Table 4 Values related to the skin friction for different values of n.

Cu

Al ₂ O ₃

TiO ₂

0

0.737218

0.626792

0.633534

1

1.174748

0.998779

1.009523

2

1.293408

1.099665

1.111494

3

1.349309

1.147192

1.159532

4

1.381883

1.174886

1.187525

5

1.403223

1.193030

1.205863

10

1.450669

1.233367

1.246635

20

1.477159

1.255889

1.269399

50

1.494071

1.270267

1.283932

100

1.499890

1.275215

1.288933