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Dissertations / Theses on the topic 'Comsol'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Moradi, Motlagh Hessameddin. "Evaluation of COMSOL Multiphyscis for rotordynamical analysis." Thesis, KTH, MWL Marcus Wallenberg Laboratoriet, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-119701.

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Rotary machinery systems are widely used in different industries. As they have rotational movements, the resonances will be the function of rotational speed. Nowadays, there are different CAE (Computer Aided Engineering ) softwares that use finite element method to solve complex problems by simplifying the model to a limited DOF (Degree Of Freedom) system. Some of the CAE software have built-in module for rotary machinery to solve eigenvalue problems, unbalance response, stability, etc. COMSOL multiphysics 1 is a CAE software that can deal with structural mechanics. There is not any specific m

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2

Лісовець, С. М. "Використання COMSOL Multiphysics для моделювання роботи акустичного тракту". Thesis, MDPC Publishing, 2021. https://er.knutd.edu.ua/handle/123456789/17353.

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3

Лозінський, Владислав Валентинович. "Моделювання звукопровідної системи середнього вуха людини в Comsol". Master's thesis, КПІ ім. Ігоря Сікорського, 2020. https://ela.kpi.ua/handle/123456789/33851.

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Дослідження слухових властивостей слухової системи людини є актуальною проблемою сьогодення, адже здоровий слух це запорука нормального життя. Серед об’єктивних методів, таких як імпендасометрія, дослідження проводять з застосуванням пневмосистеми, що робить неможливим проведення процедури для немовлят. Саме тому запропоновано дослідження на основі ехо-спектрометру, який є вдосконаленим об’єктивного методу без використання пневмосистеми та з простою процедурою вимірювань і обробки для розширення вікової групи та покращенням точності результатів. При наявності великого спектру можливостей для

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4

Höhn, Tomáš. "Modelování kmitočtově selektivních povrchů v programu COMSOL Multiphysics." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217463.

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Metoda konečných prvků implementovaná v programu COMSOL Multiphysics je využívána k analýze tzv. free-standing kmitočtově selektivních povrchů ve 3D. Tyto modely jsou následně doplněny o periodické okrajové podmínky. Dále jsou free-standing povrchy doplněny o vrstvy dielektrika a je zkoumán jejich vliv na modul činitele odrazu. V analytické části jsou vyhodnoceny vlivy počtu elementů diskretizační mřížky na přesnost výsledku a délku výpočtů. Výsledky jsou srovnávány vzhledem k výsledkům uvedeným v literatuře [5]. V závěrečné části práce je vysvětlen postup při generování m-file pro obdélníkový

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5

Risser, Christophe. "Caractérisation et réalisation d'instruments de détection de gaz par spectrométrie laser photoacoustique." Thesis, Reims, 2015. http://www.theses.fr/2015REIMS001.

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Ce travail présente le développement de spectromètres photoacoustiques pour la mesure de traces de gaz avec des résonateurs de Helmholtz différentiels.La cuve représente le coeur de l'instrument, le laser qui la traverse va créer une onde de pression stationnaire qui sera mesurée par des microphones. Le signal photoacoustique est fonction de la concentration du gaz et la manière dont il sera amplifié va dépendre en grande partie de la géométrie de la cuve. Une méthode aux éléments finis est utilisée pour exprimer cette caractéristique selon les modes et les fréquences propres calculées de la c

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6

Wilow, Viktor. "Electromagnetical model of an induction motor in COMSOL Multiphysics." Thesis, KTH, Elektrisk energiomvandling, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160703.

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Ansys, Flux or COMSOL are examples of software-tools that can be used to study magnetic noise, caused by magnetic forces in the air-gap, in induction motors. The project team wanted to use COMSOL in this thesis. The electromagnetical domain needs to be coupled to the mechanical domain to complete the study. The air-gap forces, calculated in the electromagnetical model using the Rotating Machinery module, can be exported to the Acoustic-Solid Interaction module in COMSOL to enable the vibro-acoustic analysis. An electromagnetical model of an induction motor is developed in two-dimensions in the

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7

Chen, Jie. "Modelling of Laser Welding of Aluminium using COMSOL Multiphysics." Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-284448.

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This thesis presents a modelling approach of laser welding process of aluminium alloy from the thermo-mechanical point of view to evaluate the occurrence of hot cracking based on simulation results and relevant criteria. The model was created stepwise in COMSOL Multiphysics, starting with the thermal model where heat conduction of solid and liquid phase was computed. Then the CFD model was created by involving the driving forces of liquid motion in the weld pool, i.e. natural convection and Marangoni effect. Lastly, the temperature profile calculated by the CFD model was loaded into the mechan

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8

Olofsson, Joel. "Thermo-mechanical analysis of cryo-cooled electrode system in COMSOL." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-353895.

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In the planned linear accelerator called Compact Linear Collider, CLIC, electrons and positrons will be accelerated to velocities near the speed of light. A limiting factor in accelerating structures are vacuum breakdowns, which are electrical discharges from a surface as a result of a large electric field being applied. In the preparatory studies for the CLIC, Uppsala University in collaboration with The European Organization for Nuclear Research, CERN, is building a DC Spark system to analyze vacuum breakdowns. This system containing large planar electrodes will be cooled down all the way do

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9

Ходневич, С. В. "Моделювання електромагнітно-акустичних перетворювачів хвиль Релея в программному комплексі Comsol". Thesis, Сумський державний університет, 2015. http://essuir.sumdu.edu.ua/handle/123456789/41122.

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Останнім часом широко почали використовуватись у неруйнівному контролі безконтактні електромагніто-акустичні перетворювачі - ЕМАП. Проте даний тип перетворювачів має досить низький коефіцієнт перетворення [1]. Його можна збільшити оптимізував конструкцію перетворювача.

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10

Lövgren, Patrick. "Simulering av ett värmesystem i COMSOL Multiphysics : Pipe Flow Module." Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-13212.

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Syftet med detta arbete är att simulera ett värmesystem i COMSOL Multiphysics, Pipe Flow Module, Non-Isothermal Pipe Flow som innehåller ekvationer och randvillkor för att modellera inkompressibel strömning och värmeöverföring i rör. Data om processen och dess komponenter har samlats in från industrin där arbetet är utfört och i vissa fall modifierats för att bättre beskrivas i programmet. Utifrån insamlad data har en modell byggts upp och två simuleringar har gjorts. En stationär för starten av systemet, den har sedan legat till grund för en dynamisk som simulerar förloppet från start till no

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11

Bouilloux-Lafont, Antoine, and Pozo Rubén Noya. "Development of Acoustic Simulations using Parametric CAD Models in COMSOL." Thesis, Linköpings universitet, Maskinkonstruktion, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-157612.

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With constantly changing regulations on emissions, heavy commercial vehicles manufacturershave to adapt for their products to preserve their quality while meetingthese new requirements. Over the past decades, noise emissions have become a greatconcern and new stricter laws demand companies to decrease their vehicle pass-bynoise target values.To address the requirements from different disciplines, Scania follows a simulationdriven design process to develop new concept models EATS. The collaboration amongengineers from different fields is thereby necessary in order to obtain higher performancesi

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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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13

Noya, Pozo Rubén, and Antoine Bouilloux-Lafont. "Development of Acoustic Simulations using Parametric CAD Models in COMSOL." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-263872.

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With constantly changing regulations on emissions, heavy commercial vehicles manufacturers have to adapt for their products to preserve their quality while meeting these new requirements. Over the past decades, noise emissions have become a great concern and new stricter laws demand companies to decrease their vehicle pass-by noise target values. To address the requirements from different disciplines, Scania follows a simulation driven design process to develop new concept models EATS. The collaboration among engineers from different fields is thereby necessary in order to obtain higher perfor

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14

Júnior, Marco Antônio Vasiliev da Silva. "Estudo experimental e modelagem matemática da secagem convectiva de fatias de gel de amido-alginato." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/74/74133/tde-22102018-164651/.

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Os biopolímeros comestíveis, tais como amido e alginato, podem ser utilizados na formulação de géis com elevada capacidade de retenção de água. A secagem convectiva pode ser utilizada para a remoção da umidade em géis. Os parâmetros da secagem (temperatura, velocidade do ar e umidade de equilíbrio) necessitam ser monitorados para a produção de um sólido seco e sem degradação de compostos ativos. A modelagem matemática da secagem pelo método numérico de elementos finitos em COMSOL Multiphysics tem sido utilizada para simular a secagem, usando um número reduzido de ensaios experimentais. Este tr

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15

Bapat, Nikhil D. "Development of Sound Presentation System (SPS) for Characterization of Sound Induced Displacements in Tympanic Membranes." Digital WPI, 2011. https://digitalcommons.wpi.edu/etd-theses/1187.

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The conventional methods for diagnosing pathological conditions of the tympanic membrane (TM) and other abnormalities require measuring its motion to an acoustic excitation for its use in a clinical environment. To obtain comprehensive quantitative diagnostic information from the motion of the entire surface of the TM, it is necessary to devise an integrated system capable of accurately recording the motion and induce an acoustic stimulus. To accomplish this goal, a sound presentation system (SPS) capable of impinging acoustic stimulus in the frequency range of 20Hz to 8 kHz at known amplitude

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16

Dumortier, Mikaël. "Modélisation numérique des transferts de matière, de chaleur et électrochimiques au sein d'un électrolyseur haute température." Thesis, Montpellier 2, 2013. http://www.theses.fr/2012MON20127/document.

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L'électrolyse haute température de l'eau à l'aide de membranes en céramique conductrice de protons est un processus intéressant pour la production d'hydrogène. Ce processus, qui peut être effectué sans catalyseurs nobles, produit de l'hydrogène pur et nécessite moins d'électricité que l'électrolyse classique à basse température. Le développement futur de ces réacteurs à membrane nécessite des efforts accrus sur la simulation numérique afin d'optimiser la chaleur et les transferts de masse ainsi que la conception de cellules d'électrolyse. Ce travail présente un ensemble d'équations sélectionné

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17

Vicario, Gaia. "Analisi acustica di una finestra forata: modellazione numerica mediante COMSOL multiphysics." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.

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“Immaginate di potervi rilassare a casa in una giornata d’estate tenendo le finestre aperte per lasciare passare la brezza ma senza essere disturbati dai rumori della città, oggi è possibile”. Quello che voglio fare attraverso questa tesi è di studiare la fattibilità per la realizzazione di una finestra che permetta il passaggio dell’aria ma non dei rumori. L’idea di questa particolare finestra silenziosa mi è stata fornita dallo studio fatto dal professor Sang-Hoon Kim del Mokpo National University maritime e dal professor Seong-Hyun Lee del Korea Institute of Machinery and Materials in C

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18

Bergman, Emma. "Designing Thermal Management Systems For Lithium-Ion Battery Modules Using COMSOL." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-241899.

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In this thesis, a section of a lithium ion battery module, including five cells and an indirect liquid cooling system, was modelled in COMSOL Multiphysics 5.3a. The purpose of this study was to investigate the thermal properties of such a model, including heat generation per cell and temperature distribution. Additionally, the irreversible and reversible heat generation, the cell voltage and the internal resistance were investigated. The study also includes the relation between heat generation and C-‐rates, and an evaluation of COMSOL Multiphysics 5.3a as a software. It was found that having

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Лісовець, С. М. "Застосування COMSOL Multiphysics 5.6 при здійсненні неруйнівного акустичного контролю текстильних матеріалів". Thesis, Херсонський національний технічний універсітет, 2021. https://er.knutd.edu.ua/handle/123456789/17835.

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Erlandsson, Simon. "Evaluation, adaption and implementations of Perfectly Matched Layers in COMSOL Multiphysics." Thesis, KTH, Numerisk analys, NA, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-280757.

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Perfectly matched layer (PML) is a commonly used method of absorbing waves at a computational boundary for partial differential equation (PDE) problems. In this thesis, methods for improving the usability of implementations in Comsol Multiphysics is addressed. The study looks at complex coordinate stretching PMLs in the context of Helmholtz equation using the finite element method (FEM). For a PML to work it has to be set up properly with parameters that takes into account the properties of the problem. It is not always straight forward. Some theory behind PMLs is presented and experimentation

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Dahanayake, Rasika Bandara Sepala Dahanayake. "Simulations Of Step-Like Bragg Gratings In Silica Fibers Using COMSOL." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1461932413.

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Ang, Keng Lin (Jason). "Investigation of rheological properties of concentrated milk and the effect of these properties on flow within falling film evaporators." Thesis, University of Canterbury. Chemical and Process Engineering, 2011. http://hdl.handle.net/10092/6720.

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The falling film flow of milk was studied both analytically and experimentally. Experiments were carried out for concentrations from 19.93% to 62.09% to obtain the rheological data of milk while analytical studies were done to derive the solutions of the problem. Studies which include calculations and simulations were carried out for a typical milk flow in a falling film evaporator. It was found that milk was non-Newtonian at high concentrations and Herschel-Bulkley model was able to model the milk flow. The typical falling film flow was able to be simulated as a two phase flow in COMSOL to g

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Gonzales, Valentina, and Henrietta Åberg. "Seepage, stability and pollution transport of an upstream tailing dam with COMSOL." Thesis, KTH, Mark- och vattenteknik (flyttat 20130630), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-171864.

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In the early years of the 20th century the first tailing dams were constructed, the upstream tailing dam being the first type. Before this the tailings were disposed in the nearest stream or river. This caused legal issues between farmers and the mining companies, which ended the random discharge of the tailings. During the 20th century many tailing dams collapsed raising questions whether the technology is sufficient and safe. The known failures are just a fraction of the actual number since not all failures are documented. If a tailing dam were to break the consequenses could be fatal not on

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Nyberg, Jesper. "Flow Distribution in Brazed Plate Heat Exchangers : A Parameter Study in COMSOL." Thesis, Karlstads universitet, Institutionen för ingenjörs- och kemivetenskaper, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-43533.

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Lubricants and liquid cooling are used in many industrial applications to ensure reliability and longevity of machinery. Oil cooling of both electrical and mechanical applications is of interest since oil is better suited for electrical applications than water and already available in the system as a lubricant. Brazed plate heat exchangers (BPHEs) have many advantages compared to other heat exchanger types commonly used in oil cooling applications. Flow maldistribution inside BPHEs can arise with highly viscous fluids like oil. Since flow is hard to measure when plate heat exchangers are braze

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Liljestrand, Simon, and Viktor Lundell. "Fuktkontroll av en ventilerad platta på mark : Modellering i COMSOL Multiphysics 5.5." Thesis, Högskolan i Gävle, Avdelningen för byggnadsteknik, energisystem och miljövetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-32653.

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Krypgrunder i någon form har använts som grundkonstruktion i Sverige under långtid. Förr var det torpargrunder som med tiden blev isolerade krypgrunder och plintgrunder. Gemensamt för krypgrundskonstruktioner som är ventilerade med utomhusluft är att under sommarhalvåret blir det förhöjda relativa ånghalter. Syftet med fallstudien är att studera en uteluftsventilerad konstruktion med välisolerat bjälklag och markisolering. Konstruktionen är nedgrävd och ventilationen i grunden sker via en tunn spalt under marknivå. Luftspaltens temperatur och relativa ånghalt är av intresse för att avgöra om d

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Sprainys, Kęstutis. "Srities diskretizavimo baigtiniais elementais galimybių tyrimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20141031_084212-60756.

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Šiame darbe buvo analizuojama programinė įranga skirta diskretizuoti sritį į baigtinius elementus. Analizuotos MATLAB sistemos ir COMSOL programos diskretzavimo galimybės. Sukurta programa sujungianti COMSOL ir MATLAB, kuri leidžia diskretizuoti sritį į baigtinius elementus.<br>In this work was done study of software for domain discretization by finite elements. Created program that connects MATLAB and COMSOL, which allows domain discretization by finite elements.

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Pla, Rubio Begoña. "The bearing capacity of Nordic soil." Thesis, KTH, Maskinkonstruktion (Inst.), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-175893.

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Heavy forestry machines have great immediate effect on soil properties. This increases the interest to develop approaches that help understanding better the interaction between the forest machines and the terrain and consequently develop the forwarders to be gentle to the environment. The most predominant indications of soil disturbances caused by harvesting are mainly rutting and soil compaction. It is critical to understand and evaluate these damages to be able to protect the remaining trees and improve their tree growth rate. Comprehending the bearing capacity of the soil and the interactio

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Karlsson, Fredrik, and Samuel Mani. "Beräkning och sammanställning av linjära köldbryggor : En jämförelse mellan HEAT2 och COMSOL Multiphysics." Thesis, KTH, Byggvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-174115.

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I dagens samhälle ligger stort fokus på att bygga miljövänliga och energieffektiva byggnader. För att möta de allt mer skärpta energikraven måste hela klimatskalet beaktas där köldbryggor utgör en betydande del. Examensarbetet går ut på att göra en sammanställning av linjära köldbryggor (ψ) för vanligt förekommande konstruktionsdetaljer där köldbryggor finns. Sammanställningen där olika isoleringsmaterial på fasadskiva och isolertjocklekar tabelleras, ska underlätta för framtida projektering. Två simuleringsprogram för beräkning av köldbryggor har jämförts och utvärderats med varandra. Utvärde

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Jeništa, Petr. "Optimalizace metody měření magnetické susceptibility." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-218874.

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The aim of this thesis is measure the specimens placed in field of MR tomograph, the measured data to evaluace the process and measurement errors. The theoretical part is focused on describing basic parameters of magnetic field, commissioning some older methods of measurement and design methods for the measurement of samples not issuing MR signal. There is performed modeling for the proposed Metod and the 1D, 2D and 3D environments using COMSOL Multiphysics. The practical part is the measurements samples in the tomograph the Institute of Scientific Instruments Academy of Science in Brno. The m

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Potrymai, Eduard, and Ivan Perstnov. "Time Dependent Modelling and Simulation of the Corona Discharge in Electrostatic Precipitators." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-33293.

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Corona discharge is one of the crucial problems related with high-voltage equipment. This paper focuses on the physical and numerical modelling of corona discharge in an Electrostatic precipitator (ESP). The model is based on Maxwells equations and the Finite element method (FEM) and is implemented with the COMSOL Multiphysics software.The simulation allows studying the electric charge distribution and the behaviour of the electric field inside the ESP. The work is focused primarily on time-dependent studies of the corona discharge.

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Jomy, Vachaparambil Kurian. "An analytical and numerical study of droplet formation and break-off for jetting of dense suspensions." Thesis, KTH, Mekanik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-194501.

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The jet printing of solder paste from a uid dynamics perspective involves viscosity change due to varying shear rate and eventual break o of the ejected solder paste droplet from the uid in the printer head. The ability to model the jetting process in a simulation package is important as it can be used as a tool for future development of the jetting device. The jetting process is modelled as a two phase (air - solder paste) ow with interface tracking performed using phase eld method and temporal stepping based on a second-order Backward Di erence Formula with relaxed tolerences. This thesis in

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Jara, Heredia Daniel. "Improvement of the numerical capacities of simulation tools for reactive transport modeling in porous media." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S036/document.

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La modélisation du transport réactif dans les milieux poreux implique la simulation de plusieurs processus physico-chimiques : écoulement de phases fluides, transport de chaleur, réactions chimiques entre espèces en phases identiques ou différentes. La résolution du système d'équations qui décrit le problème peut être obtenue par une approche soit totalement couplée soit découplée. Les approches découplées simplifient le système d'équations en décomposant le problème sous-parties plus faciles à gérer. Chacune de ces sous-parties peut être résolue avec des techniques d'intégration appropriées.

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Johansson, Petter. "Advanced Thermal Energy Storage Heat Transfer Study with Use of Comsol and Matlab." Thesis, KTH, Energiteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-44472.

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The interest in storing latent energy in phase change materials has risen over the last years as the need grows for more energy efficient systems. By storing energy, free chilling and heat can be saved for later use during high load hours. Thus the gap between supply and load can be overcome. It is an efficient way to provide both cooling and heating to buildings using phase change material (PCM) as they take up much less volume compared to a corresponding water-cistern with the same amount of stored energy. Low thermal conductivity of most of the PCMs can be compensated with advanced heat tra

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Cedell, Olle, and Elias Ljunggren. "Dimensionering av varmvattenavstick för att undvika Legionellatillväxt : En simuleringsstudie utförd i COMSOL Multiphysics." Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-281994.

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Bakterien Legionella pneumophila orsakar sjukdomen Legionella vilket har ökat i världen de senaste 20 åren och har troligtvis ett ännu större mörkertal. Den frodas i vattenrör mellan temperaturen 25–50 grader och vid installation av varmvattenrör i byggnader måste det tas hänsyn i riskzoner. Ett speciellt riskområde är varmvattenavstick som skapas för att kunna dra vidare vattenrör i framtiden. Där utsätts vattnet för större risk för stillastående och sjunkande temperaturprofil beroende på längd. Med hjälp av COMSOL Multiphysics® Modelling Software har ett teoretiskt ram

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Dahlin, Linus, and Marcus Hedman. "Undersökning av värmeförluster genom kantbalk vid användning av golvvärme : En simuleringsundersökning i COMSOL Multiphysics." Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-27163.

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I Sverige ställs allt högre krav på nya byggnader genom bestämmelser och lagar som påverkar energianvändningen. Byggnader kan värmas upp med hjälp av olika typer av distributionssystem såsom radiatorer och golvvärme. Värmebehovet hos byggnaden baseras på hur mycket värmeenergi som behövs för att uppnå termisk komfort. För att begränsa energianvändningen används isolering i syfte att minimera värmeförlusterna genom byggnadens klimatskärm. Denna undersökning syftar till att undersöka förluster som sker genom kantbalken vid användning av vattenburet golvvärmesystem och hur dessa förluster påverka

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Pavani, Marília Gusman Thomazi. "Estudo experimental e simulação da fluidodinâmica de amido de milho em leito fluidizado pulsado." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/74/74133/tde-26092016-163234/.

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A fluidização é uma operação unitária presente nas indústrias química, farmacêutica e alimentícia. Durante a fluidização, o leito de partículas sólidas é suspenso por um fluxo ascendente de gás. A velocidade mínima de fluidização indica a menor velocidade do gás em que as partículas iniciam a agitação, enquanto a velocidade terminal é caracterizada pela elutriação, ou arraste de partículas juntamente com o gás. Portanto, um leito fluidizado deve operar em uma velocidade de gás que esteja entre a velocidade mínima de fluidização e a velocidade terminal de arraste. No entanto, os sólidos particu

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Zhang, Zhengyu. "Laser-Induced Nucleation in a Coaxial Microfluidic Mixer." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLN023.

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La cristallisation est une des opérations élémentaires du génie chimique. Les matières produites sont extraites par cristallisation et purifiées par recristallisation. Mais la nucléation du cristal reste un mystère et la théorie classique de la nucléation est battue en brèche par de nombreuses données expérimentales. Nous avons construit un dispositif microfluidique de précipitation par mélange de solvants pour produire de manière continue et observer la formation d’un grand nombre de cristaux. La molécule étudiée est le DBDCS dont les cristaux sont fluorescents mais pas la molécule. Le germe

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Flaux, Pierrick. "Measurement of the neutron electric dipole moment at the Paul Scherrer Institute : production of magnetic fields." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMC222/document.

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Le travail réalisé au cours de cette thèse concerne le développement du système de bobines de l'expérience n2EDM à l'Institut Paul Sherrer (PSI). Le but de cette expérience est de mettre en évidence de nouvelles sources de violation CP à travers la mesure du moment dipolaire électrique du neutron. L'actuelle limite supérieure sur la mesure de nEDM, $2.9 \cross 10^{-26}$ e.cm (90\% C.L.) à été obtenue par la collaboration RAL-Sussex-ILL en 2006.L'expérience n2EDM vise à améliorer d'un ordre de grandeur la sensibilité statistique en gardant sous contrôle les effets systématiques. Cela requiert l

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Sawant, Ronit Prasad. "COMSOL Multi-physics model for Transition Metal Dichalcogenides (TMD’s)-Nafion composite Based Electromechanical Actuators." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-theses/1261.

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The ability to convert electrical energy into mechanical motion is of significant interest in many energy conversion technologies. For more than a decade Ionic polymer-metal composite (IPMC) as an electroactive smart polymer material has been extensively studied and has shown great potential as soft robotic actuators, artificial muscles and dynamic sensors in the micro-to-macro size range. IPMC consists of an ion exchange polymer membrane sandwiched between two noble metal electrodes on either side of the membrane. Under applied potential, the IPMC actuator results in bending deformation becau

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Jahan, Israt. "Implementation and experimental evaluation of a parameterized PMSynRM model using Matlab and Comsol Multiphysics." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-265782.

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This thesis focuses on modelling of the permanent magnet synchronous reluctancemotor (PMSynRM), which has drawn considerable attention by researchers thanks toits high efficiency and wide range of speed operation. Comparisons with measurementsfrom a four-pole PMSynRM with four barriers and 24 stator slots have been carriedout. In this thesis work, Matlab and Comsol Multiphysics are used to implement theparameterized PMSynRM model.Models of the PMSynRM in two-dimensions (2D) and three-dimensions (3D) havebeen implemented. The electromotive force (back emf) at no load condition for a fullpitchan

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Willis, Rachel E. "Empirical Validation of an In Silico Model Predicting the Fluid Dynamics of an Iliac Artery Aneurysm." DigitalCommons@CalPoly, 2016. https://digitalcommons.calpoly.edu/theses/1576.

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Iliac artery aneurysms are considered rare and difficult to detect and treat. Prompt diagnosis and timely intervention are essential, because the incidence of rupture is as high as 50%. The reported mortality rate for patients who undergo surgery for ruptured iliac artery aneurysm ranges from 50% to 70%. This study developed an in-vitro mechanical model of an iliac artery aneurysm to verify the accuracy of computer simulation software. Both the in vitro model and the in silico model can be used for further research to develop better treatment technology. This study also looks at the different

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Masár, Lukáš. "Laboratorní a počítačové modelování difúze nízkomolekulových látek v gelových nosičích." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2011. http://www.nusl.cz/ntk/nusl-216767.

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This diploma thesis is focused on combination of experimental study and computer modelling of diffusion processes in gel phases. The aim of experimental part of the diploma thesis was to test and optimize the setting of the diffusion coefficient in gel medium by using the method of horizontal diffusion cells, commonly used for study of diffusion processes through membranes. Specific description of experiments was to determinate the impact of presence of reactive component in inert hydro-gel carrier on final value of diffusion coefficient of low-molecular model diffusion probe. The defined depe

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McLeod, Angus R. "Characterisation of gold nanoparticles on substrate." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/80106/5/Angus_McLeod_Thesis.pdf.

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This thesis investigated the interaction between light and gold nanoparticles, for gold nanoparticles sitting on a variety of surfaces. The work was both experimental and theoretical in nature. Using a custom designed experimental set-up we were able to probe the interaction of light with individual nanoparticles. We were also able to predict the interaction of light with gold nanoparticles sitting on graphene substrates. The work presented lays the groundwork for more extensive investigation of surfaces enhanced by the addition of gold nanoparticles.

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Bordoni, Lorenzo. "Studio e realizzazione di provini piezoelettrici flessibili per applicazioni di sensoristica." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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L’obiettivo del progetto europeo MyLeg è quello di realizzare una nuova generazione di protesi transfemorali motorizzate che possano essere utilizzate in modo intuitivo e affidabile. L’aspetto innovativo riguarda la presenza di un impianto osteointegrato e di sensori mioelettrici impiantabili su muscoli innervati per estendere le capacità cognitive dell’utente, aumentando la percezione della gamba protesica e la capacità di movimento. Il lavoro di Tesi si focalizza su uno dei tantissimi aspetti del progetto, che riguarda lo sviluppo di un sensore piezoelettrico flessibile da integrare nella p

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Paulsson, Johan. "Simulering av ändrad flödesriktning vid kylning av frukt : Med avseende på minskade nedkylningstider och uniformitet." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-28739.

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Lu, Kang. "Modelling of Multicomponent Diffusion and Swelling in Protein Gels." Thesis, University of Canterbury. Chemical and Process Engineering, 2011. http://hdl.handle.net/10092/5250.

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Some protein gels are products of the dairy industry and some are used as pH-sensitive gels for the controlled delivery of biologically active substances. To understand the dynamics of drug delivery it is very important to establish a mathematical model of protein gel swelling. This required the identification and integration of theory and equations from a wide range of topics. The aim of this research was to develop a mathematical model of transport in polyelectrolyte gels (using the example of β-lactoglobulin protein gels). A complete mathematical model of protein gel swelling was establis

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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. T

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Freeman, Gregory Edward. "Low Temperature Calorimetry and Alkali-Activated Slags." Digital WPI, 2014. https://digitalcommons.wpi.edu/etd-theses/1181.

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The American Society of Civil Engineers’ (ASCE’s) “2013 Report Card for America’s Infrastructure” estimated that “32% of America’s major roads are in poor or mediocre condition.” An estimated $100 billion dollars are needed to maintain that condition, and an additional $79 billion is needed to improve the quality of American roadways to an acceptable level. In many regions around the US, the service lives of concrete pavements are limited by the damage caused by freezing and thawing of pore solution inside the pavements. Alkali-activated slags (AAS) are produced from ground granulated blast fu

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Thunell, Rasmus. "Groundwater flow paths in fractured crystalline bedrock : Electromagnetic VLF measurements and modelling of a groundwater basin in Svanberga, Sweden." Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231983.

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Sweden is a country with a relatively high number of private wells, where about 1.2 million inhabitants in permanent housing and an equal amount in summer housing relies on private wells as their drinking water supply. At the same time the market for drinking water treatment products is unregulated regarding quality and requirements are needed. A testing facility with the aim of providing quality certifications as well as sustainability- and efficiency- tests of small scale drinking water treatment techniques is under development and located in a decommissioned groundwater treatment plant in S

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Болюх, Владимир Федорович, та Александр Иванович Кочерга. "Трехмерное моделирование распределения вихревых токов в ферромагнитной пластине". Thesis, НТУ "ХПИ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/22126.

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