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 index of fluids?
Power law fluids are modeled with SS τ being proportional to the SR raised to some exponent n: (6.20) The exponent n is commonly referred to as the “flow behavior index” and k is the “consistency index.” Those values, in turn, may be computed as functions of PV and YP from the Bingham Plastic model as follows: (6.21)
What is consistency index in fluid mechanics?
“k” is known as the “consistency index”, and is indicative of the pumpability of the fluid. “n” is the power index, denoting the degree of how “non-Newtonian” the fluid is. Both parameters can be determined from the Fann VG meter. “k” is defined as the viscosity of a fluid at a shear rate of 1 sec-1.
What is the consistency index K?
K is the Consistency Coefficient with units (Pa sn), and n is the Flow Behavior Index (dimensionless). The K value corresponds to the visc- osity of Newtonian fluids. The pseudoplastic fluids are also known as shear-thinning fluids, since their apparent viscosity decreases as the shear rate is increased.
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 a consistency index?
Consistency Index (CI)- This is a measure of how well an individual character fits on a phylogenetic tree. It is calculated by dividing the minimum possible number of steps by the observed number of steps.
What is consistency ratio?
1. The ratio between the consistency of a given evaluation matrix and the consistency of a random matrix.
What is the toughness index?
Toughness index is defined as the ratio of plasticity index (IP) of the soil to the flow index (IF) of the soil. Toughness index varies between 0 to 3. This gives us an idea of shear strength of soil at its plastic limit.
What does a high consistency index mean?
What are the parameters of the consistency index?
where τ is the shear stress, K is the consistency index, γ˙ is the shear rate, and n is the flow behaviour index. The parameters K and n characterise the rheology of power-law fluids.
What is the formula for the flow consistency index?
K is the flow consistency index (SI units Pa sn), ∂u∂y is the shear rate or the velocity gradient perpendicular to the plane of shear (SI unit s−1), and. n is the flow behavior index (dimensionless).
What is the consistency index of power law?
A 10.5-ppg Power Law fluid with a consistency index of 20 cp equivalent and flow behavior index of 0.8 is circulating at 250 gpm in an 8-¾-in-diameter wellbore. Determine the flow regime inside a 4½-in OD, 16.60-lb/ft drill pipe (3.826-in ID), and in the drill pipe/hole annulus. Since NRe > 3,174, turbulent flow exists inside the drill pipe.
How to find the consistency index of suspension?
According to the criteria in Definition 4.1, the suspension with nominal damping is selected as the reference (nominal case). In Figure 4.4, both ˜Jc and ˜Jrh indexes of the passive nominal damper are equal to 1. Then, according to the results of Figure 4.4, the following remarks hold: