Maybe viscosity in drilling fluid is the most important parameter because cutting removal from well are task of viscose fluid. If viscosity of fluid is less than particular value, cutting will settle down in well and drilling operation will be stopped. In this study, synthesis of Alumina/Polyacrylamide nanocomposite through solution polymerization method was performed. Rheological behavior of m...

Maybe viscosity in drilling fluid is the most important parameter because cutting removal from well are task of viscose fluid. If viscosity of fluid is less than particular value, cutting will settle down in well and drilling operation will be stopped. In this study, synthesis of Alumina/Polyacrylamide nanocomposite through solution polymerization method was performed. Rheological behavior of m...

A smoothed particle hydrodynamics approach is utilized to model a non-Newtonian fluid with a spatially varying viscosity. In the limit of constant viscosity, this approach recovers an earlier model for Newtonian fluids of Español and Revenga (Phys Rev E 67:026705, 2003). Results are compared with numerical solutions of the general Navier–Strokes equation using the “regularized” Bingham model of...

In this paper we study a start-up shear flow of recently proposed model shear-thinning fluid that mimics the response class viscoplastic materials, namely between parallel plates, one which is fixed and other started impulsively. simple flows while generalized viscosity blows up, stress yet finite thus able to mimic fluids. The analytical solution velocity profile obtained using semi-inverse ap...

We present an experimental and theoretical study of Rayleigh–Bénard convection in shear-thinning fluids with temperature-dependent properties. Experiments were performed using a cylindrical cell radius R̂=60 mm height adjustable at d̂=15 20 giving radius-to-height ratio L = 4 3, respectively. The used are glycerol (Newtonian fluid) aqueous xanthan gum solutions (shear-thinning fluids) 1000 1200 p...

We introduce computational methods for rheological studies of soft materials and complex fluids. The approach allows for investigations of the roles played by the microstructure interactions and kinetics and by the dynamics of the fluid. The approach takes into account consistently the elastic mechanics of the microstructures, hydrodynamics, and thermal fluctuations. To study rheological respon...

We investigate mixing in a viscoelastic and shear-thinning fluid-a very common combination in polymers and suspensions. We find that competition between elastic and viscous forces generates self-similar mixing, lobe transport, and other characteristics of chaos. The mechanism by which chaos is produced is evaluated both in experiments and in a simple model. We find that chaotic flow is generate...

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 visco...