Experimental Study of Rheological Behavior of MWCNT-Al2O3/SAE50 Hybrid Nanofluid to Provide the Best Nano-lubrication Conditions

Table 5 Statistical data on the relative viscosity of nano-lubricants

Nano-lubricant	\(\dot{\gamma }\)(s⁻¹)	T (°C)	\(\frac{{\mu }_{\rm nf}-{\mu }_{bf}}{{\mu }_{bf}}\times 100\)(%)
Nano-lubricant	\(\dot{\gamma }\)(s⁻¹)	T (°C)	\(\varphi =0.0625\mathrm{\%}\)	\(\varphi =0.125\mathrm{\%}\)	\(\varphi =0.75\mathrm{\%}\)	\(\varphi =1\mathrm{\%}\)
MWCNT-Al₂O₃ (50%-50%)/SAE50	3999 (300 rpm)	25	0.86	1.04	1.17	1.24
		30	0.86	1.05	1.15	1.21
		35	0.84	1.01	1.11	1.16
		40	0.85	1.01	1.10	1.14
	6665 (500 rpm)	30	0.85	1.04	–	–
		35	0.83 (− 17%)	1.01	1.11	1.16
		40	0.84	1.01	1.10	1.15
		45	0.84	1.01	1.08	1.14
		50	0.85	1.01	1.09	1.15