Fig. 16.20 Sinusoidal roughness. Plot of cos(x)cos( y) representing rough surface

0.0

0.005

0.010

0.015

0.020

0.025

0.030

0.035

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

δ

D

rectangular

5

5

10

15

20

25

Fig. 16.21 Diffusion

coefficient as function of z by

including roughness of

the wall

16

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