Hybrid nanofluid 1 II-VI semiconductors 1 Laboratory studies 1 MWCNT's 1 Magnesia 1 Nanofluidics 1 New correlation 1 New correlations 1 RSM 1 Relative thermal conductivity 1 Relative thermal conductivity (RTC) 1 Response-surface methodology 1 Sensitivity analysis 1 Solid volume fraction 1 Ternary hybrid 1 Ternary hybrid nanofluid Ternary hybrid nanofluids 1 Test case 1 Thermal conductivity 1 Zinc oxide 1