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Voyez comment la modélisation et la simulation sont utilisées par les industries La modélisation et la simulation multiphysiques pilotent l'innovation dans tous les grands secteurs d'activité et dans le monde universitaire — comme en témoignent les nombreuses utilisations présentées dans des articles et des posters techniques présentés par des ingénieurs, chercheurs et scientifiques à la Conférence COMSOL chaque année. Inspirez-vous des récents proceedings réunis ci-dessous, ou, pour trouver les présentations les plus intéressantes dans votre domaine d'intérêt, utilisez la recherche rapide.

Consultez les proceedings de la Conference COMSOL 2024

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准二维限域空间中的马兰戈尼流的实验研究与仿真

蔡哲仁 [1], 宋延林 [1],
[1] 中国科学院化学研究所

马兰戈尼（Marangoni）流是由液体表面张力梯度引起的流体流动现象。流体表面的温度梯度和溶质浓度梯度都可以形成表面张力梯度。本论文研究在一个准二维空间中的液滴由浓度梯度引起的马兰戈尼流。一滴水滴被夹在两个玻璃片之间形成一个薄的圆形液膜。在这个圆形液膜周围构造一个有梯度的有机溶剂（如乙醇）蒸汽浓度场，水滴表面不同位置溶解有机溶剂的量不同从而产生浓度梯度，进而形成马兰戈尼流。或者在溶解有表面活性物质的水滴周围构造不均匀的表面蒸发速率，同样能产生表面浓度梯度和马兰戈尼流。通过使用COMSOL我们可以方便的模拟流体流动，蒸发和稀物质传递相互耦合的问题。首先 ... En savoir plus

The effect of viscosity on dynamics of Electrowetting droplet

NingWeng [1], Qinggong Wang* [1], Wei Yao* [1],
[1] Qian Xuesen Laboratory of Space Technology, China Academy of Space Technology, Beijing, China

Electrowetting (EW) has found a wide range of the potential applications including fast response displays, lab-on-a-chip microfluidic devices, and light vales. However, fundamental understanding of dynamics of EW-actuated droplet is not clear. In this work, a combined numerical approach ... En savoir plus

A Multi-physics Study of the Ion Transport in Wireless Bipolar Nanopore Electrodes

Y. L. Ying [1], Y. J. Li [1], R. Gao [1], Y. X. Hu [1], L. F. Cui [1], L. Q. Ruan [1],
[1] East China University of Science & Technology, Shanghai, China

Wireless Bipolar Nanopore Electrode (WNE) as a new type of nanoelectrode offers a novel and generally accessible tool for analyzing single molecules/ions, discriminating single particles and probing single cells. The WNE fabricates by a metal coated quartz nanopore, which owns a gold ... En savoir plus

基于多级力学耦合的气传孢子分离微流控芯片设计

徐佩锋 [1], 杨宁 [1], 刘海龙 [1],
[1] 江苏大学

对气传真菌孢子进行分离和分类是实现农作物真菌病害早期精确检测的重要环节，基于气溶胶颗粒运动理论，论文提出了多级力学耦合微流控芯片的气传孢子提取方法。利用COMSOL Multiphysics软件的CFD和粒子追踪功能，设计多弯曲通道的一级分离结构，实现气流中单孢子和团聚态孢子的预处理和初级分离。然后根据单向受力加速原理，设计径向鞘流加速的二级分离结构，实现对气流中特定孢子提取的二级分离。在两级分离结构之间设置了台阶递降和双鞘流聚焦耦合结构，以保证通道宽度和气流速度的匹配。论文阐述了各环节的工作原理，并分别进行了实验分析和验证。研究结果表明 ... En savoir plus

致密储层压裂开发有效缝长（改造体积）定量分析与评价

张启涛 [1], 朱维耀 [1], 岳明 [1], 刘昀枫 [1], 陈震 [1], 刘雨薇 [1],
[1] 北京科技大学

在页岩或致密储层油气开发过程中，水力压裂技术得到了广泛引用。在传统的油藏数值模拟中，裂缝参数如导流能力等一般是给定值，而在低渗致密储层实际开发过程中，受铺砂浓度等影响，压裂裂缝只有部分发挥增产效果，可以称之为有效裂缝。考虑铺砂浓度随裂缝长度的变化关系，基于COMSOL地下水模块和裂隙流模块，建立了致密砂岩储层压裂开发渗流数值模型。模型通过对达西定律模型进行修改，以考虑启动压力梯度对渗流规律的影响。同时针对致密储层的两种裂缝形态：经典长缝和网状体积缝，分别进行了有效缝长和有效改造体积的定量分析与评价。本文从铺砂造缝，储层特性，生产制度等方面进行影响因素分析 ... En savoir plus

Numerical Prototyping of Locally Heated Digital Microfluidic Devices

C. Ozen [1], G. Sathyanarayanan [1], S. Cito [2], T. Sikanen [1],
[1] Faculty of Pharmacy, Drug Research Programme, University of Helsinki, Helsinki, Finland
[2] Department of Mechanical Engineering, Rovira i Virgili University, Tarragona, Spain

An alternative approach to integration of a local heat source with the digital microfluidic (DMF) platform by attaching inkjet-printed silver microheaters to the bottom plate was recently introduced (Sathyanarayanan et al., MNE 2017). This approach allows more degrees of freedom to the ... En savoir plus

3D-Printed Microfluidic Chip System for Dielectrophoretic Manipulation of Colloids

I. Kuehne [1], N. Philippin [1], M. Michatz [2], A. Frey [2],
[1] Heilbronn University of Applied Science, Kuenzelsau, Germany
[2] University of Applied Science, Augsburg, Germany

INTRODUCTION: Microfluidics, as a crucial technology of recent years, enables numerous applications for Point-of-Care-Testing such as Lab-on-Chip-Systems (LOC) or Micro-Total-Analysis-Systems (µTAS) and is exceptionally well-suited for cell sorting or DNA trapping. Especially the ... En savoir plus

Simulating 200 kHz AC Tumor-Killing Fields with COMSOL Multiphysics®

K. W. Carlson [1], N. Paudel [2], S. Dokos [3], J. A. Tuszynski [4],
[1] Beth Israel Deaconess Medical Center - Harvard Medical School, Boston, MA, USA
[2] IEEE, Greenville, NC, USA
[3] University of New South Wales, Sydney, NSW, Australia
[4] University of Alberta, Edmonton, AB, Canada

Alternating 200 kHz electric fields ~2 V/cm (Tumor Treating Fields, ‘TTFields’) kill cancer cells by disrupting the delicate orchestration of chromosome spindle formation, but the exact mechanism of action is unknown. The likely suspects are polarized intracellular molecules such as ... En savoir plus

Analyzing Fluid Shear Stress in the RCCS: Applications for 3D Cell Culture in Simulated Microgravity

T. Masiello [1], A. Dhall [1], L. P. Madhubhani Hemachandra [1], N. Tokranova [1], J. Castracane [1]
[1] Colleges of Nanoscale Science and Engineering, SUNY Polytechnic Institute, Albany, NY, USA

In the decades since humans first went to space, there has been growing interest in utilizing microgravity to improve our understanding in many scientific fields (1). Applied fields have included evolutionary development, cell mechanics and protein crystallization (2-4). Microgravity ... En savoir plus

The Effect of Microchannel Geometry on Dispersing Solute Asymmetries

A. Taylor [1], D. Harris [1],
[1] Brown University, Providence, RI, USA

Within the field of microfluidics, scientists and engineers have found ways to manipulate flow at the micron scale in order to downsize standard experimental procedures. These techniques boast faster results while consuming less resources. Microfluidic devices can be used for point-of ... En savoir plus

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