Two-state shear diagrams for complex fluids in shear flow
نویسندگان
چکیده
منابع مشابه
Turbulent pipe flow of shear-thinning fluids
Direct numerical simulation of the weakly turbulent flow of non-Newtonian fluids is undertaken for two different generalised Newtonian rheology models using a spectral element-Fourier method. Results for a power law (shear-thinning) rheology agree well with experimentally determined logarithmic layer correlations and with other previously published experimental work. As the flow index becomes s...
متن کاملPhenomenology and physical origin of shear-localization and shear-banding in complex fluids
We review and compare the phenomenological aspects and physical origin of shear-localization and shear-banding in various material types, namely emulsions, suspensions, colloids, granular materials and micellar systems. It appears that shear-banding, which must be distinguished from the simple effect of coexisting static-flowing regions in yield stress fluids, occurs in the form of a progressiv...
متن کاملX-ray Couette shear cell for nonequilibrium structural studies of complex fluids under flow
We have designed and constructed a sealed, temperature-controlled Couette-type shear cell which allows us to carry out in situ synchrotron x-ray scattering studies of the nonequilibrium structures of complex fluids under flow, probing lengths ranging from the nanometer to the semimacroscopic micron scale. The sealed design allows the cell to be tilted, facilitating the scanning of all direction...
متن کاملRecent Developments in Shear and Extensional Microrheometry of Complex Fluids
We review the design and construction of several new microrheometers designed to facilitate the study of non-Newtonian fluids using very small sample volumes (1-10 μl) and on length scales of micrometer dimensions. These devices enable both the steady shear and transient extensional rheological properties of complex fluids to be measured. The shear-rate-dependent viscosity and gap-dependent yie...
متن کاملYieldlike constitutive transition in shear flow of entangled polymeric fluids.
We describe an unexpected constitutive transition in entangled polymer solutions. At and beyond a critical stress, the initial spatially homogeneous and well-entangled sample transforms from its entangled (coiled) state into a fully disentangled (stretched) state over a period during which the resulting shear rate increases in a spatially inhomogeneous fashion. In the mode of controlled shear r...
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: Europhysics Letters (EPL)
سال: 1999
ISSN: 0295-5075,1286-4854
DOI: 10.1209/epl/i1999-00486-2