Ara es mostren els items 18-37 de 151

    • A simple optimization approach for the insulation thickness distribution in household refrigerators 

      Trias Miquel, Francesc Xavier; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David (Elsevier, 2018-09)
      Article
      Accés obert
      Determination of the optimal insulation thickness is of great relevance in many thermal engineering applications. In this paper, a simple optimization strategy based on the Lagrange multipliers is presented. The optimal ...
    • Advanced analysis of thermal energy storage in CSP plants 

      Pérez Segarra, Carlos David; González Acedo, Ignacio; Torras Ortiz, Santiago; Rigola Serrano, Joaquim; Oliva Llena, Asensio (2016-11-24)
      Report de recerca
      Accés obert
    • An efficient strategy of parcel modeling for polydispersed multiphase turbulent flows 

      Bahramian, Linda; Muela Castro, Jordi; Oliet Casasayas, Carles; Pérez Segarra, Carlos David; Trias Miquel, Francesc Xavier (Scipedia, 2022)
      Text en actes de congrés
      Accés obert
      A three-dimensional particle-laden two-phase turbulent flow by employing the Eulerian-Lagrangian method using multiphase Particle-In-Cell model is implemented to analyze the effects of parcel modeling. In order to achieve ...
    • An energy-preserving unconditionally stable fractional step method on collocated grids 

      Santos Serrano, Daniel; Trias Miquel, Francesc Xavier; Colomer Rey, Guillem; Pérez Segarra, Carlos David (Scipedia, 2022)
      Text en actes de congrés
      Accés obert
      Preservation of energy is fundamental in order to avoid the introduction of unphysical energy that can lead to unstable simulations. In this work, an energy-preserving unconditionally stable fractional step method on ...
    • An enhanced finite volume based solver for thermoelastic materials in fluid-structure coupled problems 

      González Acedo, Ignacio; Naseri, Alireza; Chiva Segura, Jorge; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David (2018)
      Text en actes de congrés
      Accés restringit per política de l'editorial
    • An immersed boundary method to conjugate heat transfer problems in complex geometries. Application to an automotive antenna 

      Favre, F.; Antepara Zambrano, Óscar; Oliet Casasayas, Carles; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David (2019-02-05)
      Article
      Accés obert
      Considering that the most common reason for electronic component failure is the excessive temperature level, an efficient thermal management design can prolong the operating life of the equipment, while also increasing its ...
    • Analysis of fin-and-tube evaporators in no-frost domestic refrigerators 

      Oliet Casasayas, Carles; Pérez Segarra, Carlos David; Rigola Serrano, Joaquim; Oliva Llena, Asensio (2010)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      This paper summarizes the research work carried out by the authors on domestic refrigerator no-frost evaporators. It includes an explanation of the experimental unit that is currently being constructed to test isobutane ...
    • Analysis of the dynamic behavior of refrigerated spaces using air curtains 

      Jaramillo Ibarra, Julian Ernesto; Pérez Segarra, Carlos David; Oliva Llena, Asensio; Oliet Casasayas, Carles (2009-01-01)
      Article
      Accés restringit per política de l'editorial
      This article is devoted to the study of air curtains applied to reduce the refrigerated chambers heat gains. The proposed strategy is based on the numerical simulation of air curtains by means of computational fluid dynamics ...
    • Analysis of vapour-compression refrigerating systems 

      Sadurní Caballol, Alexandre; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David (2011)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      The aim of this paper is to show the authors proposal for steady state numerical simulation of Vapour-Compression Refrigerating Systems (dry expansion, liquid overfeed systems, ...). The developed tool allows using different ...
    • Assessment of numerical aspects using LES in particle separation devices 

      Muela Castro, Jordi; Rigola Serrano, Joaquim; Oliet Casasayas, Carles; Pérez Segarra, Carlos David; Oliva Llena, Asensio (European Conference for AeroSpace Sciences (EUCASS), 2019)
      Text en actes de congrés
      Accés obert
      Numerical simulations can be a powerful tool for the design and optimization of Foreign Object Debris (FOD) protection and separation devices. This work aims to study the relevance and influence of different modelling and ...
    • Assessment of the symmetry-preserving regularization model on complex flows using unstructured grids 

      Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Rodríguez Pérez, Ivette María; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2012-05-15)
      Article
      Accés restringit per política de l'editorial
      The main objective of the present paper is the assessment of symmetry-preserving regularization models on unstructured meshes. Three different test cases have been studied: the impinging jet flow, the flow past a circular ...
    • Combustion and air flows simulations of an industrial kiln for sanitary ware manufacture 

      Liu, Jiannan; Ruano Pérez, Jesús; Schillaci, Eugenio; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David (Begell House, 2023)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      The implementation of green hydrogen as fuel in industrial kilns, such as those required in ceramic ware manufacturing processes, would be a disruptive milestone in the decarbonization process of the energyintensive industry. ...
    • Comparative study of subfilter scalar dissipation rate and mixture fraction variance models 

      Ventosa Molina, Jordi; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Muela Castro, Jordi; Oliva Llena, Asensio (2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Accurate characterisation of mixing at the subfilter level is a critical aspect in many LES combustion models, such as flamelet based and Conditional Moment Closure models. Several models can be found in the literature, ...
    • Contrastación de diferentes criterios numéricos para la resolución de flujos potenciales mediante el empleo de coordenadas curvilíneas. Parte I: Función de corriente 

      Oliva, A.; Pérez Segarra, Carlos David; Costa, M. (Centro Internacional de Métodos Numéricos en Ingeniería, 1990)
      Article
      Accés obert
      En este trabajo se analizan y contrastan diferentes criterios numéricos para la resolución de flujos potenciales subsónicos compresibles mediante el empleo de la función de corriente. Los dominios son discretizados en base ...
    • Cost-vs-accuracy analysis of self-adaptive time-integration methods 

      Plana Riu, Josep; Trias Miquel, Francesc Xavier; Pérez Segarra, Carlos David; Oliva Llena, Asensio (Begell House, 2023)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The integration in time of the semi-discrete Navier-Stokes equations has been historically bounded by the classic CFL condition, and later on, an innovative method has been defined by ensuring the eigenvalues of the method ...
    • Criterios numéricos en la resolución de la transferencia de calor en fenómenos de convección 

      Pérez Segarra, Carlos David (Universitat Politècnica de Catalunya, 1988-02-18)
      Tesi
      Accés obert
      La finalidad de esta tesis es la obtención de las distribuciones de velocidades, presiones y temperaturas en la convección forzada de flujos compresibles en situaciones bidimensionales y de estabilización. Es a partir de ...
    • Detailed analysis of fin-and-tube evaporators 

      Oliet Casasayas, Carles; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2009-09-17)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      This paper is devoted to the presentation of a new model for fin-and-tube evaporators, focusing on the solid core simulation and its integration with a quasi-homogeneous two-phase flow model for the in-tube refrigerant ...
    • Detailed numerical model for the resolution of molten salt storage tanks for CSP plants 

      Pérez Segarra, Carlos David; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio; Torras Ortíz, Santiago; Lehmkuhl Barba, Oriol (2012)
      Text en actes de congrés
      Accés obert
      Considering the state-of-the-art in TES technologies, two-tank indirect system using molten salt is the most widespread within CSP plants. However, current techniques for design and optimization, as well as, for assessing ...
    • Detailed numerical study of turbulent flows in air curtains 

      Jaramillo Ibarra, Julian Ernesto; Pérez Segarra, Carlos David; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio (2010)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      Air curtains are generally a set of vertical or horizontal plane jets used as ambient separator. In order to prevent entrainment, a good air curtain should provide a jet with low turbulence level, enough momentum to ...
    • Detailed prediction of fluid-solid coupled phenomena of turbulent flow through reed valves 

      González Acedo, Ignacio; Naseri, Alireza; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David; Oliva Llena, Asensio (Institute of Physics (IOP), 2019)
      Text en actes de congrés
      Accés obert
      The operation of self-actuated valves in suction and discharge processes plays a crucial role in the thermal efficiency and structural reliability of hermetic reciprocating compressors. The present work provides a thorough ...