Nonlinear interfacial instability in two-fluid viscoelastic Couette flow
نویسندگان
چکیده
منابع مشابه
Strongly Nonlinear Nature of Interfacial-surfactant Instability of Couette Flow
Nonlinear stages of the recently uncovered instability due to insoluble surfactant at the interface between two fluids are investigated for the case of a creeping plane Couette flow with one of the fluids a thin film and the other one a much thicker layer. Numerical simulation of strongly nonlinear longwave evolution equations which couple the film thickness and the surfactant concentration rev...
متن کاملViscoelastic Taylor-Couette instability of shear banded flow.
We study numerically shear banded flow in planar and curved Couette geometries. Our aim is to capture two recent observations in shear banding systems of roll cells stacked in the vorticity direction, associated with an undulation of the interface between the bands. Depending on the degree of cell curvature and on the material's constitutive properties, we find either (i) an instability of the ...
متن کاملSolitary vortex couples in viscoelastic Couette flow
We report experimental discovery of a localized structure, which is of a new type for dissipative systems. It appears as a solitary vortex couple (”diwhirl”) in Couette flow with highly elastic polymer solutions. A unique property of the diwhirls is that they are stationary, in contrast to the usual localized wave structures in both Hamiltonian and dissipative systems which are stabilized by wa...
متن کاملInstability of Plane Couette Flow
The energy gradient theory has been proposed with the aim of better understanding the mechanism of flow transition from laminar flow to turbulent flow. In this theory, it is suggested that the transition to turbulence depends on the relative magnitudes of the energy gradient amplifying the disturbance and the viscous friction damping that disturbance. For a given flow geometry and fluid propert...
متن کاملSimulation of Viscoelastic Fluids: Couette–Taylor Flow
We present a numerical scheme for viscoelastic flow based on a second-order central differencing method recently introduced in the context of incompressible newtonian flow; the incompressibility constraint is treated with the projection method. The result is a simple and efficient scheme that is readily adaptable to a wide class of differential constitutive equations and flow geometries. We imp...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Non-Newtonian Fluid Mechanics
سال: 2018
ISSN: 0377-0257
DOI: 10.1016/j.jnnfm.2017.11.004