Magnetorheological (MR) fluids with Fe3O4 particles are widely studied nowadays due to their soft magnetic nature, controllable morphology, and better chemical stability as compared metallic counterpart. However, they can be even more advantageous under Zn doping elevated magnetization hollow configuration low density, making them active, stable, dispersible in the carrier fluid. Here, we repor...

Abstract Rheological properties of concrete are considered to be the most ideal method characterize working performance concrete. models used quantitatively based on yield stress and viscosity fresh cement paste. In this paper, Rheology QC was study influence different main link densities (acid-ether ratios) rheological The Bingham model fit curve slurry, stress, plastic viscosity, thixotropic ...

Most earlier thixotropic elasto-visco-plastic models follow the quasi-static pre-yielding linear elastic assumption of Oldroyd's 1946 model. To develop a new model, present work considers more realistic non-linear visco-elastic and plastic deformation. Our model is valid for reversible (finite time scale) irreversible (infinite materials. Despite being simple algebraic equation, our appropriate...

We have developed and tested a numerical model for turbulence resolving simulations of dense mud–water mixtures in oscillatory bottom boundary layers, based on low Stokes number formulation the two-phase equations. The resulting non-Boussinesq equation fluid momentum is coupled to transport mud volumetric concentration, giving rise volume-averaged velocity that non-solenoidal, was implemented a...

In this study, the effects of blast furnace slag (BFS) and calcite on rheological properties self-compacting concrete (SSC) in meso macro scales were investigated. During preparation replicate samples, while BFS was replaced with cement at rate 10%, 20%, 30%, 40% by weight, added to 15%, 25% weight. The (plastic viscosity yield point) mini-slump flow values paste prepared determined. fresh cons...

A mathematical analysis has been carried out for the axial flow of a Bingham plastic fluid, in the Concentric Cylinder Viscometer which consists of a cylindrical sample holder (the cup) and a cylindrical spindle (the bob) coaxial with the cup. The fluid to be tested flows through the annular gap of the cup and the bob system, sheared by the rotation of the inner cylinder, while the outer cy...

The nanosized magnetite particles were synthesized by means of a coprecipitation method and used to prepare the aqueous ferrofluids with various volume fractions. The magnetorheological properties of the aqueous ferrofluids have been investigated as a function of magnetic field. Under steady-state shear, the apparent viscosity for all of the ferrofluids exhibited a shear thinning behavior. But ...