Ara es mostren els items 1-20 de 49

  • A study of a monodisperse microbubble jet under microgravity conditions 

    Carrera, Jordi; Ruiz, Xavier; Bitlloch, P.; Ramírez de la Piscina Millán, Laureano; Arias Calderón, Santiago; González Cinca, Ricardo; Dreyer, Michael; Casademunt, Jaume (2007)
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  • Bubble dynamics in turbulent duct flows: Lattice-Boltzmann simulations and drop tower experiments 

    Bitlloch, Pau; Ruiz Martí, Xavier; Ramírez de la Piscina Millán, Laureano; Casademunt Viader, Jaume (2018-06-23)
    Article
    Accés obert
    Lattice-Boltzmann simulations of a turbulent duct flow have been carried out to obtain trajectories of passive tracers in the conditions of a series of microgravity experiments of turbulent bubble suspensions. The statistics ...
  • Characterization of a microbubble injector for applications in microgravity 

    Arias Calderón, Santiago; Ruiz, Xavier; Ramírez de la Piscina Millán, Laureano; Casademunt, Jaume; González Cinca, Ricardo (Université Libre de Bruxelles, 2007-04)
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  • Characterization of the performance of a minibubble generator in conditions relevant to microgravity 

    Arias Calderón, Santiago; González Cinca, Ricardo; Ruiz, X; Ramírez de la Piscina Millán, Laureano; Casademunt, Jaume (2010-08-05)
    Article
    Accés obert
    We perform a characterization of a recently reported minibubbles (bubbles with a diameter of the order of 10‐3 m) generator in microgravity related conditions. Generation of bubbles is based on the generation of a slug ...
  • Characterization of the performance of an injector for the controlled generation of microbubbles 

    Arias Calderón, Santiago; González Cinca, Ricardo; Ruiz, Xavier; Ramírez de la Piscina Millán, Laureano; Casademunt, Jaume (IAC, 2008-10)
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    We perform a characterization of a recently reported microbubble injector in conditions relevant to microgravity. Injection of bubbles is based on the generation of a slug flow in a capillary T-junction, whose operation ...
  • Characterization of the performance of an injector for the generation of controlled microbubbles 

    Arias Calderón, Santiago; Ruiz, Xavier; Ramírez de la Piscina Millán, Laureano; Casademunt, Jaume; González Cinca, Ricardo (Universite Libre de Bruxelles, 2008-09)
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  • Codimension-2 Bifurcations in Binary-Mixture Convection 

    Meca Álvarez, Esteban; Mercader Calvo, María Isabel; Ramírez de la Piscina Millán, Laureano (2010)
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  • Dynamics and statistics of a microbubble jet in microgravity 

    Bitlloch, Pau; Carrera, Jordi; Ruiz, Xavier; González Cinca, Ricardo; Ramírez de la Piscina Millán, Laureano; Casademunt, Jaume (European Low Gravity Research Association (ELGRA), 2007-09)
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  • Effective diffusion in a stochastic velocity field 

    Careta i Pons, Agustí; Sagués Mestre, Francesc; Ramírez de la Piscina Millán, Laureano; Sancho, Jose Maria (Springer Verlag, 1993-04-01)
    Article
    Accés restringit per política de l'editorial
    Analytical results are derived for the effective dispersion of a passive scalar in a stochastic velocity field evolving in a fast time scale. These results are favorably compared with direct computer simulation of ...
  • Escape over a potential barrier driven by colored noise: large but finite correlation time 

    de la Rubia, Francisco Javier; Peacock-López, E.; Tsironis, G P; Lindenberg, Katja; Ramírez de la Piscina Millán, Laureano; Sancho, Jose Maria (1988)
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    Accés obert
    The recent theory of Tsironis and Grigolini for the mean first-passage time from one metastable state to another of a bistable potential for long correlation times of the noise is extended to large but finite correlation times.
  • Experimental characterization of a microbubble injector 

    Arias Calderón, Santiago; Ruiz, Xavier; Ramírez de la Piscina Millán, Laureano; Casademunt, Jaume; González Cinca, Ricardo (2007-07)
    Text en actes de congrés
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  • Experimental study of a microbubble injector for microgravity applications 

    Arias Calderón, Santiago; Ruiz, Xavier; Ramírez de la Piscina Millán, Laureano; Carrera, Jordi; Casademunt, Jaume; González Cinca, Ricardo (2007)
    Text en actes de congrés
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  • Experimental study of a microchannel bubble injector for microgravity applications 

    Arias Calderón, Santiago; Ruiz, Xavier; Casademunt, Jaume; Ramírez de la Piscina Millán, Laureano; González Cinca, Ricardo (Springer, 2008-07)
    Article
    Accés obert
    We perform a quantitative characterization of a microbubble injector in conditions relevant to microgravity. The injector pregenerates a slug flow by using a capillary T-junction, whose operation is robust to changes ...
  • External fluctuations in front propagation 

    Armero Rovira, J.; Sancho, Jose Maria; Casademunt, Jaume; Lacasta Palacio, Ana María; Ramírez de la Piscina Millán, Laureano; Sagués Mestre, Francesc (American Physical Society, 1996-04-01)
    Article
    Accés obert
    We study the effects of external noise in a one-dimensional model of front propagation. Noise is introduced through the fluctuations of a control parameter leading to a multiplicative stochastic partial differential equation. ...
  • First-passage time in a bistable potential with colored noise 

    Ramírez de la Piscina Millán, Laureano; Sancho, Jose Maria; de la Rubia, Francisco Javier; Lindenberg, Katja; Tsironis, G P (1989-08-15)
    Article
    Accés obert
    A precise digital simulation of a bistable system under the effect of colored noise is carried out. A set of data for the mean first-passage time is obtained. The results are interpreted and compared with presently available ...
  • First-passage times for a marginal state driven by colored noise 

    Ramírez de la Piscina Millán, Laureano; Sancho, Jose Maria (The American Physical Society, 1991-01-18)
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    Accés obert
    The dynamical process through a marginal state (saddle point) driven by colored noise is studied. For small correlation time of the noise, the mean first-passage time and its variance are calculated using standard methods. ...
  • Fixed-density boundary conditions in overdamped Langevin simulations of diffusion in channels 

    Ramírez de la Piscina Millán, Laureano (2018-07)
    Article
    Accés obert
    We consider the numerical integration of Langevin equations for particles in a channel, in the presence of boundary conditions fixing the concentration values at the ends. This kind of boundary condition appears for instance ...
  • Fluctuations in domain growth: Ginzburg-Landau equations with multiplicative noise 

    Ramírez de la Piscina Millán, Laureano; Sancho, Jose Maria; Hernández Machado, Aurora (The American Physical Society, 1993-07-01)
    Article
    Accés obert
    Ginzburg-Landau equations with multiplicative noise are considered, to study the effects of fluctuations in domain growth. The equations are derived from a coarse-grained methodology and expressions for the resulting ...
  • Front propagation in spatially modulated media 

    Armero, J.; Lacasta Palacio, Ana María; Ramírez de la Piscina Millán, Laureano; Casademunt, Jaume; Sancho, Jose Maria; Sagués Mestre, Francesc (American Physical Society, 1997-09-01)
    Article
    Accés obert
    A two-dimensional reaction-diffusion front which propagates in a modulated medium is studied. The modulation consists of a spatial variation of the local front velocity in the transverse direction to that of the ...
  • Generation and control of monodisperse bubble suspensions in microgravity 

    Bitlloch, Pau; Ruiz Martí, Xavier; Ramírez de la Piscina Millán, Laureano; Casademunt Viader, Jaume (2018-06-01)
    Article
    Accés obert
    A new experimental setup for the generation of homogeneous, monodisperse bubble suspensions in turbulent duct flows in microgravity has been designed and tested in drop tower experiments. The setup provides independent ...