Dissertations / Theses on the topic 'Lattice conduction'
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Yamamoto, Kazuhiro. "Boundary Conditions for Combustion Field and LB Simulation of Diesel Particulate Filter." Global Science Press, 2013. http://hdl.handle.net/2237/20029.
Full textNakamura, Masamichi, and Kazuhiro Yamamoto. "Simulation of heat conduction and soot combustion in diesel particulate filter." Inderscience publishers, 2012. http://hdl.handle.net/2237/20055.
Full textNouri, Moudhaffar. "Simulation numérique directe des transferts de chaleur et de masse dans les milieux hétérogènes Enthalpic lattice Boltzmann formulation for unsteady heat conduction in heterogeneous media." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASC032.
Full textThe characterization of heterogeneous media is at the heart of energy efficiency. Nowadays, the use of numerical simulation is in full development to partially replace the tedious experimental work required for characterization. The theory of upscaling makes it possible to study heat and mass transfers on a macroscopic scale masking heterogeneities by using fictitious parameters called effective properties. All these classical methods assume the presence of local equilibrium between the different phases of the medium. Yet, The validity of this hypothesis is not assured for several configurations that are quite common in practice (heterogeneous media with contrasting thermophysical properties, structuring in conductive and storage phases, etc.). Commonly, other approaches, such as multi-scale modeling or macroscopic model with memory effects, are used for these cases. Beyond these models which remain limited to certain morphologies/properties, heterogeneity scale modeling by direct numerical simulation (DNS) is a universal method applicable for any heterogeneous media, within the limit of the size accessible with current tools (3D imaging and computational resources).This thesis work is in line with this approach and proposes a set of works carried out on the scale of heterogeneities to study heat and mass transfer phenomena. For the study of isolated heat transfer phenomena, the emerging Lattice Boltzmann (LB) method was chosen. This method is known for its facility of programming and its suitability for high-performance computing. However, its standard thermal version (Thermal Lattice Boltzmann-TLBM) is unable to deal with transient heat transfer with heterogeneity of the thermal inertias of the medium phases. Two methods are proposed to extend it for this case. The first LB model is based on a correction by adding a source term depending on the different inertias of the phases of the medium. This term is expressed in the form of a thermal flux and discritized by finite differences. In the same approach, a second model has been developed in order to preserve the locality properties of the LB method. A modified LB balance is proposed to take into account the local thermal inertia without any modification to the structure of the method other than the introduction of a second one-component distribution function.For coupled multiphysical heat/mass/momentum transfers in complex media, the finite volume method, known for its reliability and robustness, has been chosen. The formulation developed is based on Navier-Stokes equations in the presence of coupled transfer phenomena: mixing flow, phase change, sorption, thermal and mass diffusion. It is therefore a very comprehensive formulation. Solving techniques adapted to the strong non-linearity and coupling of the discretized system are used. The ILU-BiCGStab solver and the relaxation method were used to ensure a stable and efficient resolution of the system of equations.A sample resolution is provided at the end of the manuscript. This work is therefore ready to take advantage of the latest advances in materials science, both in terms of the fabulous 3D imaging possibilities and the power of High Performance Computing (HPC)
Mabboux, Pierre-Yves. "Relaxation nucléaire dans les polymères conducteurs : application à l'étude de la conduction microscopique et développements théoriques." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0172.
Full textCorallini, Serena. "Structure and dynamics of a new Brownmillerite compound Sr₂₋ₓBaₓScGaO₅ in view of possible application as oxygen ion electrolite at moderate temperature." Thesis, Rennes 1, 2013. http://www.theses.fr/2013REN1S172.
Full textOxygen ion conductors operating at low temperature, below 300 ° C, are materials of major interest for several applications in the area of solid state ionicsas solid fuel cells, batteries, electrodes, sensors, catalysts, etc. However till now, the solid oxygen ion conductor works reasonably only at high temperatures above 800 ° C, which limits their application. In the search for improved oxygen ion conductors Brownmillerite structures ( ABO2.5 eq. A2B2O5 ) has always played an important role, especially in the low temperature regime where the dynamics of the tetrahedral chain induced mobility of oxygen. In this context, we have synthesized a new phase Sr1-xBaxScGaO5 with x = 0 (SSGO) and x = 0.1 (SBSGO) containing diamagnetic 3d0 ions to have a pure ion conductor. Depending on the synthesis route, the compound has two polymorphs, orthorhombic and cubic, which are both important for the oxygen conductivity. The reaction in the solid state leads to an orthorhombic Brownmillerite-type structure, while tmeling synthesis (using the Travelling Floating Zone method FTZ ) gives an oxygen-deficient Perovskite structure. The structures of both polymorphs were analyzed using the neutron powder diffraction as function of the temperature (D2B@ILL). A detailed analysis of SSGO Brownmillerite type shows that the Sc occupies octahedral sites, while the Ga occupies exclusively the tetrahedral ones. This cation ordering is unusual for the Brownmillerite structures. Moreover Sr2-xBaxScGaO5 undergoes a phase transition from an ordered configuration of the tetrahedral chains (GaO4) characteristic of I2mb space-group at room temperature, toward a disordered one characteristic of Imma space group (500 ° C). This important result confirms that the disorder of the tetrahedral chains is dynamic and it is the key to have oxygen ion conductor at moderate temperatures. Synthesis at elevated temperatures (up to melting point) gives a cubic structure Pm ̅m, stable up to 1000 ° C. The Perovskite -type structure is highly oxygen deficient. The mobility of the oxygen of these new compounds was studied by thermogravimetry analysis (TGA) coupled with mass spectrometry (MS) after the isotope exchange 18O-16O, by Raman and NMR spectroscopy coupled with theoretical ab-initio calculations (WIEN2k), by inelastic neutron scattering (IN6@ILL) coupled with calculations of ab-initio molecular dynamics (VASP ) . The results obtained from the structural and the lattice dynamics studies show that activation of the ion mobility is related to the transition to a disordered structure Imma, which implies an important dynamics of the chains GaO4 and the diffusion along the one-dimensional vacancy channel. These results have been reproduced by molecular dynamics calculations, in which the diffusion pathway is due only to the oxygen in the tetrahedral planes
Tomeno, Shinya. "Experimental Study of Organic Triangular Lattice Quantum Spin Liquids." Kyoto University, 2020. http://hdl.handle.net/2433/254505.
Full textYamaga, Kazuki. "Conduction and diffusion of Fermi particles on lattices -from the standpoint of nonequilibrium statistical mechanics-." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263654.
Full textShaw, Cynthia Kit Man. "Mass transport in mixed conducting perovskite related oxides." Thesis, Imperial College London, 2001. http://hdl.handle.net/10044/1/8380.
Full textShimizu, Yasuhiro. "NMR study of spin liquid, Mott transition and superconductivity on the triangular-lattice organic conductor κ-(ET)2Cu2(CN)3." 京都大学 (Kyoto University), 2005. http://hdl.handle.net/2433/145109.
Full textPrabhakar, Tejas. "Study of Earth Abundant TCO and Absorber Materials for Photovoltaic Applications." University of Toledo / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1382269621.
Full textBeau, Bénédicte. "Relaxation nucléaire dans un polymère conducteur à comportement métallique, la polyaniline." Université Joseph Fourier (Grenoble), 1998. http://www.theses.fr/1998GRE10240.
Full textYang, Chen-yuch, and 楊鎮嶽. "Lattice Model Studies of Synchronization between Two Kinetic Oscillatory Catalysts via Thermal Conduction." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/34640453290839197568.
Full text國立中正大學
化學所
93
Abstract Monte-Carlo technique is applied to simulate the synchronization of kinetic oscillation via thermal conduction between two nano-scaled supported platinum particles. The kinetic oscillation is produced by carbon monoxide oxidation with subsurface oxygen formation and removal. The effects of distance between the two particles, heat dissipation efficiency and thermal conduction efficiency are investigated. The synchronization is destroyed when the distance is seven-fold longer of one platinum particle size. Heat dissipation has an opposite influence on synchronization comparing to thermal conduction. While decreasing heat dissipation from the substrate to the environment promotes the synchronization, decreasing thermal conduction efficiency isolates each oscillatory particle.
Trots, Dmytro M. "Structure and Lattice Dynamics of Copper- and Silver-based Superionic Conducting Chalcogenides." Phd thesis, 2007. https://tuprints.ulb.tu-darmstadt.de/862/1/thesis_trots_1.pdf.
Full textRajevac, Vedran. "Lattice dynamics in Hydrogenated Austenitic Stainless Steels and in the Superionic Conductor Cu 2-δ Se." Phd thesis, 2005. https://tuprints.ulb.tu-darmstadt.de/523/1/thesis1.pdf.
Full textTrots, Dmytro M. [Verfasser]. "Structure and lattice dynamics of copper- and silver-based superionic conducting chalcogenides / vorgelegt von Dmytro M. Trots." 2007. http://d-nb.info/98530166X/34.
Full textRajevac, Vedran [Verfasser]. "Lattice dynamics in hydrogenated austenitic stainless steels and in the superionic conductor Cu2-δSe [Cu 2-delta Se] / by Vedran Rajevac." 2005. http://d-nb.info/973919396/34.
Full textSingh, Kshetrimayum Jugeshwar. "NMR Relaxation And Charge Transport In Conducting Polymers." Thesis, 2009. http://hdl.handle.net/2005/916.
Full textShamin, Saquib. "Electrical Transport in Si:P and Ge:P δ-doped Systems." Thesis, 2015. http://etd.iisc.ernet.in/2005/3915.
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