Now showing items 1-20 of 56

    • 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
    • Controlled generation of vapor/liquid slug flows by local boiling in microgravity 

      Bitlloch, Pau; Ruiz Martí, Xavier; Ramírez de la Piscina Millán, Laureano; Casademunt Viader, Jaume (2020-09-01)
      Article
      Open Access
      We design, construct, and test a device for controlled boiling by means of local vapor bubble formation in a cavity that injects vapor bubbles in a capillary crossflow. The outcome of the device is a regular slug flow of ...
    • Diamagnetic interactions in superheated-superconducting granules under an external magnetic field 

      Peñaranda Ayllón, Angelina; Auguet Sangrá, Carlota E.; Ramírez de la Piscina Millán, Laureano; Girard, Tom A. (2002-11)
      Article
      Open Access
      The study of the phase transitions produced in ensembles of metastable superconducting granules by magnetic field variations is important both for fundamental physics and for applications in particle detectors. Theoretical ...
    • 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 ...