title: Pattern dynamics in a perturbed printer's instability experiment.
abstract: We report experimental results concerning observation of a pattern forming system, subject to directional viscous fingering (printer's instability). This system was excited by a time-dependent, periodic perturbation. A variety of spatiotemporal effects was observed, including pattern transient dynamics, wave vector selection, and morphological transitions. Detailed measurement of pattern shape and its associated Fourier modes assured the detection of a crossover between different regimes of the pattern evolution.
authors.affiliation: Departamento de Física, Universidade Federal de Minas Gerais, Caixa Postal 702, Belo Horizonte, CEP 31.270-901, Brazil. robson@fisica.ufmg.br
authors.forename: R L
authors.initials: RL
authors.lastname: Santos
authors.forename: U
authors.initials: U
authors.lastname: Agero
authors.forename: J M A
authors.initials: JM
authors.lastname: Figueiredo