Scaling and hydrodynamic effects in lamellar orderingAiguo Xu1, G. Gonnella1, A. Lamura2, G. Amati3 and F. Massaioli3
1 Dipartimento di Fisica, Università di Bari and Center of Innovative Technologies for Signal Detection and Processing (TIRES) and INFN, Sezione di Bari and INFM via Amendola 173, 70126 Bari, Italy
2 Istituto Applicazioni Calcolo, CNR, Sezione di Bari via Amendola 122/D, 70126 Bari, Italy
3 CASPUR - via dei Tizii 6/b, 00185 Roma, Italy
received 7 February 2005; accepted in final form 23 June 2005
published online 20 July 2005
We study the kinetics of domain growth of fluid mixtures quenched from a disordered to a lamellar phase. At low viscosities, in two dimensions, when hydrodynamic modes become important, dynamical scaling is verified in the form , where C is the structure factor with maximum at kM and L is a typical length with logarithmic growth at late times. The presence of extended defects can explain the behavior of L. Three-dimensional simulations confirm that diffuse grain boundaries inhibit complete ordering of lamellae. Applied shear flow alleviates frustration and gives power law growth at all times.
64.75.+g - Solubility, segregation, and mixing; phase separation.
05.70.Ln - Nonequilibrium and irreversible thermodynamics.
47.20.Hw - Morphological instability; phase changes.
© EDP Sciences 2005