Table 1 Relative difference in bearing characteristics for concave bearing surface shape with and without lubricant additives⁴⁰.

\(\varepsilon\)	Surface geometry		Nanofluid lubricant		Combination of the two
\(\varepsilon\)	\(\% \,W_{\,g}\)	\(\% \,C_{f\,g}\)	\(\% \,W_{\,n}\)	\(\% \,C_{f\,n}\)	\(\% \,W_{\,gn}\)	\(\% \,C_{f\,g\,n}\)
0.2	38.412	− 9.253	16.611	− 0.003	61.404	− 9.255
0.3	38.489	− 9.303	16.611	− 0.00376	61.494	− 9.307
0.4	39.647	− 10.056	16.611	− 0.0042	62.844	− 10.06
0.5	41.553	− 11.268	16.611	− 0.0039	65.067	− 11.271
0.6	38.403	− 9.247	16.611	− 0.00294	61.394	− 9.25
0.7	43.767	− 12.635	16.611	− 0.00138	67.649	− 12.636
0.8	37.2	− 8.448	16.611	− 0.00225	59.991	− 8.45
0.9	37.191	− 8.453	16.611	− 0.0256	59.98	− 8.519
			TiO₂ lubricant additive: ϕ = 0.005 and β = 7.77

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