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6 papers · 1 filter
Mode-coupling approach to non-Newtonian Hele-Shaw flow
Magdalena Constantin, Michael Widom, Jose A. Miranda
The Saffman-Taylor viscous fingering problem is investigated for the displacement of a non-Newtonian fluid by a Newtonian one in a radial Hele-Shaw cell. We execute a mode-coupling…
Delocalization in harmonic chains with long-range correlated random masses
F. A. B. F. de Moura, M. D. Coutinho-Filho, E. P. Raposo +1
We study the nature of collective excitations in harmonic chains with masses exhibiting long-range correlated disorder with power spectrum proportional to , where is the…
On the entropy of the Viana-Bray model
J. R. L. de Almeida
The entropy of the Viana-Bray model at zero temperature and external field is calculated within the solution which takes into account only delta functions for the global order para…
Delocalization and spin-wave dynamics in ferromagnetic chains with long-range correlated random exchange
F. A. B. F. de Moura, M. D. Coutinho-Filho, E. P. Raposo +1
We study the one-dimensional quantum Heisenberg ferromagnet with exchange couplings exhibiting long-range correlated disorder with power spectrum proportional to , where …
A simple model for dynamical melting of moving vortex lattices interacting with periodic pinning
Clécio C. de Souza Silva, Gilson Carneiro
Melting of moving vortex lattices in clean superconducting films with periodic pinning is studied by a dynamical "cage" model, based on a mean-field treatment of Langevin's equatio…
Analytical approach to viscous fingering in a cylindrical Hele-Shaw cell
Jose A. Miranda
We report analytical results for the development of the viscous fingering instability in a cylindrical Hele-Shaw cell of radius a and thickness b. We derive a generalized version o…