Now showing items 3-17 of 17

  • Clogging transition of many particle systems flowing through bottlenecks 

    Zuriguel, Iker; Parisi, Daniel; Cruz Hidalgo, Raul; Lozano, Celia; Janda, Alvaro; Gago, Paula; Peralta, Juan; Ferrer, Luis; Pugnaloni, Luis; Clement, Eric; Maza, Diego; Pagonabarraga, Ignacio; Garcimartín, Angel (Scientific Reports, 2014)
    When a large set of discrete bodies passes through a bottleneck, the flow may become intermittent due to the development of clogs that obstruct the constriction. Clogging is observed, for instance, in colloidal suspensions, ...
  • Clogging transition of vibration driven vehicles passing through constrictions 

    Patterson, G.; Fierens, P.; Sangiuliano Jimka, F.; König, P.; Garcimartín, A.; Zuriguel, Iker; Pugnaloni, Luis; Parisi, D. (American Physical Society, 2017)
    We report experimental results on the competitive passage of elongated self-propelled vehicles rushing through a constriction. For the chosen experimental conditions, we observe the emergence of intermittencies similar to ...
  • Contact network topology in tapped granular media 

    Arévalo, Roberto; Pugnaloni, Luis; Zuriguel, Iker; Maza, Diego (American Physical Society, 2013)
    We analyze the contact network of simulated two-dimensional granular packings in different states of mechanical equilibrium obtained by tapping. We show that topological descriptors of the contact network allow one to ...
  • Dynamic transition in conveyor belt driven granular flow 

    Cordero, Jose; Pugnaloni, Luis (Elsevier, 2015)
    We consider the flow of disks of diameter d driven by a conveyor belt of dynamic friction coefficient μ through an aperture on a flat barrier. The flow rate presents two distinct regimes. At low belt velocities v the flow ...
  • Effect of particle shape and fragmentation on the response of particle dampers 

    Sánchez, Martín; Carlevaro, Manuel; Pugnaloni, Luis (SAGE Publications, 2014)
    A particle damper (PD) is a device that can attenuate mechanical vibrations thanks to the dissipative collisions between grains contained in a cavity attached to the vibrating structure. It has been recently suggested that, ...
  • Ergodic nonergodic transition in tapped granular systems; The role of persistent contacts 

    Gago, Paula; Maza, Diego; Pugnaloni, Luis (Papers in Physics, 2016)
    Static granular packs have been studied in the last three decades in the frame of a modi ed equilibrium statistical mechanics that assumes ergodicity as a basic postulate. The canonical example on which this framework is ...
  • Experimental proof of faster is slower in systems of frictional particles flowing through constrictions 

    Pastor, Jose; Garcimartín, Angel; Gago, Paula; Peralta, Juan; Martín Gomez, Cesar; Ferrer, Luis; Maza, Diego; Parisi, Daniel; Pugnaloni, Luis; Zuriguel, Iker (American Physical Society, 2015)
    The “faster-is-slower” (FIS) effect was first predicted by computer simulations of the egress of pedestrians through a narrow exit [D. Helbing, I. J. Farkas, and T. Vicsek, Nature (London) 407, 487 (2000)]. FIS refers to ...
  • First order phase transition during displacement of amphiphilic biomacromolecules from interfaces by surfactant molecules 

    Ettelaie, Rammile; Dickinson, Eric; Pugnaloni, Luis (Journal of Physics: Condensed Matter, 2014)
    The adsorption of surfactants onto a hydrophobic interface, already laden with a fixed number of polymers, is studied using the self consistent field (SCF) calculation method of Scheutjens and Fleer. For polymers having ...
  • Flow rate of polygonal grains through a bottleneck Interplay between shape and size 

    Goldberg, Ezequiel; Carlevaro, Manuel; Pugnaloni, Luis (Papers in Physics, 2015)
    We report two-dimensional simulations of circular and polygonal grains passing through an aperture at the bottom of a silo. The mass flow rate for regular polygons is lower than for disks\red{,} as observed by other authors. ...
  • On and off dynamics of a creeping frictional system 

    Blanc, Baptiste; Geminard, Jean Christophe; Pugnaloni, Luis (Springer, 2014)
    We report on the dynamics of a model frictional system submitted to minute external perturbations. The system consists of a chain of sliders connected through elastic springs that rest on an incline. By introducing cyclic ...
  • Relevance of system size to the steady state properties of tapped granular systems 

    Gago, Paula; Maza, Diego; Pugnaloni, Luis (American Physical Society, 2015)
    We investigate the steady-state packing fraction ϕ and force moment tensor Σ of quasi-two-dimensional granular columns subjected to tapping. Systems of different height h and width L are considered. We find that ϕ and Σ, ...
  • Structure of force networks in tapped particulate systems of disks and pentagons I Clusters and loops 

    Pugnaloni, Luis; Carlevaro, Manuel; Kramar, M; Mischaikow, K; Kondic, L (American Physical Society, 2016)
    The force network of a granular assembly, defined by the contact network and the corresponding contact forces, carries valuable information about the state of the packing. Simple analysis of these networks based on the ...
  • Structure of force networks in tapped particulate systems of disks and pentagons II Persistence analysis 

    Kondic, L.; Kramar, M.; Pugnaloni, Luis; Carlevaro, Manuel; Mischaikow, K. (American Physical Society, 2016)
    In the companion paper [Pugnaloni et al., Phys. Rev. E 93, 062902 (2016)], we use classical measures based on force probability density functions (PDFs), as well as Betti numbers (quantifying the number of components, ...
  • Tapped granular packings described as complex networks 

    Arévalo, Roberto; Pugnaloni, Luis; Maza, Diego; Zuriguel, Iker (Taylor and Francis, 2013)
    We characterize the structure of simulated two-dimensional granular packings using con- cepts from complex networks theory. The packings are generated by a simulated tapping protocol, which allows us to obtain states in ...
  • Wang Landau algorithm for entropic sampling of arch based microstates in the volume ensemble of static granular packings 

    Slobinsky, Demian; Pugnaloni, Luis (Papers in Physics, 2015)
    We implement the Wang-Landau algorithm to sample with equal probabilities the static configurations of a model granular system. The "non-interacting rigid arch model" used is based on the description of static configurations ...