# 30.1.21 Carreau

## Function

$y=A_{2}+(A_{1}-A_{2})[1+(tx)^{a}]^{\frac{n-1}{a}}$

## Brief Description

Carreau-Yasuda model to describe pseudoplastic flow with asymptotic viscosities at zero and infinite shear rates.

## Parameters

Number: 5

Names: A1, A2, t, a, n

Meanings: A1 = zero shear viscosity, A2 = infinite shear viscosity, t = time constant, a = transition control factor, n = power index

Lower Bounds: A1 > 0, A2 > 0, t > 0, a > 0, n >= 0

Upper Bounds: none

## Script Access

nlf_Carreau(x,A1,A2,t,a,n)

## Function File

fitfunc\Carreau.fdf

Rheology