USA

New drug discovery and development is costly; of all compounds investigated for use in humans, only a small fraction is approved for treatments around the world. The pharmaceutical industry has started switching from molecular drugs to protein-based drugs due to high specificity, enhanced efficacy, affinity, solubility, and low toxicity. The estimated market growth of protein-based drugs is ...

Effect of Mass Flow Induced by a Reciprocating Paddle on Electroplating

M. Fukukawa [1], L. Tong [1],
[1] Keisoku Engineering System Co. Ltd., Tokyo, Japan

The reciprocating paddle electrochemical plating cells have been widely applied in microelectronics industry [1-2].The reciprocating paddle is often driven over a cathode aspect horizontally by oscillation set outside a plating cell. The paddle reciprocating parallel to a plating side stirs the electrolyte around the plating aspect to improve electric current distribution on the cathode. The ...

Investigating the Loading Behaviour of Intact and Meniscectomy Knee Joints and the Impact on Surgical Decisions

M. S. Yeoman [1],
[1] Continuum Blue Ltd., Cardiff, United Kingdom

Knee joints are often subject to high loads, which can lead to injury, malalignment, and the progression of osteoarthritis in patients. To better understand the behavior, and the effect of meniscal damage and different meniscectomy repair approaches, a 3D structural mechanics model of a patient specific knee was developed in COMSOL Multiphysics®. The model made use of the Structural Mechanics ...

MRI Birdcage RF Coil Resonance with Uncertainty and Relative Error Convergence Rates

J. T. Fong [1],
[1] National Institute of Standards and Technology, Gaithersburg, MD, USA

In a magnetic resonance imaging (MRI) system, it is necessary to excite the nuclei of a patient into coherent precession for imaging. This requires a coupling between the nuclei and a source of radio frequency (RF) power using a transmitter. To receive a meaningful signal, we also need a coupling between the nuclei and an external circuitry known as the receiver. Both the transmitter and the ...