• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 74
  • 25
  • 24
  • 12
  • 3
  • 3
  • 3
  • 3
  • 3
  • 3
  • 2
  • 1
  • Tagged with
  • 156
  • 156
  • 66
  • 27
  • 25
  • 25
  • 25
  • 25
  • 24
  • 23
  • 23
  • 20
  • 18
  • 17
  • 17
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
41

Kinetic theory of piston problem and thermal distrurbance by the ellipsoidal statistical model

Chen, Pin-min January 1974 (has links)
Ph. D.
42

The design aspects of a low temperature high pressure plasma wind tunnel

Harri, John Gilgian. January 1962 (has links)
Call number: LD2668 .T4 1962 H37
43

Inelastic gases: a paradigm for far-from-equilibrium systems

Lambiotte, Renaud 29 September 2004 (has links)
<p align="justify">Ce travail consiste à étudier des systèmes constitués par un grand nombre de grains, auxquels de l’énergie cinétique est fournie, et à étudier leurs similarités et leurs différences avec des fluides traditionnels. Je me concentre principalement sur la nature de non-équilibre de ces fluides granulaires, en montrant que, même si les méthodes de méchanique statistique y sont applicables, leurs propriétés sont très différentes de celles de systèmes à l’équilibre ou proches de l’équilibre :</p> <ul><li>Les fluides granulaires présentent des phénomènes de transport qui n’ont pas d’équivalent dans des fluides moléculaires, tels qu’un couplage spécifique entre flux de chaleur et gradient de densité. <li>Leur distribution de vitesse est en général différente de la distribution de Maxwell-Boltzmann, et présente une surpopulation pour les grandes vitesses. <li>Dans le cas de mélanges, différentes espèces de grains sont en général caractérisées par des énergies cinétiques différentes, i.e. ces systèmes sont sujet à une non-equipartition de leur énergie. <li>Ces fluides ont tendance à former des inhomogénéités spatiales spontanément. Cette propriété est illustrée en étudiant l’expérience du Demon de Maxwell appliquée aux systèmes granulaires.</ul> <p align="justify">Chacune de ces particularités est discutée en détail dans des chapitres distincts, où l’on applique différentes méthodes de méchanique statistique (équation de Boltzmann, transition de phase, mean field models…) et où l’on vérifie les prédictions théoriques par simulations numériques (MD, Monte Carlo…).</p>
44

Higher-Order Moment Models for Multiphase Flows Coupled to a Background Gas

Forgues, Francois 25 April 2019 (has links)
Modelling of laminar multiphase flow is extremely important in a wide range of engineering and scientific applications. The particle phases are often difficult to model, especially when particles display a range of sizes and velocities at each location in space. Lagrangian methods can be too expensive and many Eulerian methods, though often computationally more affordable, suffer from model deficiencies and mathematical artifacts that lead to non-physical results. For example, efficient Eulerian models that can accurately predict the crossing of multiple streams of non-interacting particles in laminar flow have traditionally been lacking. The predictive capabilities of modern techniques from the kinetic theory of gases to the treatment of disperse multiphase flows are investigated. In particular, several moment-methods, including a recently proposed fourteen-moment approximation to the underlying kinetic equation describing particle motion, are considered and their abilities to predict particle-stream crossing are assessed. Furthermore, a new polydisperse model has been proposed for treatment of flows that display a range of particles sizes. The proposed model is an extension of the well-known maximum-entropy ten-moment model from rarefied gas dynamics with an addition for the treatment of a range of particle diameters. This model allows for anisotropic variance of particle velocities in phase space and directly treats correlations between particle diameter and velocity. The derivation and mathematical structure, of the proposed models are presented. A fine-volume discretization solution procedure for the resulting moment equations is described and used for performing numerical experiments. Results for flow problems that are designed to demonstrate the fundamental behaviour of each model are presented. It is shown that the new models offer clear advantages in terms of accuracy as compared to traditional Eulerian models for multiphase flows.
45

Formulação cinética para cosmologias com criação de matéria e aplicações / Kinetic Formulation for Cosmologies with Matter Creation and Applications

Raymundo, Iúri Baranov Pereira 23 November 2015 (has links)
Nesta tese, estudamos cosmologias com criação de matéria como alternativa ao modelo $\\Lambda$CDM. Generalizamos a equação de Boltzmann relativística com um termo de produção de partículas fenomenológico, de tal forma que a equação resultante seja capaz de reobter os resultados da termodinâmica de não-equilíbrio das equações de balanço e evolução de temperatura. Após obter o termo correto para a equação generalizada de Boltzmann, investigamos como o formalismo proposto altera a equação de evolução de relíquias cósmicas na presença de criação gravitacional de partículas. / In this thesis, we study matter creation cosmologies as an alternative to the $\\Lambda$CDM model. We generalize the relativistic Boltzmann equation with a phenomenological particle production term, in such a way that the resulting equation will be able to reproduce the non-equilibrium thermodynamics results of the balance equations and temperature evolution law. After obtaining the correct term to the generalized Boltzmann equation, we investigate how the proposed formalism changes the cosmic relic evolution equation in the presence of gravitational particle creation.
46

Kinetic theories of granular flow

Lun, Cliff Ki Keung. January 1985 (has links)
No description available.
47

The effect of magnetic field on the breakdown of gases at microwave frequencies

January 1950 (has links)
Benjamin Lax, W.P. Allis, Sanborn C. Brown. / "June 30, 1950." / Bibliography: p. 16. / Army Signal Corps Contract No. W36-039-sc-32037 Project No. 102B Dept. of the Army Project No. 3-99-10-022
48

Lattice-gas automata and lattice Boltzmann equations for two-dimensional hydrodynamics

Luo, Li-Shi 05 1900 (has links)
No description available.
49

Computer simulation of gas-surface interactions using the Lennard-Jones potential function

Childs, Rand Hampton 05 1900 (has links)
No description available.
50

Thermal diffusion and diffusion in anisotropic binary gas systems / by Robert Donald Trengove

Trengove, Robert Donald January 1984 (has links)
Bibliography: leaves 111-116 / xi, 170 leaves : ill ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, 1984

Page generated in 0.0425 seconds