Variable 
Description 
Units ( = seconds, = meters, = Pascals) 

Shear stress 


Consistency index 

Shear rate 

Shear thinning index 
Unitless 
Variable 
Description 
Units ( = seconds, = meters, = Pascals) 
Shear rate at the wall 

Flow behaviour index (shear thinning index) 
Unitless 

Volumetric flow rate 

Radius of the cylinder 

Pressure drop 

Length of the flow path 

Flow consistency index 
Variable 
Description 
Units ( = seconds, = meters, = Pascals) 
Volumetric flow rate 

Radius of the cone at the outled end 

Radius of the cone at the inlet end 

Flow behaviour index (shear thinning index) 
Unitless 

Pressure drop 

Length of the flow path 

Flow consistency index 
Variable 
Description 
Units ( = seconds, = meters, = Pascals) 
Shear rate at the wall 

Flow behaviour index (shear thinning index) 
Unitless 

Width of the slot (major dimension of the
slot) 

Height of the slot (minor dimension of the
slot) 

Volumetric flow rate 

Pressure drop 

Length of the flow path 

Flow consistency index 

Correction factor for a narrow slot 
Unitless 
Variable 
Description 
Units ( = seconds, = meters, = Pascals) 
Shear rate at the wall  
Flow behavior index (shear thinning index) 
Unitless 

Volumetric flow rate 

Diameter of the center of the annulus (=(outer annulus diameter + inner annulus diameter)/2) 

Height of the annulus (= (outer annulus
radius – inner annulus radius) 

Outer annulus radius 

Inner annulus radius 

Radius of the center of the annulus (= (outer annulus radius + inner annulus radius)/2) 

Pressure drop 

Length of the flow path 

Flow consistency index  
Correction factor for a wide annulus 
Unitless 