Browsing by Subject "Calor--Transmissió"
Now showing items 1-20 of 30
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A 3D symmetry-preserving simulation of a concentrated photovoltaic thermal (CPVT) solar collector
(Institute of Physics (IOP), 2024)
Conference report
Open AccessIn this work, a general collocated and unconditionally stable framework on unstructured meshes for solving Conjugate Heat Transfer (CHT) problems is presented by means of preserving the underlying symmetries of the continuous ... -
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 experimental investigation of the thermal flame structure during side-wall quenching of a laminar premixed flame
(Elsevier, 2024-07-01)
Article
Open AccessThe thermal flame structure (i.e., the temperature distribution in the preheat and reaction zones) is a core element that describes fundamental flame behavior and chemical reactions. This work utilizes a suite of laser ... -
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 ... -
DNS and RANS simulations of a coil heat exchanger immersed in a tank
(Begell House, 2023)
Conference lecture
Restricted access - publisher's policyThe operation of heat exchangers in a thermal system can be described by simple heat transfer equations. The heat exchange is normally defined by a global heat transfer coefficient, which takes into account internal and ... -
Effect of wall heat flux on flame temperature profiles during side-wall quenching using advanced diagnostics
(2023)
Conference lecture
Restricted access - publisher's policyFlame-wall interaction (FWI) is a topic of increasing importance within combustion science. The fundamentals of FWI govern fuel efficiency, durability, and pollutant emissions in propulsion and power generation. Significant ... -
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 ... -
Far-field radiative thermal rectification based on asymmetric emissivity
(American Chemical Society (ACS), 2023-09-29)
Article
Open AccessThis experimental study investigates thermal rectification via asymmetric far-field thermal radiation on a fused silica slab. An asymmetrical distribution of surface emissivity is created over the device by partially ... -
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 and experimental studies to evaluate the conservative factor of the convective heat transfer coefficient applied to the design of components in particle accelerators
(2023)
Conference lecture
Restricted access - publisher's policyThe fluid boundary condition applied to the design of components in particle accelerators is calculated as a global variable through experimental correlations coming from the literature. This variable, defined as the ...
