We study front propagation and diffusion in the reaction-diffusion system A left arrow over right arrow A+A on a lattice. On each lattice site at most one A particle is allowed at any time. In this... Show moreWe study front propagation and diffusion in the reaction-diffusion system A left arrow over right arrow A+A on a lattice. On each lattice site at most one A particle is allowed at any time. In this paper, we analyze the problem in the full range of parameter space, keeping the discrete nature of the lattice and the particles intact. Our analysis of the stochastic dynamics of the foremost occupied lattice site yields simple expressions for the front speed and the front diffusion coefficient which are in excellent agreement with simulation results. Show less
Snoeijer, J.H.; Hecke, M.L. van; Somfai, E.; Saarloos, W. van 2003
The influence of the local contact network on interparticle forces and effective particle weights is studied in simulations of two-dimensional packings of frictionless, Hertzian spheres. The weight... Show moreThe influence of the local contact network on interparticle forces and effective particle weights is studied in simulations of two-dimensional packings of frictionless, Hertzian spheres. The weight distribution P(w) changes qualitatively when approaching a boundary and differs for regular and irregular packings, while the interparticle force distribution P(f) is robust. We provide examples where P(w) at the boundary, which is the quantity probed experimentally, deviates substantially from P(f) in the bulk. Discrepancies between the P(w)’s predicted by the q model and measured in experiments are due to differences in the contact geometry. Show less
Bertola, V.; Meulenbroek, B.; Wagner, C.; Storm, C.; Morozov, A.; Saarloos, W. van; Bonn, D. 2003
The production rate of polymer fibers by extrusion is usually limited by the appearance of a series of instabilities ("melt fracture") that lead to unwanted undulations of the surface. We present... Show moreThe production rate of polymer fibers by extrusion is usually limited by the appearance of a series of instabilities ("melt fracture") that lead to unwanted undulations of the surface. We present both qualitative and quantitative experimental evidence that-in addition to previously known polymer-specific scenarios-there is an intrinsic route towards melt fracture type phenomena: a nonlinear ("subcritical") instability of viscoelastic Poiseuille flow. Show less
Saarloos, W. van; Gastel, R. van; Frenken, J.W.M.; Schwartzentruber, B.S.; Somfai, E. 2003
