Fabiana Diotallevi

Publications (3)6.67 Total impact

• Source

  Available from: ArXiv

  Article: Capillary filling with randomly coated walls

  Fabiana Diotallevi, Andrea Puglisi, Antonio Lamura, Sauro Succi
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  ABSTRACT: The motion of an air-fluid interface through an irregularly coated capillary is studied by analysing the Lucas-Washburn equation with a random capillary force. The pinning probability goes from zero to a maximum value, as the interface slows down. Under a critical velocity, the distribution of waiting times $\tau$ displays a power-law tail $\sim \tau^{-2}$ which corresponds to a strongly intermittent dynamics, also observed in experiments. We elaborate a procedure to predict quantities of experimental interest, such as the average interface trajectory and the distribution of pinning lengths. Comment: 5 pages, 3 figures, 1 table, submitted
  07/2008;
• Source

  Available from: Fabio Cecconi

  Article: Inelastic hard rods in a periodic potential.

  Fabio Cecconi, Umberto Marini Bettolo Marconi, Fabiana Diotallevi, Andrea Puglisi
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  ABSTRACT: A simple model of inelastic hard rods subject to a one-dimensional array of identical wells is introduced. The energy loss due to inelastic collisions is balanced by the work supplied by an external stochastic heat bath. We explore the effect of the spatial nonuniformity on the steady states of the system. The spatial variations of the density, granular temperature, and pressure induced by the gradient of the external potential are investigated and compared with the analogous variations in an elastic system. Finally, we study the clustering process by considering the relaxation of the system starting from a uniform homogeneous state.
  The Journal of Chemical Physics 10/2004; 121(11):5125-32. · 3.33 Impact Factor
• Source

  Available from: Fabio Cecconi

  Article: Fluid-like behavior of a one-dimensional granular gas.

  Fabio Cecconi, Fabiana Diotallevi, Umberto Marini Bettolo Marconi, Andrea Puglisi
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  ABSTRACT: We study the properties of a one-dimensional (1D) granular gas consisting of N hard rods on a line of length L (with periodic boundary conditions). The particles collide inelastically and are fluidized by a heat bath at temperature Tb and viscosity gamma. The analysis is supported by molecular dynamics simulations. The average properties of the system are first discussed, focusing on the relations between granular temperature Tg=mv2, kinetic pressure, and density rho=N/L. Thereafter, we consider the fluctuations around the average behavior obtaining a slightly non-Gaussian behavior of the velocity distributions and a spatially correlated velocity field; the density field displays clustering: this is reflected in the structure factor which has a peak in the k approximately 0 region suggesting an analogy between inelastic hard core interactions and an effective attractive potential. Finally, we study the transport properties, showing the typical subdiffusive behavior of 1D stochastically driven systems, i.e., </x(t)-x(0)/2> approximately Dt(1/2), where D for the inelastic fluid is larger than the elastic case. This is directly related to the peak of the structure factor at small wave vectors.
  The Journal of Chemical Physics 02/2004; 120(1):35-42. · 3.33 Impact Factor