Browsing by Subject "Calor--Transmissió"
Now showing items 1-20 of 20
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A level-set model for thermocapillary motion of deformable fluid particles
(2016-12-01)
Article
Open AccessA new level-set model is proposed for simulating immiscible thermocapillary flows with variable fluid-property ratios at dynamically deformable interfaces. The Navier–Stokes equations coupled with the energy conservation ... -
A parallel finite-element framework for the thermal analysis of metal additive manufacturing with powder methods
(Universitat Politècnica de Catalunya, 2016-10-21)
Master thesis
Restricted access - author's decisionVirtual design process and validation of products built with metal additive manufacturing technologies with powder methods is not possible without a coupled thermomechanical numerical analysis tool that is capable of ... -
An introduction to parallel in time discretization of transport equations
(Universitat Politècnica de Catalunya, 2021-07)
Master thesis
Restricted access - confidentiality agreement
Covenantee: Barcelona Supercomputing CenterParallel in time integration methods is an interesting field of study, because of its new direction over parallelize. That is, when parallelization in space becomes saturated, the time direction becomes a new way in which ... -
Analysis of CO2 Power Cycle Heat Exchangers
(Universitat Politècnica de Catalunya, 2022-05-18)
Master thesis
Open AccessThe CO2 power cycle has gained attention as an alternative to the classical Rankine and Brayton cycles during this transition to sustainable energy production from the current available methods that have a prime share of ... -
Comparison of a size-dependent model for the latent heat of small tin nanoparticles
(Universitat Politècnica de Catalunya, 2016-07)
Master thesis
Open AccessThe 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 ... -
Computational fluid dynamics modeling of impinging gas-jet systems: I. Assessment of eddy viscosity models
(2005-07-15)
Article
Restricted access - publisher's policyComputational fluid dynamics plays an important role in engineering design. To gain insight into solving problems involving complex industrial flows, such as impinging gas-jet systems (IJS), an evaluation of several eddy ... -
Experimental study of heat transport in fractured network
(2015-07-01)
Article
Open AccessFractured rocks play an important role in transport of natural resources through subsurface systems. In recent years, interest has grown in investigating heat transport by means of tracer tests, driven by the important ... -
Heat and moisture insulation by means of air curtains: application to refrigerated chambers
(Elsevier, 2016-08)
Article
Open AccessThe present study is devoted to the determination of the efficiency of air curtain units (ACUs) applied to heat and moisture insulation of refrigerated chambers. A detailed study of the fluid dynamics and heat and mass ... -
Heat transfer analysis and numerical simulation of a parabolic trough solar collector
(2013-11-01)
Article
Open AccessParabolic trough solar collector is the most proven industry-scale solar generation technology today available. The thermal performance of such devices is of major interest for optimising the solar field output and increase ... -
Heat transfer at the nanoscale : The hyperbolic heat equation
(Universitat Politècnica de Catalunya, 2015-07)
Bachelor thesis
Open AccessThe 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 ... -
Heat transfer enhancement in air by means of acoustic fields
(Universitat Politècnica de Catalunya, 2022-07-07)
Master thesis
Open AccessConvection is the most important heat transfer mechanism in air, and every heat source cools down thanks to it. However, this phenomenon relies on buoyancy and this does not exist in microgravity conditions. For this reason, ... -
Modelització estocàstica en temps continu. Aplicació a les dinàmiques de calor d’un edifici
(Universitat Politècnica de Catalunya, 2020-01)
Bachelor thesis
Open AccessEn 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 ... -
Modelization of a molten salt thermal energy storage for concentrated solar power
(Scipedia, 2022)
Conference report
Open AccessA numerical model for studying a storage tank for concentrated solar power is presented. The model consists of solving the heat equation for the solid part made from ceramic materials, a one-dimensional model for the molten ... -
Numerical and experimental investigation of a vertical LiBr falling film absorber considering wave regimes and in presence of mist flow
(2016-11-01)
Article
Open AccessThe absorber represents the most critical component in absorption systems and one of the key issues. In this component complex heat and mass transfer phenomena during the absorption process takes place simultaneously. For ... -
Numerical study of heat transfer from a synthetic impinging jet with a detailed model of the actuator membrane
(2019-02-02)
Article
Open AccessSynthetic jets are produced by the oscillatory movement of a membrane inside a cavity, causing the fluid to enter and leave through a small orifice. The present study is focused on investigating the cooling capabilities ... -
Particulate immersed boundary method for complex fluid-particle interaction problems with heat transfer
(2016-01-01)
Article
Open AccessIn our recent work (Zhang et al., 2015), a Particulate Immersed Boundary Method (PIBM) for simulating fluid-particle multiphase flow was proposed and assessed in both two- and three-dimensional applications. In this study, ... -
Resolució numèrica de les equacions de conservació de la massa, quantitat de moviment i energia. Anàlisis de fluxos en geometries complexes
(Universitat Politècnica de Catalunya, 2021-10-21)
Bachelor thesis
Open AccessEl present estudi gira entorn de la implementació de codis en llenguatge C++ capa¸cos de resoldre problemes de dinàmica de fluids i transferència de calor i massa, així com el posterior anàlisi i impressió dels resultats ... -
Study and development of a solidification model using CFD
(Universitat Politècnica de Catalunya, 2022-07-15)
Master thesis
Open AccessAquesta tesis de màster estableix un estat de l'art sobre diferents models de congelació de l'aigua utilitzant tècniques numèriques per donar resposta a un problema industrial. Mecanismes de transferència de calor com la ... -
Study for the computational resolution of conservation equations of mass, momentum and energy. Possible application to different aeronautical and industrial engineering problems: Case 5E
(Universitat Politècnica de Catalunya, 2017-06-10)
Bachelor thesis
Restricted access - author's decisionAnàlisis previ d'antecedents i state-of-the-art. Plantejament del fenomen físic, formulació matemàtica i desenvolupament de les eines de simulació numèrica necessàries. Verificació dels codis i de les solucions numèriques. ... -
Validation of a BEPU methodology through a blind benchmark activity at the PKL test facility
(American Nuclear Society (ANS), 2019)
Conference report
Restricted access - publisher's policyValidation is a key step in the field of thermal hydraulics and has played a crucial role in the implementation of system codes. These codes are then included in licensing methodologies being those either best estimate ...
