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.

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 ...

Pulsed Electric Field Based Material Removal in Microelectrical Discharge Machining

T. Roy[1],, P. Ranjan[2], , R. Balasubramaniam[2]
[1]Homi Bhabha National Institute, Mumbai, India
[2]Bhabha Atomic Research Centre, Mumbai, India

Micro electrical discharge machining (MEDM), a scaled down version of EDM process, is a micro machining process used to fabricate micro holes and intricate shapes in electrically conductive materials irrespective of its hardness. In this process, an electric spark is generated in the gap between the two electrodes (tool as cathode and workpiece as anode) submerged in dielectric that leads to a ...

CFD Investigation of a Photocatalytic Multi-Tube Reactor for Indoor Air Purification

J. van Walsem [1], J. Roegiers [1], S. Lenaerts [1], S. Denys [1],
[1] Department of Bioscience Engineering, University of Antwerp, Antwerp, Belgium

In industrial countries, people spend most of their time indoors. Stringent heat-insulation measures in combination with deficient ventilation have a negative impact on indoor air quality [1]. Integration or retrofitting of a photocatalytic oxidation or PCO reactor into continuous flow systems like HVAC (Heating, Ventilation and Air Conditioning) equipment is an interesting approach for abating ...

HIIPER Space Propulsion Simulation Using AC/DC Module

Z. Chen [1], D. Ahern [1], G. Miley [1],
[1] University of Illinois at Urbana-Champaign, Urbana, IL, USA

The Helicon Injected Inertial Plasma Electrostatic Rocket (HIIPER) is an electric space propulsion concept being studied that utilizes a helicon source to generate a plasma and metal grids from inertial electrostatic confinement (IEC) fusion experiments to accelerate ions, generating a thrust. The IEC-type grids are of interest as a way to simultaneously generate a beam of high energy electrons ...

Multiphysics Simulations for the Design of a Superconducting Magnet for Proton Therapy

C. Calzolaio [1], H. Carolin [1], S. Stephane [1],
[1] Paul Scherrer Institut, Villigen, Switzerland

The use of proton therapy for cancer treatment shows a growing trend, since the radiation dose delivered to the target volume is maximized and the dose to the surrounding healthy tissues is minimized. To direct the proton beam from all directions to the tumor in the patient, the last part of the beam transport system is mounted on a gantry rotating 360° around the patient. This system consists ...

超导转变边探测器 (TES) 的电热仿真

吕越 [1],
[1] 中国科学院上海微系统与信息技术研究所

超导转变边沿探测器 (TES) 是一种电压偏置的电热器件,稳态时超导薄膜产生的焦耳热与通过热连接传递到热沉的热量相等。本文利用有限元仿真软件 COMSOL Multiphysics® 对处于热平衡的 TES 进行了电流-热传导仿真。得到稳态时TES器件的温度分布,并计算得到TES器件的关键参数热导 G,同时得到了器件处于稳态时薄膜温度与偏置电压 (V-T) 的关系,这对于器件设计有着极大的帮助。

基于 COMSOL Multiphysics 的水中等离子电弧放电的分析

Yiyi Zhan [1], 唐文虎 [2],
[1] 广州航海学院
[2] 华南理工大学

在过去的二三十年中,液体燃烧电弧被用来制造纳米碳结构。该方法利用电弧空间中存在的碳蒸气作为电极腐蚀的结果,在存在高温梯度的区域迅速冷却时形成碳纳米管和富勒烯。碳结构的形成速率和结构取决于等离子体环境和形成机制两个方面。目前的研究工作,等离子体环境的形成和从电极表面的碳蒸气的传输是用二维电弧模型计算研究的。利用流动气液界面的传热来确定水的蒸发速率,考虑到电弧辐射对水蒸发的贡献以及碳和水蒸气之间的化学反应。此项研究使用 COMSOL Multiphysics 等离子体模块及传热模块。

±800kV 直流输电线路标称电场计算

王平 [1], 李抗 [1], 钦雨晨 [1], 赵映宇 [1],
[1] 华北电力大学

为提高长距离大容量输电的经济性,我国采用特高压直流技术。随着特高压工程的建设和民众电磁环境意识的增强,电磁环境成为影响输电线路结构和建设费用的重要因素。合成电场是特高压输电工程的电磁环境效应之一,其由导线电荷产生的标称电场和空间电荷产生的离子流场组成。标称电场的计算是合成电场计算的前提,本文采用 COMSOL 软件计算了 ±800kV 直流输电线路周围的标称电场。

激光增材制造中的热质输运

李志永 [1],
[1] 中科院力学所

钴基高温合金,因其优异的高温综合性能而被广泛应用于航空发动机制造等领域,激光增材制造是制造几何形状复杂的高温合金零件的有效途径。目前,高温合金增材制造中,缺陷与组织成分的控制是关键的技术瓶颈,而这两方面的问题都与熔池中的热质传输过程密切相关,因此我们将研究的方向着眼于揭示熔池流动背后复杂的物理现象。本研究基于 COMSOL 多物理场耦合,应用 ht、tpfmm、tcs 接口,提出了适用于高温合金多组分热质传输的数值模型,研究了温度梯度G以及凝固速率R对界面围观凝固组织的影响以及钴基合金中主要成分 Fe、C、Co、Cr 的传质特性以及成分分布,基于本模型能偶较为准确的预测并解熔池的凝固行为,组织结构以及对性能的影响。

Identification and Analysis of Low-Frequency Cogging Torque Component in Permanent Magnet Machines

D. McIntosh
Sonsight Inc. / NSWC, Accokeek, MD, USA

Cogging torque in permanent magnet motors and generators is characterized by a torque ripple. These torque fluctuations cause vibrations, noise and speed fluctuations. This paper presents finite element (FE) analyses results that show a previously unaddressed low frequency modulation of cogging torque ripple. The paper resulted in an analytical formulation of cogging torque with low frequency ...