Table 4 Values of $\mathbf{N}{\mathbf{u}}_{\mathbf{x}}{\mathbf{Re}}_{\mathbf{x}}^{\mathbf{-}\mathbf{1}\mathbf{/}\mathbf{2}}$ for some values of ε and φ

Cu-water

Al ₂ O ₃ -water

TiO ₂ -water

Cu-water

Al ₂ O ₃ -water

TiO ₂ -water

0.8385

0.7272

0.7082

1.0802

0.8878

0.8423

1.4043

1.3305

1.3010

1.4043

1.3305

1.3010

1.6692

1.5352

1.4691

1.6692

1.5352

1.4691

1.8724

1.8278

1.7898

2.1577

2.0700

1.9867