Periodic spinodal decomposition in a binary fluid under shear

D. Beysens , F. Perot

Light scattering techniques have been used to study the phase separation of a sheared binary fluid of nitrobenzene and n-hexane at critical composition. Shear was seen to prevent the development of decomposition. The system is quenched when the shear is removed, allowing anisotropic spinodal decomposition rings to appear. When a periodic (frequency Ω) shear was applied, a permanent anisotropic ring pattern was formed. The radius of the ring, in units of the correlation length, exhibits a scaled behaviour versus Ω-1 or the time t after the quench, if Ω-1 or t are expressed in units of the fluctuation lifetime. Mean-field theory seems to be relevant.

Mots clés: critical mixtures; light scattering; organic compounds; spinodal decomposition; nitrobenzene n hexane; binary fluid; phase separation; sheared binary fluid; critical composition; anisotropic spinodal decomposition rings; fluctuation lifetime

Domaines: Articles anciens

D. Beysens, F. Perot. Periodic spinodal decomposition in a binary fluid under shear. Journal de Physique Lettres, 1984, 45 (1), pp.31-38. ⟨10.1051/jphyslet:0198400450103100⟩. ⟨jpa-00232305⟩