Table 2 Correlation coefficient (R²) and slope of the exponential fitting curve (R₀) for each impinging angle.

R² @R′_0.5

99.98%

99.86%

R₀ @R′_0.5

1.04

1.61

R² @R′_max

99.51%

99.55%

R₀ @R′_max

1.38

1.67

R² @u_{r, max}/U_jet

99.80%

99.87%

R₀ @u_{r, max}/U_jet

− 2.19

− 1.72