Table 4 Range of independent factors and their levels to assess Nusselt number.
Codes | Parameter | Levels | ||
|---|---|---|---|---|
Low_(− 1) | Middle_(0) | High_(+ 1) | ||
\(A\) | \(0.1 \le Rd \le 0.3\) | 0.1 | 0.2 | 0.3 |
\(B\) | \(0.2 \le Nb \le 0.4\) | 0.2 | 0.3 | 0.4 |
\(C\) | \(0.1 \le Nt \le 0.3\) | 0.1 | 0.2 | 0.3 |