Numerical Simulation and Sensitivity Analysis Using RSM on Natural Convective Heat Exchanger Containing Hybrid Nanofluids

Table 5

Codded levels for input factors.

Factors	Level
	−1 (lowest)	0 (medium)	1 (highest)
Ra	10^3	500,500	10^6
Ha	0	50	100
ϕ	0	0.03	0.06