Manipulation of turbulent flow for drag reduction and heat transfer enhancement 6

Z
0 1.25 2.5 3.75 5 6.25 7.5 8.75 10
ω
x
40
10
4
1.5
0
-1.5
-4
-10
-40
flow dir ection
Plane 2
Plane 1
Plane 7
Plane 4
Plane 6
Plane 5
Plane 3
I
I
II
II
II
1
y0
-1
z
y

(a) h/D = 10%
Z
0 1.25 2.5 3.75 5 6.25 7.5 8.75 10
ω
x
40
10
4
1.5
0
-1.5
-4
-10
-40
flow directi on
Plane 2
Plane 1
Plane 7
Plane 4
Plane 6
Plane 5
Plane 3
I
I
II
II
II
1
y0
-1

z
y
(b) h/D = 20%
Figure 5.13: Streamwise vorticity (ω
x
) and streamlines on different Z-Y
plane slices, red dashed lines refer to boundary of protrusions
209