# What is the consistency index rheology?

## What is the consistency index rheology?

The consistency index parameter (K) gives an idea of the viscosity of the fluid. However, to. be able to compare K-values for different fluids they should have similar flow behaviour. index (n). When the flow behaviour index is close to 1 the fluid´s behaviour tends to pass.

## What is consistency factor?

The parameter K, (consistency factor) is the shear strength at a shear rate of 1.0s−1 and is usually expressed in lb/100ft2 or dynes/cm2, and corresponds approximately to a relative viscosity at 1.0s−1.

What is consistency index in drilling fluid?

The consistency index of a drilling fluid is a rheological property related to the cohesion of the individual particles of the fluid, its ability to deform, and its resistance to flow.

Is consistency the same as viscosity?

About the only common characteristic is that all viscosity values change with temperature. Consistency is an attribute that relates to firmness or thickness. The term is used for many materials that flow with the application of only gravitational force.

### Is viscosity a consistency?

When continuous deformation occurs, the fluid tries to oppose this with a frictional resistance. This resistance can be measured in terms of consistency. Consistency of Newtonian fluid is called viscosity. Viscosity is often formulated as the ratio of shear stress to shear rate.

What is a consistency index and what does it measure?

consistency index In cladistic analysis, a measure of homoplasy in a phylogenetic tree (or cladogram), calculated as the number of steps (i.e. character state changes) in the cladogram divided by the smallest possible number of steps. The index therefore runs from 0 to 1.

What is N in Newtonian fluid?

Newtonian fluids are the simplest mathematical models of fluids that account for viscosity. Newtonian fluids are named after Isaac Newton, who first used the differential equation to postulate the relation between the shear strain rate and shear stress for such fluids.

## What is the consistency coefficient of non Newtonian fluid?

The consistency coefficient K measures the average viscosity of the non-Newtonian fluid, and n is the flow behavior index that measures the deviation of the fluid from Newtonian flow. It is the shear-thickening fluid when n > 1, and the shear-thinning fluid when n < 1.

## What is the relationship between consistency coefficient and strain rate?

As the consistency coefficient increases, the expanded bed height increases and the high strain rate region expands within the bed. The region with low strain rate appears near the bed surface, which corresponds to the region with high effective viscosity.

How does the consistency coefficient affect the shear stress?

The increase in the consistency coefficient means that the same change in the shear rate causes a greater change in the shear stress. Numerical simulations show that the bed height increases and the solid volume fraction decreases as the consistency coefficient increases. The particles are fully fluidized by high viscous fluids. Fig. 15.

What is the effect of consistency coefficient on bed surface?

At the bed surface, the solid volume fraction sharply drops to form a clear bed surface. As the consistency coefficient increases, the expanded bed height increases and the average solid volume fraction decreases. With the increase of K, the ratio of hinlet to hbed decreases.