Table 2 Process variables and their levels in the Box-Behnken design, along with the corresponding response values for the drag reduction rate (DR) of sodium alginate.

From: Experimental study on the drag reduction performance of sodium alginate in saline solutions

A:Cs (%)

B:Cp (ppm)

C: Q (ml/min)

DR (%)

3

1500

400

14.84

6

1000

400

12.79

9

1000

450

8.59

3

1000

450

14.11

6

1500

450

12.67

9

500

400

5.75

3

1000

350

19.3

6

1000

400

12.79

6

1500

350

6.66

6

1000

400

12.79

6

500

350

15.44

3

500

400

7.4

9

1000

350

8.45

6

500

450

3.5

9

1500

400

3.09