An empirical equation for shear viscosity of shear thickening fluids
نویسندگان
چکیده
Quantitative modelling of the rheology non-Newtonian fluids requires significant empirical input due to very complex behaviour bulk fluid as a result particle-scale physics fluids. The existing models are mainly limited certain dynamics conditions such shear rate, stress, etc. Adopting Doolittle's free volume theory approach, we have proposed an equation describe relative volume-dependent viscosity, stress-dependent rate-dependent and dimensionless Péclet number-dependent viscosity thickening formulae predict all rheologically different behaving Newtonian, intermediate thinning, extreme thinning regimes shear-thickening been validated against experimental rheological data various over range pH, fraction, electrolyte concentration, temperature, magnetic field. results suggest that predicted threshold material parameters help quantitatively evaluate effect varying physico-chemical on We simulated flow fluid, modelled using equation, in 2D staggered porous medium. observed bimodal distribution pore-scale velocity
منابع مشابه
Simulating the Dynamic Behavior of Shear Thickening Fluids
While significant research has been dedicated to the simulation of fluids, not much attention has been given to exploring new interesting behavior that can be generated with the different types of non-Newtonian fluids with non-constant viscosity. Going in this direction, this paper introduces a computational model for simulating the interesting phenomena observed in non-Newtonian shear thickeni...
متن کاملstability of shear-thickening and shear-thinning fluids in narrow gap between rotating cylinders
the effect of weak shear thickening and shear thinning on the stability of the taylor-couette flow is explored for a carreau-bird fluid in the narrow-gap limit. the galerkin projection method is used to derive a low-order dynamical system from the conservation of mass and momentum equations. in comparison with the newtonian system, the present equations include additional nonlinear coupling in ...
متن کاملMicromechanics of Composites with Integrated Shear Thickening Fluids
Shear thickening fluids (STFs) are typically composed of a concentrated stabilized dispersion of rigid sub-micron particles in a carrier fluid and show a marked increase in viscosity beyond a critical shear rate [1]. It has been demonstrated that STFs can be integrated in dynamically loaded structures to tailor their damping and stiffness properties [2]. Potential applications are alpine skis w...
متن کاملShear-Thickening Fluid
Shear-Thickening Fluids (STFs) are a special Non-Newtonian Fluid that act like a solid when they experience a force. A simple example of this is a mixture of cornstarch and water. In this experiment, I text this mixture’s STF properties by using a ball drop to simulate an impact. By varying the ball drop height (and thus the force upon impact), and observing the bounce height, I determined wher...
متن کاملShear thickening of cornstarch suspensions
We study the rheology of cornstarch suspensions, a non – Brownian particle system that exhibits discontinuous shear thickening. Using Magnetic Resonance Imaging (MRI), the local properties of the flow are obtained by the determination of local velocity profiles and concentrations in a Couette cell. For low rotational rates, we observe shear localization characteristic of yield stress fluids. Wh...
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 Molecular Liquids
سال: 2021
ISSN: ['0167-7322', '1873-3166']
DOI: https://doi.org/10.1016/j.molliq.2020.115220