12.10.2. Oka Erosion Model

In the Ansys Fluent implementation of the erosion model by Oka, the erosion rate is determined as:

(12–333)

where

 

= reference erosion rate at 90º impact angle (that is, the wall material mass removed per mass of particles). Note that this quantity is usually derived by measurements (see [486]).

= particle impact velocity

= reference velocity

and = particle diameter and particle reference diameter, respectively

and = velocity and diameter exponents, respectively

= impact angle function

The impact angle dependence of the erosion rate is given by:

(12–334)

where

 

= wall impact angle (rad)

= wall material Vickers hardness (GPa)

and = angle function constants

Table 12.3: Example of the Oka Erosion Model Constants

Constant

Sand - Steel

6.154e-4

1.8 [GPa]

0.8

1.3

2.35

0.19

326 [μm]

104 [m/s]