Now showing items 1-20 of 54

    • 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)
      Conference report
      Open Access
    • 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
      Open Access
      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)
      Conference report
      Open Access
    • 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
      Open Access
      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)
      Conference report
      Open Access
      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)
      Conference lecture
      Open Access
    • Codimension-2 Bifurcations in Binary-Mixture Convection 

      Meca Álvarez, Esteban; Mercader Calvo, María Isabel; Ramírez de la Piscina Millán, Laureano (2010)
      Conference report
      Restricted access - publisher's policy
    • 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)
      Conference report
      Open Access
    • 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
      Restricted access - publisher's policy
      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)
      Article
      Open Access
      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)
      Conference report
      Open Access
    • 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)
      Conference report
      Open Access
    • 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
      Open Access
      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 ...
    • Experimental study of a microchannel bubble injector for microgravity applications 

      Arias Calderón, Santiago; Ruiz, X; Casademunt Viader, Jaume; Ramírez de la Piscina Millán, Laureano; González Cinca, Ricardo (2009-01)
      Article
      Restricted access - publisher's policy
      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 in ...
    • 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
      Open Access
      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
      Open Access
      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)
      Article
      Open Access
      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
      Open Access
      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
      Open Access
      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
      Open Access
      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 ...