O. Toscanelli, and V. Colla
Scuola Superiore S. Anna
The flux of a fluid in permeable media can be modelled using a continuous. To link the real system with the continuous model is mandatory to realize a suitable average of the equations and of the variables. The dispersion term comes from this averaging but it is not only a mathematical product of the modelling. The dispersion is due to the intrinsic geometry of the permeable media that forces ...
D. Kappe, A. Hütten
Bielefeld University, Bielefeld, Germany
Designing and constructing a lab-on-a-chip device poses a variety of questions. Transport of all required substances, detection of the analyte and its deposition on a sensor have to be incorporated. Different strategies have been developed to achieve good coverages of the sensor, like employing electric or magnetic gradients. On the basis of a ramp like structure, the binding of the analyte to a ...
Finite Element Evaluation of Surface Acoustic Wave Reflection and Scattering from Topographic Irregularities Comparable with the Wavelength
S. Yankin[1,2], S. Suchkov, S. Nikitov[2,3], B. Sveshnikov, I. Shatrova 
Joint International Laboratory LICS/LEMAC, IEMN UMR CNRS 8520, EC Lille,Villeneuve d’Ascq, France
Saratov State University, Saratov, Russia
Institute of Radio-engineering and Electronics, Russian academy of Science, Moscow, Russia
Design of SAW devices needs the accurate study of the scattering fields, arising from the interaction of SAW with topographic irregularities. To solve this problem FE methods very perspective, because with its help one can take into account the actual geometry of the electrodes and reflectors. This work describes results of original time domain calculation of 2D SAW scattering fields in delay ...
Determining Degradation in Solid Oxide Fuel Cells Electrode Materials Using COMSOL Multiphyics® Software - new
G. Cui, Z. Chen, F. Tariq, V. Yufit, N. Brandon
Imperial College London, London, UK
Solid Oxide Fuel Cells (SOFCs) are one of the most attractive technologies for meeting our future energy demands. They promise the efficient conversion of chemical to electrical energy and are a growing area of both academic and industrial interests. Typical electrode-supported SOFCs consist of three key components, two porous functional electrode layers (anode and cathode) and one dense ...
万通 , 雍兴跃 , 肖宁 ,
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 ...
Numerical Simulation of Acoustic Properties of Porous Metals under High Sound Pressure Level Conditions
B. Zhang , X. Wang , L. Ni 
 School of Mechanical Engineering, Ningxia University, China
The sound propagation and absorption properties in porous media under high sound pressure level conditions have been reported elsewhere. Also several analytical and semi-analytical solutions have been developed; however, these solutions are relatively complicated and the provided results are not accurate enough yet. In this work, the simulated results for the study of the sound absorption ...
A. Verschueren, and P. K. Tomaszewski
Philips Research Laboratories Eindhoven
Micro Systems & Devices group
High Tech Campus 4
Eindhoven, The Netherlands
All particles in suspension have a zeta potential, or surface potential. Its measurement is extremely important for predicting the formulation stability across a wide range of industries including food, ink and pharmaceuticals, water purification and medical devices. Zeta potential is not measurable directly but it can be calculated from an experimentally determined electrophoretic mobility. ...
B. Hari and C. Theodoropoulos
The University of Manchester, School of Chemical Engineering and Analytical Science, Manchester, UK
Microreactors are important alternative to conventional reactors in chemistry, chemical, pharmaceutical and semiconductor industries due to their operation characteristics such as increased mass and heat transfer, uniform flow, safety, high throughput through array configurations, smaller plant size and lower cost of production. Models for such reactors need to be able to describe both the ...
Dependence of Potential and Ion Distribution on Electrokinetic Radius in Infinite and Finite-length Nano-channels
J. Schiffbauer, J. Fernandez, W. Booth, K. Kelly, A. Timperman, and B. Edwards
Physics Dept. West Virginia University, Morgantown, WV, USA
Chemical Engineering Dept,West Virginia University, Morgantown, WV, USA
Dept. of Chemistry, West Virginia University, Morgantown, WV, USA
A site-binding/dissociation model is used to determine surface charge in numerical studies of the equilibrium potential and ion distributions inside infinite and finite-length nano-channels. This COMSOL model allows us to investigate the response of surface (zeta) potential to environmental parameters such as reservoir salt concentration, solution pH and wall separation. The resulting ion and ...
E. Gao, and S. Bilen
The Pennsylvania State University, University Park, PA, USA
The Microwave Electrothermal Thruster (MET) is a space electric propulsion device that uses an electromagnetic resonant cavity within which a free-floating plasma is ignited and sustained, heating a propellant gas that is that exhausted out of a gas-dynamic nozzle. For an empty cavity it is fairly straightforward to accurately calculate the cavity’s resonant frequency and describe the ...