Enviaments recents

  • A first estimate for a pressure-retarded osmosis-driven thermosyphon 

    Arias Montenegro, Francisco Javier (2017-12-01)
    Article
    Accés restringit per política de l'editorial
    Pressure retarded osmosis (PRO) process and its significance for thermosyphon technology is discussed. In previous work the possibility to drive a thermosyphon by difference of densities from induced salinity gradients ...
  • Failure investigation of a Pelton turbine runner 

    Egusquiza Montagut, Mònica; Egusquiza Estévez, Eduard; Valentín Ruiz, David; Valero Ferrando, Ma. del Carmen; Presas Batlló, Alexandre (Elsevier, 2017-11)
    Article
    Accés restringit per política de l'editorial
    In this paper, an uncommon failure of a Pelton turbine has been analyzed. After the monitoring system detected a sudden increase in the vibration levels, the turbine was inspected. The inspection showed that a fragment of ...
  • Pressure-drop coefficients for cushioning system of hydraulic cylinder with grooved piston: a computational fluid dynamic simulation 

    Castilla López, Roberto; Alemany, Ignasi; Algar, Antonio; Gámez Montero, Pedro Javier; Roquet, Pedro; Codina Macià, Esteban (2017-10-25)
    Article
    Accés obert
    Cushioning is an important aspect in hydraulic cylinder performance. The piston has to be decelerated before it strikes the end cap in order to avoid stresses in the cylinder components and reduce vibration that can be ...
  • Magnet-sleeve-sealed mini trochoidal-gear pump prototype with polymer composite gear 

    Gámez Montero, Pedro Javier; Antoniak, Piotr; Castilla López, Roberto; Freire Venegas, Francisco Javier; Krawczyk, Justyna; Stryczek, Jaroslaw; Codina Macià, Esteban (2017-09-21)
    Article
    Accés obert
    The trochoidal-gear technology has been growing in groundbreaking fields. Forthcoming applications are demanding to this technology a step forward in the conceiving stage of positive displacement machines. The compendium ...
  • A negative reactivity feedback driven by induced buoyancy after a temperature transient in lead-cooled fast reactors 

    Arias Montenegro, Francisco Javier (2017-10-24)
    Article
    Accés restringit per política de l'editorial
    Consideration is given to the possibility to use changes in buoyancy as a negative reactivity feedback mechanism during temperature transients in heavy liquid metal fast reactors (HLMFRs). It is shown that by the proper ...
  • Deliberate salinization of seawater for desalination of seawater 

    Arias Montenegro, Francisco Javier (2017-09-15)
    Article
    Accés restringit per política de l'editorial
    The basis of a novel method for seawater desalination is outlined. In this work, pressure-retarded osmosis (PRO) energy is obtained and used posteriorly for the reverse osmosis (RO) process for seawater desalination. ...
  • Computational fluid dynamics modeling of impinging gas-jet systems: II. Application to an industrial cooling system device 

    Coussirat Núñez, Miguel Gustavo; van Beeck, J; Mestres Ridge, Marc; Egusquiza Estévez, Eduard; Buchlin, J-M; Valero Ferrando, Ma. del Carmen (2005-07-15)
    Article
    Accés restringit per política de l'editorial
    A numerical analysis of the flow behavior in industrial cooling systems based on arrays of impinging jets has been performed, using several eddy viscosity models to determine their modeling capabilities. For the cooling ...
  • Computational fluid dynamics modeling of impinging gas-jet systems: I. Assessment of eddy viscosity models 

    Coussirat Núñez, Miguel Gustavo; van Beeck, J; Mestres Ridge, Marc; Egusquiza Estévez, Eduard; Buchlin, J-M; Escaler Puigoriol, Francesc Xavier (2005-07-15)
    Article
    Accés restringit per política de l'editorial
    Computational 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 3D movement in cushioning of hydraulic cylinder 

    Algar, Antonio; Codina Macià, Esteban; Freire Venegas, Francisco Javier (2017-05-25)
    Article
    Accés obert
    A double acting cylinder operation has been fully monitored in its key functional parameters, focused on characterization of end-of-stroke cushioning and starting phases. Being the cylinder performance reliant in the piston ...
  • Method for fluid flow simulation of a gerotor pump using OpenFOAM 

    Castilla López, Roberto; Gámez Montero, Pedro Javier; Raush Alviach, Gustavo Adolfo; Codina Macià, Esteban (2017-07-21)
    Article
    Accés restringit per política de l'editorial
    A new approach based on the open source tool OpenFOAM is presented for the numerical simulation of a mini gerotor pump working at low pressure. The work is principally focused on the estimation of leakage flow in the ...
  • On the use of a dedicated ballast pellet for a prompt self-ejection mechanism after a temperature transient in lead-cooled fast reactors 

    Arias Montenegro, Francisco Javier (2017-10)
    Article
    Accés restringit per política de l'editorial
    The potential use of changes in buoyancy as a reactivity feedback mechanism during temperature transients in heavy liquid metal fast reactors (HLMFRs) is discussed. It is shown that with the use of ballast pellets (~15% ...
  • Ocean thermal energy conversion by deliberate seawater salinization 

    Arias Montenegro, Francisco Javier (2017-07-27)
    Article
    Accés restringit per política de l'editorial
    Consideration is given to the possibility of ocean thermal energy conversion (OTEC) by the deliberate salinization of surface seawater. The proposed technique is similar to traditional OTEC, with one important exception: ...

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