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  • EXPERIMENTAL INVESTIGATION OF INDUCED SUPERSONIC BOUNDARY LAYER TRANSITION

     Bottini, Henny
    Defense's date: 2014-03-28
    Universitat Politècnica de Catalunya
    Theses

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    El desarrollo de la turbulencia en el interior de un flujo inicialmente laminar, a pesar de ser uno de los fenómenos más comunes en la mecánica de fluidos, continúa siendo un campo abierto de investigación. Esto es debido a las muchas y diversas causas que condicionan la transición de flujo laminar a régimen turbulento, a menudo actuando de modo combinado, cuyo efecto cambia con la velocidad del flujo y las cuales son difíciles de aislar en situaciones reales. Este es el motivo por el cual los experimentos que estudian la transición de régimen laminar a turbulento han sido y continúan siendouna herramienta fundamental para el investigador.Esta tesis doctoral ha abordado el estudio del comienzo de la turbulencia en flujos supersónicos desde un punto de vista experimental. Dos series de experimentos fueron realizados, cada uno en un túnel de viento supersónico específico. Laprimera serie tuvo como objetivo el seguimiento del inicio de la turbulencia causado por un único elemento de rugosidad de forma hexaédrica. Este tipo de experimentos fue realizado en un túnel de viento supersónico capaz de operar en un ciertorango de números de Mach, cuya caracterización fue completada en paralelo a esta investigación. Los experimentos fueron realizados a dos números de Mach, 1.6 y 2.3, y dos niveles de rugosidad diferentes variando la temperatura de pared.El objetivo de la segunda serie de medidas consistió en investigar los efectos del impacto de una onda de choque oblicua en una capa límite transitoria, en un flujo a Mach 2. El estado transitorio de una capa límite es aquel durante el cual la capalímite pasa de enteramente laminar a enteramente turbulenta. Esta transformación puede ser tanto natural como inducida.Ambos escenarios han sido reproducidos en esta tesis. La transformación natural ha sido representada mediante la presencia de un elemento de rugosidad, mientras que la transformación inducida se corresponde con el desarrollo de la capa límite aguas abajo del punto de liberación de chispas eléctricas.Para medir la evolución de flujos estacionarios y no estacionarios de alta frecuencia se emplearon sensores superficiales tales como thin-films y transductores piezoeléctricos de presión. Para determinar experimentalmente la temperatura derecuperación (recovery temperature) se aplicaron distintas temperaturas de pared a la pieza contenedora de los thin-films.De las medidas estacionarias se extrajeron las diferentes distribuciones del flujo de calor por convección, las cuales, junto con la distribución de la temperatura de recuperación, permitieron el cálculo de la distribución espacial del número deStanton. Estos resultados permitieron llegar a una conclusión sobre el estado general de la capa límite investigada en la primera serie de experimentos.Las medidas no estacionarias proporcionaron espectros de fluctuación de temperatura y presión, y evoluciones longitudinales de residuos cuadráticos medios (MSR), así como espectros de evolución temporal en una posición dada.Estos datos permitieron caracterizar, en la primera serie de experimentos, la inestabilidad producida por la rugosidad en la capa límite supersónica en distintas posiciones aguas abajo. Ayudaron, por tanto, a determinar el estado de la capa límite y, con ello, concluir en la efectividad de la rugosidad para provocar la transición a régimen turbulento. En la segunda serie de experimentos se pudieron señalar los efectos no estacionarios de la onda de choque incidiendo aguas debajo delelemento de rugosidad, y los efectos no estacionarios de la onda incidente aguas abajo del punto de liberación de chispas eléctricas. De este modo, se han identificado las diferencias entre el efecto de una onda de choque en presencia de unelemento de rugosidad y en el caso de la configuración limpia, y se han comparado los efectos del uso de diferentes frecuencias de descargas eléctricas.

  • Flexible rod design for educational wind balance

     Raush Alviach, Gustavo Adolfo; Castilla Lopez, Roberto; Gamez Montero, Pedro Javier; Wojciechowski, Jakub; Codina Macià, Esteban
    Experimental techniques
    Date of publication: 2013-08-05
    Journal article

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    This article provides a technical description of a flexible hinge for wind tunnel rigs. For academic purposes, the device was integrated into several rod flexures to build a home-made external wind balance system. The cylindrical elastic element incorporates several notches, and the flexure linkage is able to transmit force in the main axial direction without hindering perpendicular movement. The flexural element described here is simple and easily manufactured, and can also be used with other types of wind balance. The flexure described in this article has similar functionality to those mentioned in the reference section, but has a more compact element. The project's effectiveness was demonstrated in a series of experimental comparisons of forces and moments measured on a wing using the N.A.C.A. Clark-Y airfoil profile.

  • A novel fabrication technique to minimize poly(dimethylsiloxane)-microchannels deformation under high-pressure operation

     Madadi, Hojjat; Mohammadi, Mahdi; Casals Terre, Jasmina; Castilla Lopez, Roberto
    Electrophoresis
    Date of publication: 2013-10-27
    Journal article

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    PDMS is one of the most common materials used for the flow delivery in the microfluidics chips, since it is clear, inert, nontoxic, and nonflammable. Its inexpensiveness, straightforward fabrication, and biological compatibility have made it a favorite material in the exploratory stages of the bio-microfluidic devices. If small footprint assays want to be performed while keeping the throughput, high pressure-rated channels should be used, but PDMS flexibility causes an important issue since it can generate a large variation of microchannel geometry. In this work, a novel fabrication technique based on the prevention of PDMS deformation is developed. A photo-sensible thiolene resin (Norland Optical Adhesive 63, NOA 63) is used to create a rigid coating layer over the stiff PDMS micropillar array, which significantly reduces the pressure-induced shape changes. This method uses the exact same soft lithography manufacturing equipment. The verification of the presented technique was investigated experimentally and numerically and the manufactured samples showed a deformation 70% lower than PDMS conventional samples.

  • High-throughput microcapillary pump with efficient integrated low aspect ratio micropillars

     Madadi, Hojjat; Casals Terre, Jasmina; Castilla Lopez, Roberto; Sureda Anfres, Miquel
    Microfluidics and nanofluidics
    Date of publication: 2013-12
    Journal article

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    Prediction and reduction of pressure drop and resistance flow in micropillar arrays are important for the design of microfluidic circuits used in different lab-on-a-chip and biomedical applications. In this work, a diamond microchannel-integrated micropillar pump (dMIMP) with a resistance flow 35.5 % lower than a circular-based micropillar pump (cMIMP) has been developed via the optimization of the fluid dynamic behavior of different pillar shapes in a low aspect ratio (H/D ranged from 0.06 to 0.2) integrated pillar microchannel. The effect of different geometrical parameters (such as pillar shape and its distribution) has been considered to minimize the microchannel resistance flow. Six-micrometer-depth polidimetilsiloxane (PDMS) channels have been fabricated using a modified soft lithography process, which prevents the PDMS deformation under high-pressure operation. Flow through the fabricated samples has been numerically solved and experimentally measured, with an agreement higher than 90 %. The results have been used to validate the derived analytical formulation to determine the flow resistance in this type of channels, a fast approach to obtain the resistance flow in the design stage of microdevices. The analysis of the results indicates that, although porosity can be a determinant parameter to predict the resistance flow of MIMP, other geometrical parameters such as side distance between pillars and pillar shape play a major role in this scenario. Finally, a high-throughput optimized diamond MIMP pump has been designed, tested and validated as a capillary pump, showing that it can provide a flow rate 73 % higher than a circular MIMP pump.

  • Small-scale characteristics and turbulent statistics of the flow in an external gear pump by time-resolved PIV

     Ertürk, Nihal; Vernet Peña, Anton; Pallarès Marzal, Josep; Castilla Lopez, Roberto; Raush Alviach, Gustavo Adolfo
    Flow measurement and instrumentation
    Date of publication: 2013-03
    Journal article

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    Recent technology advancements in Particle Image Velocimetry (PIV) technique offers a new possibility to study the complex turbulent flows over a wide range of scales. It can be used for the estimation of the turbulent kinetic energy dissipation rate including spatial derivatives of the velocity fluctuation components. In this study the flow characteristics of an external gear pump were studied with time-resolved Particle Image Velocimetry. Measurements were performed for two different spatial resolution configurations and various interrogation areas to estimate the dissipation rate of the turbulent kinetic energy. Results show that the spatial resolution is a critical factor in the accuracy of the measurements in the dissipation rate estimations. The optimal results can be achieved if the interrogation area is neither too large (sampling phenomenon) nor too small (noise in the measurement data). The effect of number of samples employed in the ensemble-averaging was considered as well.

  • Numerical analysis of external gear pumps including cavitation

     Del Campo Sud, David; Castilla Lopez, Roberto; Raush Alviach, Gustavo Adolfo; Gamez Montero, Pedro Javier; Codina Macià, Esteban
    Journal of fluids engineering. Transactions of ASME
    Date of publication: 2012-08
    Journal article

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  • Influence of the interteeth clearances on the flow ripple in a gerotor pump for engine lubrication

     Gamez Montero, Pedro Javier; Castilla Lopez, Roberto; Del Campo Sud, David; Ertürk, Nihal; Raush Alviach, Gustavo Adolfo; Codina Macià, Esteban
    Proceedings of the Institution of Mechanical Engineers. Part D, Journal of automobile engineering
    Date of publication: 2012-01-10
    Journal article

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  • Analysis of the Suction Chamber of External Gear Pumps and their Influence on Cavitation and Volumetric Efficiency  Open access

     Del Campo Sud, David
    Defense's date: 2012-04-27
    Department of Fluid Mechanics, Universitat Politècnica de Catalunya
    Theses

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    Hydraulic machines are faced with increasingly severe performance requirements. The need to design smaller and more powerful machines rotating at higher speeds in order to provide increasing efficiencies, has to face a major limitation: cavitation. A two-dimensional numerical approach, by means of Computational Fluid Dynamics (CFD), has been developed for studying the effect of cavitation in the volumetric efficiency of external gear pumps. Several cavitation models and grid deformation algorithms have been studied, and a method for simulating the contact between solid boundaries has been developed. The velocity field in the inlet chamber has also been experimentally measured by means of Time-Resolved Particle Image Velocimetry (TRPIV) and results have been compared to the numerical ones in order to validate the accuracy of the model. Our two-dimensional model is not able to predict the real volumetric efficiency of the pump, since several simplifications are involved in it. Nevertheless, this model shows to be valid to understand the complex flow patterns that take place inside the pump and to study the influence of cavitation on volumetric efficiency. The influence of the rotational speed of the pump has been analyzed, as well as the effect of the geometry of the inlet chamber, the working pressure, the inlet pressure loss factor, and the flow leakage through the radial clearances of the pump between gears and casing.

  • High Field Electrokinetic Effect: Theoretical Analysis and Capabilities for Space Propulsion

     Sureda Anfres, Miquel
    Defense's date: 2012-05-16
    Department of Fluid Mechanics, Universitat Politècnica de Catalunya
    Theses

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  • ROBUST, AND FLEXIBLE CAST IRON MANUFACTURING

     Khamashta Shahin, Munir; Gamez Montero, Pedro Javier; Castilla Lopez, Roberto; Raush Alviach, Gustavo Adolfo; Freire Venegas, Francisco Javier; Torres Lopez, Antonio Luis; Bonastre Marti, Jaime; Zoyo Garzon, Justo; Rio Cano, Carlos; Rajadell Carreras, Manuel; Codina Macià, Esteban
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  • Experimental analysis of the flow dynamics in the suction chamber of an external gear pump

     Ertürk, Nihal; Vernet Peña, Anton; Castilla Lopez, Roberto; Gamez Montero, Pedro Javier; Ferre, Josep Anton
    International journal of mechanical sciences
    Date of publication: 2011-02
    Journal article

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    Time-Resolved Particle Image Velocimetry (TRPIV) has been used to investigate the flow inside the suction chamber of an external gear pump where the movement of the fluid through the pump is maintained by the rotation of the gears. The main purpose of this paper is to study the characteristics of the complex flow pattern of this pump system in order to help in improving its total performance. The applied experimental techniques establish a method that allows visualising the flow inside the gear pump with a high rotational velocity system. Small micro air bubbles have been used as flow seeding. The images have been processed using domestic PIV software that uses specific aspects of the TRPIV technique. Instantaneous and phase-locked ensemble average fluid motions have been obtained for different gear pump rotational velocities to investigate the turbulence effect of rotating gears to the system.

    Time-Resolved Particle Image Velocimetry (TRPIV) has been used to investigate the flow inside the suction chamber of an external gear pump where the movement of the fluid through the pump is maintained by the rotation of the gears. The main purpose of this paper is to study the characteristics of the complex flow pattern of this pump system in order to help in improving its total performance. The applied experimental techniques establish a method that allows visualising the flow inside the gear pump with a high rotational velocity system. Small micro air bubbles have been used as flow seeding. The images have been processed using domestic PIV software that uses specific aspects of the TRPIV technique. Instantaneous and phase-locked ensemble average fluid motions have been obtained for different gear pump rotational velocities to investigate the turbulence effect of rotating gears to the system.

  • Turbulent structure in environmental flows: effects of stratification and rotation  Open access

     Matulka, Anna Magdalena
    Defense's date: 2010-03-19
    Department of Engineering Design, Universitat Politècnica de Catalunya
    Theses

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    Several series of experiments in stratified and in rotating/stratified decaying flows after a grid is used to stir the two layer stable fluid brine and fresh water set up. We measure by comparing the gained potential energy with the available kinetic energy AKE, the relative efficiency of mixing. The experiments in stratified rotating flows with grid driven turbulence were both periodic (quasi stationary) and non-monotonic (decaying) forcing. This thesis compares experimental, numerical and field observations on the structure and Topology of the Stratified Rotating Flows as well as their decay, the horizontal spectra changes appreciable with slopes from 1.1 to 5, but vorticity and local circulation, and also the initial topology and forcing of the flow. A detailed study of the vorticity decay and vortex and energy structure has been performed, the new results show that neither stratified nor rotating flows exhibit pure 2D structures. The work parameterizes the role of the Richardson number and the Rossby number, both in the experiments and in the ocean visualizations is very important. The conditions of vortex decay show the effects of the internal waves in the decay turbulent conditions both for stratified and rotating flows. The parameter space (Re,Ri,Ro) has been used to interpret many previously disconnected explanations of the 2D-3D turbulent behaviour. The comparison of numerical simulations with experiments has allowed implementing new theoretical aspects of the interaction between waves and vortices finding the surprising and very interesting result that these interactions depend on the level of enstrophy. This also leads to new ways of using multifractal analysis ad intermittency in ocean environmental observations. A large collection of SAR images obtained from three European coastal areas were used for routine satellite analysis by SAR and other sensors, which seem very important to build seasonal databases of the dynamic conditions of ocean mixing. The topology of the basic flow is very important and in particular the topology of the vortices and their decay which depends on ambient factors such as wave activity, wind and currents. We find more realistic estimates of the spatial/temporal non-homogeneities (and intermittency obtained as spatial correlations of the turbulent dissipation); these values are used to parameterize the sea surface turbulence, as well as a laboratory experiments at a variety of scales. Using multi-fractal geometry as well, we can establish now a theoretical pattern for the turbulence behaviour that is reflected in the different descriptors. Vorticity evolution is smoother and different than that of scalar or tracer density. The correlation between the local Ri and the fractal dimension detected from energy or entropy is good. Using multi-fractal geometry we can also establish certain regions of higher local activity used to establish the geometry of the turbulence mixing that needs to be studied in detail when interpreting the complex balance between the direct 3D Kolmogorov type cascade and the Inverse 2D Kraichnan type cascade.

  • Diffusion and scaling in the ocean surface

     Diez, Margarita; Bezerra, Maria Ozilea; Vila, Teresa; Castilla Lopez, Roberto; Redondo Apraiz, Jose Manuel
    Topical Problems of Fluid Mechanics
    Presentation's date: 2010-02-10
    Presentation of work at congresses

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  • Numerical analysis of the shaft motion in the journal bearing of a gear pump

     Castilla Lopez, Roberto; Gutes Serra, Mario; Gamez Montero, Pedro Javier; Codina Macià, Esteban
    Journal of engineering for gas turbines and power. Transactions of the ASME
    Date of publication: 2010-01
    Journal article

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    This paper describes a numerical analysis of the dynamics of the shaft in the journal bearing of a gear pump.

  • Numerical simulation of turbulent flow in the suction chamber of a gearpump using deforming mesh and mesh replacement

     Castilla Lopez, Roberto; Gamez Montero, Pedro Javier; Ertürk, Nihal; Vernet Peña, Anton; Coussirat Nuñez, Miguel Gustavo; Codina Macià, Esteban
    International journal of mechanical sciences
    Date of publication: 2010-10
    Journal article

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    The flow in the suction chamber of an external gearpump is numerically analysed. The evolution of the boundaries of the domain is very complex, and an arbitrary Lagrangian¿Eulerian (ALE) formulation is used with mesh deformation and local remeshing. Nevertheless, a mesh replacement strategy is also adopted in order to avoid skewed meshes and allow for simulation of solid contact between gears. This process approximates a more realistic flow behaviour when the working pressure is larger than 10 bar, which is an important in fluid power systems where the pressure is usually greater than 100 bar. Aside from the laminar model, which fails as a result of the vortex configuration in the suction chamber, Standard k¿e, RNG k¿e, Realizable k¿e and Reynolds Stress Models (RSM) are tested. The numerical flow is compared with experimental data obtained with Time Resolved Particle Image Velocimetry. Although all of the models failed in some respect, the RSM and RNG k¿e were the best choice provided its behaviour close to the gearing zone and general shape of the vortex distribution.

  • Misalignment effects on the load capacity of a hydraulic cylinder.

     Gamez Montero, Pedro Javier; Salazar, Edgar; Castilla Lopez, Roberto; Freire Venegas, Francisco Javier; Khamashta Shahin, Munir; Codina Macià, Esteban
    International journal of mechanical sciences
    Date of publication: 2009-02
    Journal article

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  • Friction effects on the load capacity of a column and a hydraulic cylinder

     Gamez Montero, Pedro Javier; Salazar, Edgar; Castilla Lopez, Roberto; Freire Venegas, Francisco Javier; Khamashta Shahin, Munir; Codina Macià, Esteban
    International journal of mechanical sciences
    Date of publication: 2009-02
    Journal article

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  • A CFD approach to evaluate the influence of construction and operation parameters on the performance of active transparent façades in Mediterranean climates

     Guardo Zabaleta, Alfredo de Jesús; Coussirat Nuñez, Miguel Gustavo; Egusquiza Estevez, Eduardo; Alavedra Ribot, Pere; Castilla Lopez, Roberto
    Energy and buildings
    Date of publication: 2009-12
    Journal article

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  • GEROLAB Package System: Innovative Tool to Design a Trochoidal-Gear Pump

     Gamez Montero, Pedro Javier; Castilla Lopez, Roberto; Mujal Rosas, Ramon Maria; Khamashta Shahin, Munir; Codina Macià, Esteban
    Journal of mechanical design
    Date of publication: 2009-07
    Journal article

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  • Experimental Study of the shaft motion in the journal bearing of a gear pump

     Castilla Lopez, Roberto; Gutes, M; Gamez Montero, Pedro Javier; Codina Macià, Esteban
    Journal of engineering for gas turbines and power. Transactions of the ASME
    Date of publication: 2009-05-26
    Journal article

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  • Heating of saturated porous media in practice: several causes of local thermal non-equilibrium

     Virto Albert, Saturnino Luis; Carbonell Ventura, Montserrat; Castilla Lopez, Roberto; Gamez Montero, Pedro Javier
    International journal of heat and mass transfer
    Date of publication: 2009-11
    Journal article

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    In recent years the industrial applications of porous materials has shown a growing relevance. Most of the technological thermal processes in porous media involve time-dependent thermal conditions. Therefore, the temperature at each point of the material also changes in time. In order to correctly carry out the technological process, it becomes necessary to know the temperature distribution inside the material. This is a problem of heat conduction in a fluid saturated porous media subject to a lack of local thermal equilibrium (LTNE). The purpose of this paper is to elucidate the several causes of LTNE, even in steady or quasi steady heat transfer processes in saturated porous media, and to evaluate the influence of structural characteristic of porous media and the presence of surfactant in the saturating liquid phase.

  • Experimental analysis of the three-phase induction motor with spiral sheet rotor

     Mujal Rosas, Ramon Maria; Boix Aragonès, Oriol; Gamez Montero, Pedro Javier; Castilla Lopez, Roberto; Lloberas Valls, Joaquim
    Electrical engineering
    Date of publication: 2009-12
    Journal article

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  • Workshop in Environmental and Geo-Astrophysical Turbulence

     Rodriguez Cantalapiedra, Inmaculada; Sanchez Ariz, Miguel A.; Ben Mahjoub Akalay, Otman; Carrillo Cortes, Jose Alejandro; Castilla Lopez, Roberto; Sekula, Emil; Redondo Apraiz, Jose Manuel
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  • Explotation plan template.

     Castilla Lopez, Roberto; Khamashta Shahin, Munir; Codina Macià, Esteban
    Date: 2009-02
    Report

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  • Determinación experimental de la curva característica de un ventilador axial: Modelo ISJ9225HA2SAL9802A

     Bonastre Marti, Jaime; Zoyo Garzon, Justo; Khamashta Shahin, Munir; Castilla Lopez, Roberto
    Date: 2009-03
    Report

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  • Determinación experimental de la curva característica de un ventilador axial: Modelo 1SJ1238HA2SPT9803H

     Bonastre Marti, Jaime; Zoyo Garzon, Justo; Khamashta Shahin, Munir; Castilla Lopez, Roberto
    Date: 2009-03
    Report

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  • Risk analysis-Overview of probabilistic approach.

     Castilla Lopez, Roberto; Gutierrez Pascual, Javier; Codina Macià, Esteban
    Date: 2009-03
    Report

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  • Dissemination activities (4th report).

     Castilla Lopez, Roberto; Rio Cano, Carlos; Torres Lopez, Antonio Luis
    Date: 2009-02
    Report

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  • Experimental measurements and diffusion in harbor and coastal zones

     Diez Rilova, Margarita; Bezerra Menezes, Maria Ozilea; Mösso Aranda, Octavio Cesar; Castilla Lopez, Roberto; Redondo Apraiz, Jose Manuel
    Nuovo cimento della Società Italiana di Fisica C. Geophysics and space physics
    Date of publication: 2009-07-17
    Journal article

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    Experimental results of turbulent flows in the sea surface near the coastline have been performed using both Lagrangian and Eulerian methods, field tests are presented using video recordings and velocity sensors. The spatial and temporal resolution is limited by the measuring instruments, which results in “filtering” out the very small scales. The experimental field-results obtained during the large-scale surf zone experiments carried out in the Ebro Delta, (Spain), under spilling/plunging breaking waves are compared with experiments performed at the Barcelona harbour. The field-measurements include several tests across the surf zone with high vertical resolution. The measured turbulent properties are compared with macroturbulence characteristics and length parameterisations. Diffusion is measured and related to the local velocity spectra so that a generalized Richardson law may be used.

  • Analysis of the turbulence in the suction chamber of an external gear pump using Time Resolved Particle Image Velocimetry

     Castilla Lopez, Roberto; Wojciechowski, J; Gamez Montero, Pedro Javier; Vernet, A; Codina Macià, Esteban
    Flow measurement and instrumentation
    Date of publication: 2008-12
    Journal article

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  • Flow simulation for cushioning of a cylinder

     Castilla Lopez, Roberto; Gamez Montero, Pedro Javier; Rio Cano, Carlos
    Date: 2008-04
    Report

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  • Periodic Activity Report (full project period)-WP6

     Gutierrez Pascual, Javier; Castilla Lopez, Roberto; Rio Cano, Carlos
    Date: 2008-09
    Report

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  • Description of the Aerosol Spectrometer used: Grimm

     Gibert Vives, Jose Maria; Castilla Lopez, Roberto; Rio Cano, Carlos
    Date: 2008-10
    Report

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  • Varilla flexible para balanza aerodinámica de plataforma

     Gamez Montero, Pedro Javier; Castilla Lopez, Roberto
    Date of request: 2008-10-30
    Invention patent

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  • Access to the full text
    Particle dispersion in two-dimensional turbulence: a comparison with 2-D kinematic simulation  Open access

     Castilla Lopez, Roberto; Redondo Apraiz, Jose Manuel; Gamez Montero, Pedro Javier; Babiano, Armando
    Nonlinear processes in geophysics
    Date of publication: 2007-03
    Journal article

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    We study numerically the comparison between Lagrangian experiments on turbulent particle dispersion in 2-D turbulent flows performed, on the one hand, on the basis of direct numerical simulations (DNS) and, on the other hand, using kinematic simulations (KS). Eulerian space-time structure of both DNS and KS dynamics are not comparable, mostly due to the absence of strong coherent vortices and advection processes in the KS fields. The comparison allows to refine past studies about the contribution of nonhomogeneous space-time 2-D Eulerian structure on the turbulent absolute and relative particle dispersion processes. We particularly focus our discussion on the Richardson’s regime for relative dispersion.

  • Turbulence in internal flows in mini-hydraulic components

     Castilla Lopez, Roberto; Gamez Montero, Pedro Javier; Huguet Ballester, David; Codina Macià, Esteban
    Date of publication: 2007-01
    Book chapter

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  • Turbulent flow in the suction chamber of a external gear pump

     Gamez Montero, Pedro Javier; Castilla Lopez, Roberto; Codina Macià, Esteban; Wojciechowski, J
    Congresso de Métodos Numéricos em Engenharia
    Presentation of work at congresses

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  • Infrared Spectrometry Method for oil mist determination. Preliminary Tests

     Gibert Vives, Jose Maria; Castilla Lopez, Roberto; Rio Cano, Carlos
    Date: 2007-09
    Report

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  • Varilla Flexible para Balanza Aerodinámica de Plataforma. Número de solicitud internacional: PCT/ES2008/000270

     Castilla Lopez, Roberto; Gamez Montero, Pedro Javier; Wojciechowski, J
    Date of request: 2007-04-19
    Invention patent

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    Varilla flexible para balanza aerodinámica de plataforma.

    La presente invención se refiere a una varilla flexible para la transmisión de la fuerza axial, especialmente la de compresión, eliminando las componentes normales, entre la plataforma de una balanza aerodinámica y las células de carga. Estas varillas representan una notable mejora respecto a otros diseños usados hasta ahora, dado que, por un lado, es fabricada en una única pieza, manteniendo de esta forma el eje sin perturbar y facilitando su manipulación, y, por otro lado, por su construcción, los elementos flexibles están protegidos frente a sobrecargas.

  • Contact problems of a trochoidal-gear pump

     Gamez Montero, Pedro Javier; Castilla Lopez, Roberto; Khamashta Shahin, Munir; Codina Macià, Esteban
    International journal of mechanical sciences
    Date of publication: 2006-12
    Journal article

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  • Estudio de la cámara de aspiración de bombas de engranajes mediante metología CFD y de visualización PIV

     Castilla Lopez, Roberto; Codina Macià, Esteban; Gamez Montero, Pedro Javier
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  • El problema del contacto en bombas de engranajes de perfil trocoidal

     Gamez Montero, Pedro Javier; Zarate Araiza, Jose Francisco; Sanchez, M; Castilla Lopez, Roberto; Codina Macià, Esteban
    Revista internacional de métodos numéricos para cálculo y diseño en ingeniería
    Date of publication: 2005-09
    Journal article

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  • El problema de contacto de bombas de engranajes de perfil trocoidal

     Gamez Montero, Pedro Javier; Zárate, F; Sanchez Romero, Montserrat; Castilla Lopez, Roberto; Codina Macià, Esteban
    Revista internacional de métodos numéricos para cálculo y diseño en ingeniería
    Date of publication: 2005-06
    Journal article

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  • Grup de Turbulencia, Fluctuacions i Difusió (Ayuda para grupos de investigación consolidados)

     Ramirez de La Piscina Millan, Laureano; Platonov, Alexei; Carrillo Cortes, Jose Alejandro; Sekula, Emil; Peñaranda Ayllon, Angelina; Echebarria Dominguez, Blas; Auguet Sangra, Carlota Eugenia; Meca Alvarez, Esteban; Cami Babra, Enrique; Castilla Lopez, Roberto; Rodriguez Cantalapiedra, Inmaculada; Grau Barcelo, Joan; Lacasta Palacio, Ana Maria; Redondo Apraiz, Jose Manuel; Sanchez Ariz, Miguel A.; Benitez Iglesias, Raul; Gonzalez Cinca, Ricardo
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  • State of the art about system safety and risk management

     Codina Macià, Esteban; Khamashta Shahin, Munir; Castilla Lopez, Roberto; Huguet Ballester, David
    Date: 2005-05
    Report

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  • CFD analysis of hydraulic cylinder cushioning

     Codina Macià, Esteban; Khamashta Shahin, Munir; Castilla Lopez, Roberto; Huguet Ballester, David
    Date: 2005-05
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  • CFD analysis of cylinder end stroke damping

     Codina Macià, Esteban; Khamashta Shahin, Munir; Castilla Lopez, Roberto; Huguet Ballester, David
    Date: 2005-05
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  • Buckling test bench design

     Codina Macià, Esteban; Khamashta Shahin, Munir; Castilla Lopez, Roberto; Huguet Ballester, David
    Date: 2005-12
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