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传统的微波加热存在加热不均匀加热效率低等问题,对此本文提出了一种微波四端口扫频加热模型。通过使用四个端口馈入能量和使用变化的频率来提高加热的均匀性和效率。微波加热的过程是一个电磁场与固体传热场相互耦合的过程,通过COMSOL软件与MATLAB软件的联合调用实现了四个微波馈口的频率时变微波加热的数值分析。并通过NPA的计算优化了网格,最终通过实验验证了仿真的准确性与可靠性。 仿真模型如图1所示,被加热的物质为45mm45mm15mm的土豆块,土豆块放置在腔体底部中央的聚四氟乙烯托盘上。微波四个侧面个连接BJ26波导,微波通过波导传输到腔体中 ... Mehr lesen
摘要:磁性元器件广泛应用于开关电源系统中,例如:变压器用于电磁能量变换,起到隔离、电压变换等作用;电感器用于储能、吸收电磁干扰等作用。现如今,简单的依靠以往粗略的经验公式或者解析表达式已经不能精确的计算出实际的频率、阻抗和损耗等特性,且很难解决电感器的各类特性和体积间的优化设计。针对此问题,采用COMSOL Multiphysics 多物理场耦合仿真软件。基于案例库中电感器三维建模的案例,根据电感器实物进行三维建模,利用AC/DC磁场(mf)接口和线圈几何分析,得到了在实际工程应用中指定材料和频率范围下的阻抗、电感量、磁场强度分布、热应力和趋肤效应等参数值 ... Mehr lesen
Plasma torches are used in processing of materials and in energy industry for producing plasma. In this work we use the Equilibrium DC Discharge physics interface of COMSOL Multiphysics® to model a DC non- transferred arc plasma torch, under hypothesis of local thermodynamic equilibrium. ... Mehr lesen
Svante Littmarck is the CEO of the COMSOL group. He co-founded COMSOL in 1986. He holds a M.Sc. in Applied Mathematics from the Royal Institute of Technology in Stockholm. In 2004 he received an honorary doctoral degree from the Royal Institute of Technology. Mehr lesen
随着城市用电量的逐年增加,单相变压器连续运行时的损耗发热严重制约了其发展和应用。高温发热会加速绝缘老化和缩短设备使用寿命,甚至导致一系列故障问题,降低设备的可靠性。该问题涉及电-磁-热多物理场耦合,心损耗温升的准确计算至关重要,为此本文基于硅钢片磁化特性的测量数据,考虑铁心磁特性受应力影响,采用 COMSOL Multiphysics 多物理场仿真软件,通过 AC/DC 模块、固体力学模块和传热模块对单相变压器铁心的磁场、应力、损耗和温升分布进行研究。首先施加激励得到铁心磁场及损耗密度分布,最后将损耗值作为温度场的热源,进而计算铁心的温升分布 ... Mehr lesen
Ed Fontes is CTO at COMSOL with specific interest in the transport-reaction products. He has 14 years experience of modeling transport phenomena in industry and 6 years of supervising research projects in Academia. Ed Fontes received his PhD in Electrochemical Engineering from the Royal ... Mehr lesen
Background: Even though the direct nose-to-brain drug delivery has multiple advantages, its application is limited by the low delivery efficiency (<1%) to the olfactory region with standard nasal devices. Novel delivery techniques are needed that can deliver clinically relevant dosage ... Mehr lesen
摘要:高温超导磁悬浮利用车载高温超导块材的磁通钉扎特性实现稳定悬浮,自其研发之初就受到广泛关注。车辆在运行过程中,由于非理想永磁轨道表面的不平顺,高温超导块材内部将会产生交流损耗,这直接影响到高温超导磁悬浮系统的稳定性。本文利用COMSOL Multiphysics 软件,结合PDE模块和传热模块,建立了二维高温超导块材YBCO在交变外磁场下的磁-热耦合模型。通过添加边界条件以实现不同频率和幅值的交变外场激励,在此基础之上计算了超导块材的交流损耗特性和温升特性,并探究了超导块材失超的极限条件,为高温超导磁悬浮系统安全稳定运行提供了一定的指导。 关键词:高温超导磁悬浮 ... Mehr lesen
Vacuum phototriodes (VPT) have been used as photodetectors for many years in particle physics experiments. For example, they were used in the OPAL experiment at LEP and are currently used in the endcap Electromagnetic Calorimeter of the CMS experiment, at CERN’s Large Hadron Collider. ... Mehr lesen
The development and analysis of interconnects in inhomogeneous structures such as very large scale integration chips, printed circuit boards, and multichip modules are essential for next-generation electronic products. In this paper, we illustrate fast and sufficiently accurate ... Mehr lesen