Shear-induced quench of long-range correlations in a liquid mixture

Abstract

A static correlation function of concentration fluctuations in a (dilute) binary liquid mixture subjected to both a concentration gradient and uniform shear flow is investigated within the framework of fluctuating hydrodynamics. It is shown that a well-known $|\nabla c{|}^2/k^4$ long-range correlation at large wave numbers $k$ crosses over to a weaker divergent one for wave numbers satisfying $k<(\dot{\gamma }/D{)}^{1/2}$, while an asymptotic shear-controlled power-law dependence is confirmed at much smaller wave numbers given by $k\ll (\dot{\gamma }/\nu {)}^{1/2}$, where $c$, $\dot{\gamma }$, $D$ and $\nu$ are the mass concentration, the rate of the shear, the mass diffusivity and the kinematic viscosity of the mixture, respectively. The result will provide for the first time the possibility to observe the shear-induced suppression of a long-range correlation experimentally by using, for example, a low-angle light scattering technique.

8pages, 2figures

References in corpus (4)

• Soret driven convection in a colloidal solution heated from above at very large solutal Rayleigh number
• Anomalous Pressure in Fluctuating Shear Flow
• Long-Ranged Correlations in Sheared Fluids
• A schlieren method for ultra-low angle light scattering measurements

Cited by in corpus (4)

• Long-range phase order in two dimensions under shear flow
• Molecular dynamics study of shear-induced long-range correlations in simple fluids
• Spatial correlations of hydrodynamic fluctuations in simple fluids under shear flow: A mesoscale simulation study
• Analytical and Computational Studies of Correlations of Hydrodynamic Fluctuations in Shear Flow