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] |