Table 1. Calculated Parameters for Bentonite/E and Bentonite/W at Different Polymer Concentrations Using Bingham Plastic, Power-Law, and Herschel–Bulkley Models.

		E-AM/AMPS concentration (wt %)				W-AM/AMPS concentration (wt %)
models		0.5	1	1.5	2	0.5	1	1.5	2
Bingham model	τ0	1.52025	2.14563	2.82927	3.58309	1.08489	1.52038	2.16113	1.96954
	μp	0.01034	0.01788	0.02787	0.04168	0.00713	0.01235	0.01809	0.02476
	R2	0.9898	0.98354	0.97741	0.97312	0.99179	0.99299	0.9885	0.99249
	RMSE	0.4043	0.8909	1.63	2.664	0.2498	0.3999	0.7516	0.8302
power-law model	n	0.63811	0.66756	0.68404	0.69888	0.63642	0.69036	0.68279	0.76416
	K	0.13798	0.1905	0.26041	0.34635	0.09674	0.11352	0.17404	0.13242
	R2	0.97735	0.99124	0.99719	0.99965	0.97174	0.98233	0.98557	0.99533
	RMSE	0.6024	0.6499	0.5745	0.306	0.4635	0.6347	0.8417	0.6545
Herschel–Bulkley model	n	0.81914	0.77474	0.74015	0.71639	0.83944	0.84792	0.81879	0.84297
	K	0.03655	0.08641	0.17189	0.30416	0.02185	0.03568	0.0641	0.07408
	τ0	1.08587	1.15883	0.97629	0.46345	0.82505	1.09776	1.40014	1.0896
	R2	0.99967	0.9996	0.9995	0.99985	0.99936	0.99992	0.99759	0.9999
	RMSE	0.07309	0.1391	0.2435	0.2	0.07	0.0424	0.3443	0.09349