Relevant bibliographies by topics / COMSOL Multiphysics simulations

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'COMSOL Multiphysics simulations'

Author: Grafiati
Published: 4 June 2021
Last updated: 3 February 2022

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Journal articles on the topic "COMSOL Multiphysics simulations"

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Adam, Tijjani, and U. Hashim. "COMSOL Multiphysics Simulation in Biomedical Engineering." Advanced Materials Research 832 (November 2013): 511–16. http://dx.doi.org/10.4028/www.scientific.net/amr.832.511.

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In the past two decades, COMSOL Multiphysics Software Package have emerged as a powerful tool for simulation, particularly in Nanotechnology and most importantly in biomedical application and various application involving fluid and solid interactions. Compared with conventional component or system design, distinctive advantages of using COMSOL software for design include easy assessing to the significant parameters in various levels of design, higher throughput, process monitoring with lower cost and less time consuming [1,. This review aims to summarize the recent advancements in various approaches in major types of micro fluidic systems simulations, design application of various COMSOL models especially in biomedical applications. The state-of-the-art of past and current approaches of fluid manipulation as well as solid structure design fabrication was also elaborated. Future trends of using COMSOL in nanotechnology, especially in biomedical engineering perspective.
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Asmi, Ade, Jouvan Chandra Pratama Putra, and Ismail Abdul Rahman. "Simulation of Room Airflow Using Comsol Multiphysics Software." Applied Mechanics and Materials 465-466 (December 2013): 571–77. http://dx.doi.org/10.4028/www.scientific.net/amm.465-466.571.

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Airflow in a room can be supplied both through natural mean and also by the helps of mechanical ventilation. Natural ventilation is more sustainable compared to mechanical system; however natural ventilation, it may not be sufficient to fulfil the need of ventilation for a specific room. This study presents simulation works carried out regarding to the airflow movement in a room due to mechanical ventilation. The measurement of air velocity was taken using Davis anemometer at random point in the room. The measured air velocity then used as an input in simulation work which used Comsol Multiphysics software. The simulation process begins by building up geometry of the room, assigning constant parameters, meshing the geometry of the room, and finally run the solver analysis. The results from simulations indicate that the air distributions in the room are below ASHRAE standard. This is due to the airflow distribution from the airflow injection of air-conditioning system is not well distributed. The simulations results are validated with the measured value and found that the percentage differences between the simulated and measured values are within the range of 3 - 10 %. Keywords: Simulation, Airflow movement, Mechanical ventilation, Comsol Multiphysics software
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M ziou, Nassima, Hani Benguesmia, and Hilal Rahali. "Modeling Electric Field and Potential Distribution of an Model of Insulator in Two Dimensions by the Finite Element Method." International Journal of Energetica 3, no. 1 (June 30, 2018): 01. http://dx.doi.org/10.47238/ijeca.v3i1.58.

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The electrical effects can be written by two magnitudes the field and the electrostatic potential, for the determination of the distribution of the field and the electric potential along the leakage distance of the polluted insulator, the comsol multiphysics software based on the finite element method will be used. The objective of this paper is the modeling electric field and potential distribution in Two Dimensions by the Finite Element Method on a model of insulator simulating the 1512L outdoor insulator used by the Algerian company of electricity and gas (SONELGAZ). This model is under different conductivity, applied voltage, position of clean layer and width of clean layer. The computer simulations are carried out by using the COMSOL multiphysics software. This paper describes how Comsol Multiphysics have been used for modeling of the insulator using electrostatic 2D simulations in the AC/DC module. Numerical results showed a good agreement.
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Hashim, U., M. Wesam Al-Mufti, and Tijjani Adam. "Current Trend in Simulation: A Study Simulation of Poly-Silicon Nanowire Using COMSOL Multiphysics." Advanced Materials Research 795 (September 2013): 669–73. http://dx.doi.org/10.4028/www.scientific.net/amr.795.669.

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Poly-Silicon nanowire (Poly-Si-NW) simulations are very important field of nanotechnology and nanostructures; in this paper presented review in general nanowire and it applications such as thermoelectric device (TED) has potential applications in areas such as chip level cooling/ energy harvesting and many more applications in this field .COMSOL multiphysics is one of programmers using for nanotechnology and nanowires simulation, hence in this review paper, COMSOL simulation with different types of materials using for nanowire and other structures. Also In this work, we explore the effect of the electrical contact resistance on the performance of a TED. COMSOL simulations are performed on Poly-SiNW to investigate such effects on its cooling performance. Intrinsically, Poly-SiNW individually without the unwanted parasitic effect has excellent cooling power density. However, the cooling effect is undermined with the contribution of the electrical contact resistance.
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Liu, Y. C., Y. C. Huang, Yun Jhe Tang, and Tzu Hsuan Lei. "Evaluations of Absorption Materials Applied in the Noise Reduction: Experiment and Simulation." Materials Science Forum 947 (March 2019): 125–29. http://dx.doi.org/10.4028/www.scientific.net/msf.947.125.

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This article presents a finite element simulation method for airflow resistance of material to predict the influence of absorption material applied to compressor box. To obtain the real airflow resistance, a measurement system based on the standard ASTM C522-03 was systematically built up and carefully verified. Furthermore, commercial finite element software, COMSOL Multiphysics, was adopted to create the model and execute the simulation with and without absorption material. Results showed that airflow resistance increases with the thickness and the density of the material. This system is quite stable and suited to any material. With the aid of COMSOL Multiphysics simulations, the performance of noise with and without absorption material can be analyzed and compared with experimental results. There was good agreement between experimental and simulation results. Based on absorption material of 15,278 Pa.s/m3 airflow resistance, the noise level outside the compressor box obtained from experiment was around 10 dBA higher than that obtained from simulation.
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Tang, Guan Rong, Si Di, Xin Xu, and Qiu Lan Chen. "Design and Simulation of Piezoresistive Pressure Sensor for Ocean Depth Measurements." Applied Mechanics and Materials 411-414 (September 2013): 1552–58. http://dx.doi.org/10.4028/www.scientific.net/amm.411-414.1552.

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This paper presents the design and simulation of a piezoresistive pressure sensor with wide operation range (up to the pressure of 1000 m-deep water). Structural and electrical simulations were carried out using COMSOL Multiphysics 4.3. The dimension of the membrane, and the geometry and placement of piezoresistors, were optimized through structural simulations. Electrical simulations were used to evaluate the performance of selected sensors. The output characteristics revealed good linearity throughout the measurement range with sensitivities of 0.4500~0.8964 mV/V/MPa. The optimum design of sensor was determined according to the simulation results.
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Mazloum, Shawki, Sary Awad, Youssef Abou Msallem, Nadine Allam, Khaled Loubar, and Mohand Tazerout. "Modeling of a pyrolysis batch reactor using COMSOL Multiphysics." MATEC Web of Conferences 261 (2019): 04003. http://dx.doi.org/10.1051/matecconf/201926104003.

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Plastic Pyrolysis is a thermal degradation process; it offers an important alternative energy. The aim of this study is to model a batch reactor to be used for plastic pyrolysis. Consequently, four experiments with different heating and cooling cycles are done using an empty pyrolysis batch reactor and four temperatures are measured at different locations on the reactor. On the other hand, the empty reactor is modeled and several simulations are done, using COMSOL Multiphysics software, under the same experimental conditions. By comparing the temperatures obtained from simulation to those measured experimentally, it is noticed that the results are very close with a maximum error of 4%, hence the model is validated.
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Aissa, Abderrahmane, Mohamed Abdelouahab, Abdelkader Noureddine, Mohammed Elganaoui, and Bernard Pateyron. "Ranz and Marshall correlations limits on heat flow between a sphere and its surrounding gas at high temperature." Thermal Science 19, no. 5 (2015): 1521–28. http://dx.doi.org/10.2298/tsci120912090a.

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Direct numerical simulations (DNS) for axisymmetric plasma jet are developed to investigate particle plasma spraying process. In this paper we study the plasma jet and we focus mainly on the plasma-particle ex-changes. Finite element analysis employing COMSOL Multiphysics software is used in this simulation. Finally, comparisons are made with the numerically observed particle Nusselt?s numbers and theoretically predicted Nusselt?s numbers based on the Ranz-Marshall correlation. The results agree well with those obtained previously.
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Lei, Lei, Hong Bo Zhang, Donald J. Bergstrom, Bing Zhang, and Wen Jun Zhang. "Modeling of Droplet Generation by a Modified T-Junction Device Using COMSOL." Applied Mechanics and Materials 705 (December 2014): 112–16. http://dx.doi.org/10.4028/www.scientific.net/amm.705.112.

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This paper presents a numerical study of the formation of droplets in a novel two-dimensional T-junction device by using a commercial CFD package: COMSOL Multiphysics. Numerical simulations were carried out for different flow conditions. Different flow rates lead to four regimes: continuous flow, droplet generation, detached, and stalled. The capillary number of the cross-flow turns out to be the key factors in the droplet generation process. The simulation results are validated by comparison to the existing experimental data.
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El Achkar, Georges, Bin Liu, and Rachid Bennacer. "Numerical study on the thermohydraulic performance of a reciprocating room temperature active magnetic regenerator." E3S Web of Conferences 128 (2019): 07001. http://dx.doi.org/10.1051/e3sconf/201912807001.

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In this paper, the thermohydraulic performance of a reciprocating room temperature active magnetic regenerator (AMR), with gadolinium (Gd) particles used as a magnetocaloric material (MCM) and water used as a working fluid, was numerically investigated. A two-dimensional transient flow model was developed using COMSOL Multiphysics, in order to determine the water flow distribution in two AMRs of cross and parallel Gd particles distributions for different water inlet velocities of 0.06 m.s-1, 0.08 m.s-1 , 0.1 m.s-1 and 0.12 m.s-1. The Gd particles have a radius of 1.5 mm and a distance from one another of 0.9 mm. Based on the simulations results of the first model, a two-dimensional transient coupled flow and heat transfer model was then developed using COMSOL Multiphysics, in order to characterise the convective heat transfer in the AMR of cross Gd particles distribution for the same water inlet velocities.
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Dissertations / Theses on the topic "COMSOL Multiphysics simulations"

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Sjökvist, Stefan. "Demagnetization Studies on Permanent Magnets : Comparing FEM Simulations with Experiments." Licentiate thesis, Uppsala universitet, Elektricitetslära, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-236301.

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In a world where money often is the main controlling factor, everything that can be tends to be more and more optimized. Regarding electrical machines, developers have always had the goal to make them better. The latest trend is to make machines as efficient as possible, which calls for accurate simulation models where different designs can be tested and evaluated. The finite element method is probably the most popular approach since it makes it possible to, in an easy and accurate way, get numerical solutions to a variety of physics problems with complex geometries and non-linear materials. This licentiate thesis includes two different projects in which finite element methods have had a central roll. In the first project, the goal was to develop a simulation model to be able to predict demagnetization of permanent magnets. It is of great importance to be able to predict if a permanent magnet will be demagnetized or not in a certain situation. In the worst case, the permanent magnets will be completely destroyed and the machine will be completely useless. However, it is more probable that the permanent magnets will not be completely destroyed and that the machine still will be functional but not as good as before. In a time where money is more important than ever, the utilization has to be as high as possible. In this study the demagnetization risk for different rotor geometries in a 12 kW direct driven permanent magnet synchronous generator was studied with a proprietary finite element method simulation model. The demagnetization study of the different rotor geometries and magnet grades showed that here is no risk for the permanent magnets in the rotor as it is designed today to be demagnetized. The project also included experimental verification of the simulation model. The simulation model was compared with experiments and the results showed good agreement. The second project treated the redesign of the rotor in the generator previously mentioned. The goal was to redesign the surface mounted NdFeB rotor to use a field concentrating design with ferrite permanent magnets instead. The motivation was that the price on NdFeB magnets has fluctuated a lot the last few years as well as to see if it was physically possible to fit a ferrite rotor in the same space as the NdFeB rotor. A new rotor design with ferrite permanent magnets was presented together with an electromagnetic and a mechanical design.
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Gutiérrez, Daniel. "Green Fuel Simulations." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-79244.

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Many industries have entered a new global phase which takes the environment in mind. The gas turbine industry is no exception, where the utilization of green fuels is the future to spare the environment from carbon dioxide and NOx emissions. Hydrogen has been identified as a fuel which can fulfil the global requirements set by governments worldwide. Combustion instabilities are not inevitable during gas turbine operations, especially when using a highly reactive and diffusive fuel as hydrogen. These thermoacoustics instabilities can damage mechanical components and have economic consequences in terms of maintenance and reparation. Understanding these thermoacoustic instabilities in gas turbine burners is of great interest. COMSOL Multiphysics offers a robust acoustic module compared to other available acoustic simulation programs. In this thesis, an Acoustic finite element model was built representing an atmospheric combustion rig (ACR), used to test the burners performance and NOx emissions. Complementary computational fluid dynamics (CFD) simulations were performed for 100 % hydrogen as fuel by using the Reynolds average Navier-Stokes (RANS) lag EB k - epsilon turbulence model. Necessary data was successfully imported to the Acoustic finite element model. Different techniques of building the mesh were used in COMSOL Multiphysics and NX. Similar results were obtained, proving that both mesh tools work well in acoustic simulations. Two different ways of solving the eigenvalue problem in acoustics were implemented, the classic Helmholtz equation and Linearized Navier-Stokes equations, both in the frequency domain. The Helmholtz equation proved to be efficient and detected multiple modes in the frequency range of interest. Critical modes which lived in the burner and the combustion chamber were identified. Defining a hard and soft wall boundary condition at the inlets and outlet of the atmospheric combustion rig gave similar eigenfrequencies when comparing the two boundary conditions. The soft wall boundary condition was defined with a characteristic impedance, giving a high uncertainty whether the results were trustworthy or not. A boundary condition study revealed that the boundary condition at the outlet was valid for modes living in the burner and combustion chamber. Solving the eigenvalue problem with the Linearized Navier-Stokes equations proved to be computationally demanding compared to the Helmholtz equation. Similar modes shapes were found at higher frequencies, but pressure perturbations were observed in the region where the turbulence was dominant. A prestudy for a stability analysis was established, where the ACR and the flame was represented as a generic model. Implementing a Flame Transfer Function (FTF), more specifically a linear n - tau model, showed that the time delay tau is most sensible for a parametric change and hence needs to be chosen cautiously
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Lisnyak, Marina. "Theoretical, numerical and experimental study of DC and AC electric arcs." Thesis, Orléans, 2018. http://www.theses.fr/2018ORLE2013/document.

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L’apparition accidentelle d’un arc électrique dans le système de distribution électrique d’un aéronef peut compromettre la sécurité du vol. Il existe peu de travaux liés à cette problématique.Le but de ce travail est donc d’étudier le comportement d’un arc électrique, en conditions aéronautiques,par des approches théorique, numérique, et expérimentale. Dans ce travail, un modèle MHD de la colonne d’arc à l’ETL a été utilisé, et résolu à l’aide du logiciel commercial comsolMultiphysics. Afin de décrire l’interaction plasma-électrodes, le modèle a dû étendu pour inclure les écarts à l’équilibre près des électrodes. Ces zones ont été prises en compte en considérant la conservation du courant et de l’énergie dans la zone hors-équilibre. L’approche choisie et le développement du modèle ont été détaillés. La validation du modèle dans le cas d’un arc libre a montré un excellent accord avec les résultats numériques et expérimentaux de la littérature.Ce modèle d’arc libre a été étendu au cas de l’arc se propageant entre des électrodes en configuration rails et en géométrie 3D. Une description auto-cohérente du déplacement de l’arc entre les électrodes a été réalisée. La simulation numérique a été faite pour des arcs en régimes DC, pulsé et AC à des pressions atmosphériques et inférieures. Les principales caractéristiques de l’arc ont été analysées et discutées. Les résultats obtenus ont été comparés avec les résultats expérimentaux et ont montré un bon accord.Ce modèle d’arc électrique est capable de prédire le comportement d’un arc de défaut dans des conditions aéronautiques. Des améliorations du modèle sont discutées comme perspectives de ce travail
The ignition of an electric arc in the electric distribution system of an aircraft can be a serious problem for flight safety. The amount of information on this topic is limited, however. Therefore,the aim of this work is to investigate the electric arc behavior by means of experiment and numerical simulations.The MHD model of the LTE arc column was used and resolved numerically using the commercial software comsol Multiphysics. In order to describe plasma-electride interaction, the model had to be extended to include non-equilibrium effects near the electrodes. These zones were taken into account by means of current and energy conservation in the non-equilibrium layer. The correct matching conditions were developed and are described in the work. Validation of the model in the case of a free burning arc showed excellent agreement between comprehensive models and the experiment.This model was then extended to the case of the electric arc between rail electrodes in a 3D geometry. Due to electromagnetic forces the electric arc displaces along the electrodes. A self-consistent description of this phenomenon was established. The calculation was performed for DC, pulsed and AC current conditions at atmospheric and lower pressures. The main characteristics of the arc were analyzed and discussed. The results obtained were compared with the experimental measurements and showed good agreement.The model of electric arcs between busbar electrodes is able to predict the behavior of a fault arc in aeronautical conditions. Further improvements of the model are discussed as an outlook of the research
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Rezk, Kamal. "CFD as a tool for analysis of complex geometry : Perspectives on time efficient simulations of interior household appliance components." Licentiate thesis, Karlstads universitet, Avdelningen för energi-, miljö- och byggteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-6687.

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Throughout recent years, computer based programs has been applied to solve and analyze industrial problems. One of these developed programs is the Computational Fluid Dynamics (CFD) program. The purpose of implementing CFD analysis is to solve complex flow behavior which is not possible with ordinary calculus. The extensive application of CFD in the industry is a result of improved commercial CFD codes  in terms of more advance partial differential equations (PDE) describing various physical phenomena, CAD and mesh-grid generating tools and improved graphical user interfaces (GUI). Today, CFD usage has extended to fields such as aerodynamic, chemical process engineering, biomedical engineering and drying technology. As there is an on-going expansion of CFD usages in the industry, certain issues need to be addressed as they are frequently encountered. The general demand for simulation of larger control volumes and more advanced flow processes result in extensive requirement of computer resources. Numerous complex flow topics today require computer cluster networks which are not accessible for every company. The second issue is the implementation of commercial CFD codes in minor industrial companies is utilized as a black box based on the knowledge on fluid mechanic theory. A vital part of the simulation process is the evaluation of data through visual analysis of flow patterns, analysis on the sensitivity of the mesh grid, investigation of quantitative parameters such as pressure loss, velocity, turbulence intensity etc. Moreover, increased partnerships between industry and the academic world involving various CFD based design processes generally yields to a verbal communication interface which is a crucial step in the process given the fact of the level of dependency between both sides. The aim of this thesis is to present methods of CFD analysis based on these issues. In paper I, a heuristically determined design process of the geometry near the front trap door of an internal duct system was achieved by implementing the CFD code COMSOL MultiPhysics as a communication tool. The design process was established by two counterparts in the project in which CFD calculations and geometry modifications were conducted separately. Two design criteria presenting the pressure drop in duct and the outflow uniformity was used to assess geometry modifications conducted by a CAD-engineer. The geometry modifications were based on visual results of the flow patterns. The geometry modifications confirmed an improvement in the geometry as the pressure drop was reduced with 23% and the uniformity was increased with 3%. In paper II, volume-averaged equations were implemented in a tube-fin heat exchanger in order to simulate airflow. Focus was on achieving a correct volume flow rate and pressure drop (V-p) correlation. The volume averaged model (VAM) is regarded as a porous medium in which the arrangement of fins and tube bundles are replaced with volume-averaged equations. Hence, the computational time was reduced significantly for the VAM model. Moreover, experimental results of the (V-p) correlation showed good agreement with the VAM model.
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Lama, Lara. "Novel methods for improving rapid paper-based protein assays with gold nanoparticle detection." Licentiate thesis, KTH, Proteomik och nanobioteknologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-214065.

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This thesis describes methods for improving sensitivity in rapid singleplex and multiplex microarray assays. The assays utilize the optical characteristics of colloidal gold nanoparticles for the colorimetric detection of proteins. Multiplexed detection in sandwich immunoassays is limited by cross-reactivity between different detection antibodies. The cross-reactivity between antibodies can contribute to increased background noise - decreasing the Limit-of-Detection of the assay - or generate false positive signals. Paper I shows improved assay sensitivity in a multiplexed vertical flow assay by the application of ultrasonic energy to the gold nanoparticles functionalized with detection antibodies. The ultrasonication of the antibody conjugated gold nanoparticles resulted in a 10 000 fold increase in sensitivity in a 3-plex assay. COMSOL Multiphysics was used to simulate the acoustical energy of the probe used in Paper I for obtaining an indication of the size and direction of the forces acting upon the functionalized gold nanoparticles. In Paper II, it was studied if different gold nanoparticle conjugation methods and colorimetric signal enhancement of the gold nanoparticle conjugates could influence the sensitivity of a paper-based lateral flow microarray assay, targeting cardiac troponin T for the rapid diagnostics of acute myocardial infarction. Ultrasonication and signal enhancement of the detection gold nanoparticles has the potential of improving the sensitivity of paper based assays and expanding their potential future applications.

QC 20170911

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Chvíla, Ladislav. "Vlastnosti fraktálních kapacitorů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219892.

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This work is focused on computer simulations of fractal capacitors. The geometry of capacitors and its influence is investigated. Simulations are realized in programs Matlab, SolidWorks and Comsol Multiphysics. There are also several specific examples of different geometrics of capacitors their comparisons and assessment.
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Galiano, Kevin. "Scanning Probe Microscopy Measurements and Simulations of Traps and Schottky Barrier Heights of Gallium Nitride and Gallium Oxide." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1576715425331868.

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Achour, Bilel. "Capteurs à ondes acoustiques de surface fonctionnant à 104 et 208 MHz. : modélisation, développement et application à la détection d’ions lourds métalliques." Thesis, Le Mans, 2020. http://www.theses.fr/2020LEMA1017.

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Les capteurs à ondes acoustiques de surfaces (SAW : Surface Acoustic Waves) présentent de nombreux avantages, dont une grande sensibilité, un paramètre clé dans diverses applications. Dans cette thèse, deux voies sont explorées pour améliorer la sensibilité des dispositifs SAWs : le passage en mode de Love, avec une couche guide d’onde en résine époxyde SU-8, et la montée en fréquence de 104 à 208 MHz. Avant de réaliser de tels dispositifs en salle blanche puis de les utiliser en tant que capteurs chimiques, des simulations numériques ont été entreprises, en utilisant tout d’abord le logiciel MATLAB, puis par la méthode des éléments finis, via le logiciel COMSOL Multiphysics. L’épaisseur optimale de la couche guide d’onde, permettant un gain important en sensibilité, a été estimée. Un écart entre l’expérience et la simulation a été trouvé soulignant la nécessité de poursuivre les phases d’optimisation dans cette voie. Une confrontation calculs/expériences a été menée avec succès pour les structures SH-SAW. Ces dispositifs ont été fonctionnalisés avec un dérivé d’anthracène pour détecter les ions zinc en milieu aqueux. Les résultats gravimétriques ont montré un gain en sensibilité d’un facteur 2.3, en augmentant la fréquence de travail de 104 MHz à 208 MHz
Surface Acoustic Wave (SAW) sensors have many advantages mainly a high sensitivity, which is a key parameter in various applications. Two strategies were explored, in this thesis, to enhance the sensitivity of SAW devices: switching to Love mode, with a waveguide layer in SU-8 epoxy resin, and frequency increase from 104 to 208 MHz. Prior to the realization of such devices in a clean room and their further use as chemical sensors, numerical simulations were done, first with MATLAB software, and then with the finite element method, via COMSOL Multiphysics software. The optimum thickness of the waveguide layer, allowing a significant gain in sensitivity, was estimated. A disagreement between experience and simulation was found highlighting the need to continue optimization steps. A confrontation between calculations / experiments was carried out for the SH-SAW structures. These devices were functionalized with an anthracene derivate for zinc ions detection in aqueous media. Gravimetric results indicate that increasing the operating frequency from 104 MHz to 208 MHz permits a gain in sensitivity by a factor of 2.3
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Hedkvist, Adam, and Henrik Ahrman. "Simulation of helium flow through ion guide with COMSOL multiphysics." Thesis, Uppsala universitet, Tillämpad kärnfysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-296242.

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The program COMSOL Multiphysics was used to simulate a flow of helium gas transporting ionized fission products out of an ion guide. Two important parameters to study from the simulation was the evacuation time and velocity of the ions. The mean evacuation time was shown to be 0.1173s, and the velocity of a single particle peaked at 2500m/s, 1000-1500m/s being more common.
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Peyrou, David. "Etude théorique et expérimentale des techniques d’assemblage et de mise en boîtier pour l’intégration de microsystèmes radio-fréquences." Toulouse 3, 2006. http://www.theses.fr/2006TOU30130.

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Les Micro Systèmes Electro Mécaniques Radio-Fréquences (MEMS RF) bouleversent le paysage de la microélectronique, en laissant entrevoir des possibilités vertigineuses : exceptionnelles performances hyperfréquences, grande linéarité et faible consommation. Malgré ces avantages indéniables, la mise sur le marché de composants à base de MEMS RF est freinée par leurs manques de maturités au niveau du flot de conception, de la mise en boîtier (packaging) et de la fiabilité. Dans ce contexte, ces travaux de thèse ont porté sur l’étude théorique et expérimentale des techniques d’assemblage et de mise en boîtier pour l’intégration de micro-commutateurs RF opérant en bande X (10 GHz). Après une description des techniques de mise en boîtier suivie d’une analyse fonctionnelle, nous mettons en évidence une solution d’assemblage par report d’un capot avec un scellement en polymère. Afin de répondre aux enjeux de conception, nous avons identifié un besoin de modélisation à partir de logiciels de simulation éléments finis (EF) multi-physique, permettant de générer des macro-modèles comportementaux. Ainsi, nous discutons des possibilités offertes par deux logiciels EF réellement multi-physique : ANSYS et COMSOL. Finalement, nous proposons une solution (boîtier micro-usiné en Foturan et scellement en polymère BCB) compatible avec les possibilités technologiques, les contraintes dimensionnelles en terme d’encombrement, le respect des performances RF et la résistance mécanique. Cette solution a débouchée sur la réalisation et la caractérisation électrique d’un démonstrateur, montrant une très faible atténuation générée par le packaging, moins de 0. 05 dB de pertes à 10 GHz. De ce fait, nous avons pu valider une technique simple de packaging quasi-hermétique, adaptée au micro-commutateurs RF
Radio-Frequency Micro-Electro-Mechanical Systems (RF MEMS) are highly miniaturized devices intended to switch, modulate, filter or tune electrical signals from DC to microwave frequencies. RF Mems switches are characterized by their high isolation, low insertion loss, large bandwith and by their unparalleled signal linearity. Despite these benefits, RF Mems switches are not yet seen in commercial products because of reliability issues, limits in signal power handling and question in packaging. In this context, we put in evidence, a near hermetic packaging based on a micro-machined cap in Foturan sealed onto a photopatternable polymer Benzo-Cyclo-Butene (BCB) as a solution adapted to micro-switches RF. To answer the stakes in conception, we identified needs in multiphysics modelling able to generate behavioural macro-models. Finally, a demonstrator was characterised in terms of return and insertion losses measurements, which assures insignificant impact of the package on the RF losses
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Books on the topic "COMSOL Multiphysics simulations"

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Pryor, Roger W. Multiphysics modeling using COMSOL: A first principle approach. Boston: Jones and Bartlett Publishers, 2010.

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Pryor, Roger W. Multiphysics modeling using COMSOL: A first principles approach. Boston: Jones and Bartlett Publishers, 2010.

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Pryor, Roger W. Multiphysics modeling using COMSOL: A first principles approach. Sudbury, Mass: Jones and Bartlett Publishers, 2011.

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Pryor, Roger W. Multiphysics modeling using COMSOL: A first principles approach. Boston: Jones and Bartlett Publishers, 2010.

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Multiphysics modeling using COMSOL 4: A first principles approach. Dulles, Va: Mercury Learning and Information, 2012.

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COMSOL for Engineers. Mercury Learning & Information, 2013.

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Book chapters on the topic "COMSOL Multiphysics simulations"

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Khelfi, S., B. Helifa, I. K. Lefkaier, and L. Hachani. "Simulation of Electromagnetic Systems by COMSOL Multiphysics." In Lecture Notes in Networks and Systems, 585–89. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-37207-1_62.

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Murthy, K. S. N., M. Siva Kumar, K. Suma Bindu, K. Satyanarayana, D. Sivateja, and G. Sai Hemanth. "Design and Simulation of Implantable Blood Pressure Sensor Using COMSOL Multiphysics." In Advances in Intelligent Systems and Computing, 1119–26. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-5903-2_117.

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Jerold John Britto, J., A. Vasanthanathan, S. Rajakarunakaran, and R. Prabhakaran. "Numerical Simulation Study on Failure Prediction of FRP Laminate Composite Using COMSOL Multiphysics®." In Springer Proceedings in Energy, 39–51. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4638-9_4.

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Vasudeva, A. M., and H. C. Gururaj. "Electrical Field and Potential Distribution Simulation of 220 kV Porcelain String Insulator Using COMSOL Multiphysics." In Advances in Renewable Energy and Electric Vehicles, 175–88. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-1642-6_14.

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Jerold John Britto, J., A. Vasanthanathan, S. Rajakarunakaran, and R. Venkatesh. "Validation and Verification of FRP Laminate Composite Material Characterization Under Numerical Simulation Using COMSOL Multiphysics®." In Springer Proceedings in Energy, 141–61. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4638-9_12.

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Bajracharya, Sanjeema, and Eiichi Sasaki. "Evaluation of Eddy Current Response Due to the Applied Stress on a Steel Plate Using Phase Diagram." In Studies in Applied Electromagnetics and Mechanics. IOS Press, 2020. http://dx.doi.org/10.3233/saem200008.

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Structural health monitoring of steel structures is crucial for inspection of corrosion and cracking in structural members, compromising their safety and serviceability. In the present study, the prospective of evaluation of change in stress state of structural member due to corrosion and cracking through eddy current based stress measurement is investigated. For this, three-dimensional numerical simulations are carried out in the FE software COMSOL Multiphysics 5.2a for a steel plate subjected to change in relative permeability, representative of change in stress state, whereby the eddy current indices are characterized, including the effects of additional influential parameters namely, lift-off, excitation frequency, and probe size. Phase Diagram is then proposed as a concise method to evaluate the variation of relative permeability and lift-off concurrently in a single graph for an excitation frequency and probe size. It further facilitates the selection of suitable excitation frequency and probe size to conduct the eddy current based stress measurement.
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Shi, Zhongying, and Xia Wang. "Two-Dimensional PEM Fuel Cells Modeling using COMSOL Multiphysics." In Modelling and Simulation. I-Tech Education and Publishing, 2008. http://dx.doi.org/10.5772/5961.

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Ashour, Amira S., Yanhui Guo, and Waleed S. Mohamed. "COMSOL Multiphysics software for ablation system simulation." In Thermal Ablation Therapy, 221–89. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-819544-4.00007-1.

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Cristea, Vasile M., Elena D. Bâgiu, and Paul Ş. Agachi. "Simulation and Control of Pollutant Propagation in Someş River Using COMSOL Multiphysics." In Computer Aided Chemical Engineering, 985–90. Elsevier, 2010. http://dx.doi.org/10.1016/s1570-7946(10)28165-8.

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Li, Linfeng, Yating Yu, Qin Hong, and Zhenwei Wang. "Numerical Investigation on Faults Diagnosis for AC Induction Machine by Magnetic Flux Distribution." In Studies in Applied Electromagnetics and Mechanics. IOS Press, 2020. http://dx.doi.org/10.3233/saem200016.

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AC induction machines are widely used in electric servo drive, information processing, transportation and other fields. However, the unexpected faults cause the serious threat for the normal operation and operator’s safety. Therefore, timely faults diagnosis is an effective way to ensure the AC induction machines to work in health condition. In AC induction machines, magnetic field is the basis of energy conversion of motor, and the faults have the directly influence on the electromagnetic field distribution. In this paper, 2D numerical model of the AC squirrel-cage asynchronous induction machine is built by using COMSOL Multiphysics according to finite element method; Then, the magnetic flux distribution of AC induction motor with three different faults which commonly occurs in engineering are simulated. Base on the numerical simulation, the influence of the different faults on the magnetic distribution is discussed in detail. The investigation is beneficial to find a nondestructive fault diagnosis approach to the induction machine.
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Conference papers on the topic "COMSOL Multiphysics simulations"

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Nordsveen, Marit Ulset, Chi Kwong Tang, and Jarle Gran. "The self-calibrating dual-mode Si detector – Improved design based on Comsol Multiphysics simulations." In CLEO: Applications and Technology. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/cleo_at.2017.ath3b.7.

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Dang, Thanhtrung, and Jyh-tong Teng. "Numerical Simulation of a Microchannel Heat Exchanger Using Steady-State and Time-Dependent Solvers." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-37420.

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Microchannel heat exchangers are employed for thermal management of electronic devices, IC circuits, etc. Simulation of microchannel heat exchangers using solver with the capability of dealing with steady-state and time-dependent conditions is carried out. The solver — COMSOL — was developed by COMSOL Multiphysics, Inc. using the finite element method. The pressure drop and heat transfer are two of the most important parameters in these devices. In this study, the results obtained from the numerical analyses were in good agreement with those obtained from the papers. In addition, using the same heat exchanger configuration, results obtained from numerical simulations of pressure drop and overall thermal resistance using the COMSOL indicated that those parameters are lower for the cases with parallel-flow than those with the counter-flow.
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Manchem, Lakshmi Divya, Malur N. Srinivasan, and Jiang Zhou. "Analytical Modeling of Residual Stress in Railroad Rails Using Critically Refracted Longitudinal Ultrasonic Waves With COMSOL Multiphysics Module." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-38619.

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Assessment of residual stresses in railroad rails without destructing the material plays a vital role in rail road safety. Ultrasonic testing is a commonly used nondestructive technique to determine the stresses in any structure. Ultrasonic stress evaluation technique is based on acoustoelastic effect which refers to the changes in the speed of the elastic wave propagation in a structure undergoing static elastic deformations. Critically refracted longitudinal (LCR) waves can be used as the propagating waves because it is a bulk wave and can reflect the surface and subsurface characteristics by the wave property linked to material elasticity. In this paper, a COMSOL Multiphysics module-based Finite Element Method (FEM) model is developed and numerical simulations are carried out for critically refracted longitudinal wave propagation in a railroad rail head for residual stresses. The time travel data results from this FEM Model are validated with reported experimental results.
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Han, Sangyoon J., and Nathan J. Sniadecki. "Traction Forces During Cell Migration Predicted by the Multiphysics Model." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63843.

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Cells rely on traction forces in order to crawl across a substrate. These traction forces come from dynamic changes in focal adhesions, cytoskeletal structures, and chemical and mechanical signals from the extracellular matrix. Several computational models have been developed that help explain the trajectory or accumulation of cells during migration, but little attention has been placed on traction forces during this process. Here, we investigated the spatial and temporal dynamics of traction forces by using a multiphysics model that describes the cycle of steps for a migrating cell on an array of posts. The migration cycle includes extension of the leading edge, formation of new adhesions at the front, contraction of the cytoskeleton, and the release of adhesions at the rear. In the model, an activation signal triggers the assembly of actin and myosin into a stress fiber, which generates a cytoskeletal tension in a manner similar to Hill’s muscle model. In addition, the role that adhesion dynamics has in regulating cytoskeletal tension has been added to the model. The multiphysics model was simulated in Matlab for 1-D simulations, and in Comsol for 2-D simulations. The model was able to predict the spatial distribution of traction forces observed with previous experiments in which large forces were seen at the leading and trailing edges. The large traction force at the trailing edge during the extension phase likely contributes to detachment of the focal adhesion by overcoming its adhesion strength with the post. Moreover, the model found that the mechanical work of a migrating cell underwent a cyclic relationship that rose with the formation of a new adhesion and fell with the release of an adhesion at its rear. We applied a third activation signal at the time of release and found it helped to maintain a more consistent level of work during migration. Therefore, the results from both our 1-D and 2-D migration simulations strongly suggest that cells use biochemical activation to supplement the loss in cytoskeletal tension upon adhesion release.
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Hale, C., and J. Darabi. "Computational Analysis of a Microfluidic Magnetophoretic Device for DNA Isolation." In ASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/fedsm2018-83482.

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A continuous flow magnetophoretic DNA isolation device was modeled using COMSOL Multiphysics and MATLAB to study and optimize the fluidic flow and geometric parameters of the device. The optimization was performed with the intention of increasing the volumetric flow rate and thus increasing the sample processing capabilities of the device. Key features of the device include oppositely oriented magnets that provide extremely strong magnetic field gradients and improve the capture rate of the magnetic particles. Another feature of the device is a nickel grid arrayed on the bottom surface of the channel to create localized amplified magnetic field gradients, and to provide even spreading and capture of the particles on the bottom surface of the device. These features in conjunction with the optimization of the fluid flow and geometric parameters provide the ability for higher velocity sampling and increased throughput. The simulation was conducted in two steps. First the fluid flow and the magnetic field simulations were performed in COMSOL Multiphysics. Next, the values of velocity fields and magnetic field gradients throughout the computational domain were exported to MATLAB to calculate the motion and trajectory of the particles. The particle trajectory analysis was performed until the particle either reached the bottom of the channel or was not captured within the set length and flowed out to the outlet channel.
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Ozaltun, Hakan, Herman Shen, and Pavel Medvedev. "Finite Element Simulation for Structural Response of U7Mo Dispersion Fuel Plates via Fluid-Thermal-Structural Interaction." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-40759.

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This article presents numerical simulation of dispersion fuel mini plates via fluid-thermal-structural interaction performed by commercial finite element solver COMSOL Multiphysics to identify initial mechanical response under actual operating conditions. Since fuel particles are dispersed in Aluminum matrix, and temperatures during the fabrication process reach to the melting temperature of the Aluminum matrix, stress/strain characteristics of the domain cannot be reproduced by using simplified models and assumptions. Therefore, fabrication induced stresses were considered and simulated via image based modeling techniques with the consideration of the high temperature material data. In order to identify the residuals over the U7Mo particles and the Aluminum matrix, a representative SEM image was employed to construct a microstructure based thermo-elasto-plastic FE model. Once residuals and plastic strains were identified in micro-scale, solution was used as initial condition for subsequent multiphysics simulations at the continuum level. Furthermore, since solid, thermal and fluid properties are temperature dependent and temperature field is a function of the velocity field of the coolant, coupled multi-physics simulations were considered. First, velocity and pressure fields of the coolant were computed via fluid-structural interaction. Computed solution for velocity fields were used to identify the temperature distribution on the coolant and on the fuel plate via fluid-thermal interaction. Finally, temperature fields and residual stresses were used to obtain the stress field of the plates via fluid-thermal-structural interaction.
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Yesilyurt, Serhat. "Modeling and Simulations of Deformation and Transport in PEM Fuel Cells." In ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/fuelcell2008-65258.

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Performance degradation and durability of PEM fuel cells depend strongly upon transport and deformation characteristics of their components especially the polymer membrane. Physical properties of the membrane, such as its ionic conductivity and Young’s modulus depend on its water content, which varies significantly with operating conditions and during transients. Recent studies indicate that cyclic transients may induce hygrothermal fatigue that leads to the ultimate failure of the membrane shortening its lifetime, and thus, hindering the reliable use PEM fuel cells for automotive applications. In this work, we present two-dimensional simulations and analysis of coupled deformation and transport in PEM fuel cells. A two-dimensional cross-section of anode and cathode gas diffusion layers, and the membrane sandwiched between them is modeled using Maxwell-Stefan equations in the gas diffusion layers, Biot’s poroelasticity and Darcy’s law for deformation and water transport in the membrane and Ohm’s law for ionic currents in the membrane and electric currents in the gas diffusion electrodes. Steady-state deformation and transport of water in the membrane, transient responses to step changes in load and relative humidity of the anode and cathode are obtained from simulation experiments, which are conducted by means of a commercial finite-element package, COMSOL Multiphysics.
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Karimi-Moghaddam, Giti, Richard D. Gould, and Subhashish Bhattacharya. "A Non-Dimensional Analysis to Characterize Thermomagnetic Convection of a Temperature Sensitive Magnetic Fluid in a Flow Loop." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-66313.

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This paper presents results from theoretical and numerical studies of a single-phase, temperature sensitive magnetic fluid operating under steady-state laminar flow conditions in a partially heated thermomagnetic circulation loop under the influence of an external magnetic field (created by a solenoid). A one-dimensional theoretical model has been developed using scaling arguments to characterize thermomagnetic circulation in this loop in terms of the geometric length scales, magnetic fluid properties, and strength of the imposed magnetic field. In parallel to this theoretical analysis, supporting numerical simulations using COMSOL Multiphysics simulation software have been undertaken to obtain data for use in this 1D model. A correlation for the non-dimensional heat transfer (Nusselt number) as a function of the appropriate magnetic Rayleigh number and a correlation for the mass flow rate based on the system’s properties are developed.
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Kim, Kyung Chun, and Dong Kim. "Numerical Simulation on the Formation of a Toroidal Microvortex by the Optoelectrokinetic Effect." In ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icnmm2014-21439.

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Optoelectrokinetic effects were effectively used for rapid concentration of particles in microfluidics. In this study, we clarified detail mechanism of particle aggregation by numerical simulation using COMSOL v4.2a multiphysics software. A 3D simulation was conducted with axisymmetric boundary conditions. AC voltage was applied to the two parallel electrodes in a microchannel to generate temperature gradient in the fluids. In addition to the AC electrothermal (ACET) effect, local heating by a laser illumination was also considered. Numerical simulations were carried out for dielectric fluids. A toroidal microvortex induced by the optoelectrokinetic effect shows that fluid motions in the middle of bottom boundary are cancelled out by flows in opposite directions and consequently producing stagnation. It is expected that micro/nano particles can be deposited in the bottom electrode. Local heating by the laser illumination enhanced the intensity of microvortex substantially. It is confirmed that the dominant driving force for the microvortex is natural convection by the laser illumination, however AC voltage is necessary for particle aggregation in the spot area.
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Azarifar, Mohammad, and Nazli Donmezer. "A Roadmap for Building Thermal Models for AlGaN/GaN HEMTs: Simplifications and Beyond." In ASME 2016 Heat Transfer Summer Conference collocated with the ASME 2016 Fluids Engineering Division Summer Meeting and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/ht2016-7383.

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AlGaN/GaN based high electron mobility transistors (HEMTs) have been intensively used due to their high-efficiency power switching and large current handling capabilities. However, the high power densities and localized heating in these devices form small, high temperature regions called hotspots. Analysis of heat removal from hotspots and temperature control of the entire device is necessary for the reliable design of HEMT devices. For accurate analysis of heat transfer using thermal simulations in such devices with heat transfer occurring at different length scales, a roadmap is needed. For this purpose relative importance of different heat transfer modes in removing heat from devices with different substrate materials, operating at different power densities while different boundary conditions are analyzed using two and three-dimensional COMSOL Multiphysics simulations. Results give the relative importance of different parameters on the heat removal mechanism from devices and provide a roadmap for building simpler yet still accurate thermal models for AlGaN/GaN HEMTs and similar devices.
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