Table 2.

Central composite design layout with the measured PWP values.

Run	Dope solution flow rate (ml/min)	Bore fluid flow rate (ml/min)	Air gap distance (cm)	AC-MgO concentration (wt%)		PWP (L/m2.h.bar)
S1	2.5	6.5	42	0.18		22.5862 ± 1.2501
S2	2.5	6.5	22	0.18		22.2255 ± 1.0532
S3	2.5	6.5	22	0.18		25.8787 ± 0.9345
S4	2.5	6.5	22	0.18		19.2058 ± 0.8548
S5	2.5	6.5	22	0.18		18.5656 ± 1.1521
S6	2.5	6.5	22	0.18		17.9255 ± 1.1658
S7	2.5	6.5	22	0.18		17.2853 ± 1.3812
S8	2.5	6.5	2	0.18		3.19596 ± 1.0259
S9	3.5	6.5	22	0.18		20.9336 ± 1.1721
S10	2.5	9.5	22	0.18		20.1812 ± 1.1259
S11	2.5	3.5	22	0.18		10.0456 ± 0.8441
S12	1.5	6.5	22	0.18		15.4562 ± 0.9548
S13	2	8	12	0.27		18.2158 ± 0.8521
S14	3	8	12	0.27		26.3672 ± 1.1597
S15	2	5	12	0.27		8.40641 ± 1.0025
S16	3	5	12	0.27		16.6301 ± 1.8546
S17	2	8	32	0.27		37.8696 ± 1.0234
S18	2	5	32	0.27		25.7778 ± 1.2255
S19	3	5	32	0.27		37.9751 ± 0.8155
S20	3	8	32	0.27		47.7107 ± 0.7544
S21	3	8	12	0.09		12.4712 ± 1.1288
S22	3	5	12	0.09		15.2051 ± 1.0033
S23	2	8	12	0.09		10.4522 ± 0.9547
S24	2	5	12	0.09		16.7426 ± 1.2537
S25	2	5	32	0.09		24.3416 ± 0.8546
S26	3	5	32	0.09		22.4909 ± 1.2351
S27	3	8	32	0.09		31.1026 ± 1.1565
S28	2	8	32	0.09		24.6475 ± 1.3021
S29	2.5	6.5	22	0.36		50.7385 ± 0.9658
S30	2.5	6.5	22	0		29.987 ± 1.2026