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Experimental range and levels of independent parameters.
| Parameters | Symbol | Variable levels |
||
|---|---|---|---|---|
| Low (−1) | Central point (0) | High (+1) | ||
| SHL content [% w/w] | X1 | 35.0 | 37.5 | 40.0 |
| ML content [% w/w] | X2 | 1.0 | 2.0 | 3.0 |
| Applied voltage [kV] | X3 | 9.0 | 18.0 | 27.0 |
| Flow rate [ml/h] | X4 | 0.4 | 0.8 | 1.2 |
