Exploració per tema "Classificació AMS::80 Classical thermodynamics, heat transfer::80A Thermodynamics and heat transfer"
Ara es mostren els items 1-20 de 27
-
A Caginalp phase-field system based on type III heat conduction with two temperatures
(2016-06-01)
Article
Accés obertOur aim in this paper is to study a generalization of the Caginalp phasefield system based on the theory of type III thermomechanics with two temperatures for the heat conduction. In particular, we obtain well-posedness ... -
A conserved phase-field system based on the Maxwell–Cattaneo law
(2013-06-01)
Article
Accés restringit per política de l'editorialOur aim in this paper is to study a generalization of the conserved Caginalp phasefield system based on the Maxwell–Cattaneo law for heat conduction and endowed with Neumann boundary conditions. In particular, we obtain ... -
Comparison of a size-dependent model for the latent heat of small tin nanoparticles
(Universitat Politècnica de Catalunya, 2016-07)
Projecte Final de Màster Oficial
Accés obertThe classical formulation for the Stefan problem at the nanoscale does not work because the melting temperature and the effective latent heat decrease with the nanoparticle size. In this work, a model for the effective ... -
Continuous dependence and convergence for Moore–Gibson–Thompson heat equation
(Springer Nature, 2023-08)
Article
Accés obertIn this paper, we investigate how the solutions vary when the relaxation parameter, the conductivity rate parameter, or the thermal conductivity parameter change in the case of the Moore-Gibson-Thompson heat equation. In ... -
Decay rates of Saint-Venant type for a functionally graded heat-conducting hollowed cylinder
(2019-05)
Article
Accés obertIn this paper we consider the case of a functionally graded heat-conducting hollowed cylinder. Our purpose is to investigate the consequences of the material inhomogeneity on the decay of Saint-Venant end effects in the ... -
Decay rates of Saint-Venant type for functionally graded heat-conducting materials
(2019-06)
Article
Accés obertThis paper investigates decay rates for the spatial behaviour of solutions for functionally graded heat-conducting materials. From a mathematical point of view, we obtain a new inequality of Poincarétype. This new result ... -
Energy decay in thermoelastic bodies with radial symmetry
(Springer Nature, 2022-06)
Article
Accés obertIn this paper, we consider the energy decay of some problems involving domains with radial symmetry. Three different settings are studied: a strong porous dissipation and heat conduction, a weak porous dissipation and heat ... -
Exponential stability to localized type III thermoelasticity
(2018-11-01)
Article
Accés obertThis paper investigates the system proposed by a wave equation and a heat equation of type III in one part of the domain; a wave equation and a heat equation of type II in another part of the domain, coupled in a certain ... -
Heat transfer at the nanoscale : The hyperbolic heat equation
(Universitat Politècnica de Catalunya, 2015-07)
Treball Final de Grau
Accés obertThe interest of taking technology to increasingly small scales has required great changes and advances in science. In particular, the well-known Fourier's law (very useful in large scales) has proved to be not accurate ... -
Modelització estocàstica en temps continu. Aplicació a les dinàmiques de calor d’un edifici
(Universitat Politècnica de Catalunya, 2020-01)
Treball Final de Grau
Accés obertEn l actual context d emergència climàtica, és necessari analitzar l eficiència energètica dels edificis, incloent les dinàmiques de calor. A més, també cal determinar quins elements poden modificar la temperatura interna ... -
Numerical analysis of a thermoelastic problem with dual-phase-lag heat conduction
(2019-06)
Article
Accés obertIn this paper we study, from the numerical point of view, a thermoelastic problem with dual-phase-lag heat conduction. The variational formulation is written as a coupled system of hyperbolic linear variational equations. ... -
Numerical analysis of some dual-phase-lag models
(2019-01-15)
Article
Accés obertIn this paper we analyse, from the numerical point of view, two dual-phase-lag models appearing in the heat conduction theory. Both models are written as linear partial differential equations of third order in time. The ... -
Numerical modelling of multi-phase multi-component reactive transport in the Earth's interior
(2018-01-01)
Article
Accés obertWe present a conceptual and numerical approach to model processes in the Earth's interior that involve multiple phases that simultaneously interact thermally, mechanically and chemically. The approach is truly multiphase ... -
On a Caginalp phase-field system with two temperatures and memory
(2017-06)
Article
Accés obertThe Caginalp phase-field system has been proposed in [4] as a simple mathematical model for phase transition phenomena. In this paper, we are concerned with a generalization of this system based on the Gurtin-Pipkin law ... -
On existence and numerical approximation in phase-lag thermoelasticity with two temperatures
(2022-04)
Article
Accés obertIn this work we study from both variational and numerical points of view a thermoelastic problem which appears in the dual-phase-lag theory with two temperatures. An existence and uniqueness result is proved in the general ... -
On the Caginalp phase-field systems with two temperatures and the Maxwell–Cattaneo law
(2016-10-31)
Article
Accés obertOur aim in this paper is to study generalizations of the nonconserved and conserved Caginalp phase-¿eld systems based on the Maxwell–Cattaneo law with two temperatures for heat conduction. In particular, we obtain ... -
On the hyperbolic thermoelasticity with several dissipation mechanisms
(Springer Nature, 2023-07)
Article
Accés obertIn this work, we study a two-dimensional problem involving a thermoelastic body with four dissipative mechanisms. The well-known theory proposed by Lord and Shulman is used. The existence and uniqueness of solution is ... -
On the instability, nonexistence and spatial behaviour of the one-dimensional response of a new class of elastic bodies
(2021-05-22)
Article
Accés obertIn this note we consider 1D problems within the context of a new class of elastic bodies. Under suitable conditions on the constitutive equations we prove instability and nonexistence of solutions similar to those in place ... -
On the regularity and stability of three-phase-lag thermoelastic plate
(2022)
Article
Accés obertIn this paper we consider the following three-phase-lag thermoelastic plate u = ¿ ( u ¿ m ); c( _ + q ) = m (u_ + qu ) + (k + + k _): We obtain analyticity and exponential stability for the ... -
Parabolic phase-lag heat conduction theories revisited
(Elsevier, 2022-11)
Article
Accés restringit per política de l'editorialIn this note we show that, under certain conditions on the coe cients, the solutions of the parabolic phase-lag heat conduction models are determined by an analytic semigroup for which the inner product determines the ...