Chemistry Reference
In-Depth Information
1000
8
7
6
5
4
3
2
100
8
7
6
5
VMWO fi
l
m thic
k
nes
s
at
4
0 N l
o
a
d
'40 º
C
'
'70
º
C'
4
3
2
9
0.01
2
3
4
5
6
7
8
9
2
3
4
5
6
7
8
9
0.1
Entrainment speed, m/s
Figure 10.11 Effect of entrainment speed and temperature on film thickness of
valeroyl milkweed oil.
with increasing entrainment speed and decreasing temperature. This is
illustrated by the data in Figure 10.11 which compares the film thickness of
VMWO as a function of entrainment speed at 40 and 70 1C. The data in
Figure 10.11 was obtained at a load of 40 N. As can be seen, the film
thickness of VMWO increased with increasing entrainment speed and de-
creasing temperature. Similar profiles were obtained for the film thickness
of AMWO as a function of entrainment speed and temperature.
The effect of load on film thickness is illustrated in Figure 10.12. The
obtained data is for VMWO measured at 70 1C, at four different loads: 10, 20,
30, and 40 N. The data clearly show that the film thickness of VMWO is
independent of the applied load. Similar results were obtained for AMWO.
This observation is consistent with those generally observed for lubricating
oils, which display little or no change with varying load.
15
The effect of chemical structure on film thickness is illustrated in
Figure 10.13, where film thickness data for milkweed AMWO and VMWO are
compared. The points in Figure 10.13 are measured film thickness data at
20 N of load, at 70 1C. Examination of the data in Figure 10.13 clearly shows
that at both temperatures, AMWO produces a much thicker film than
VMWO. Similar
results were obtained for
these two oils at other
temperatures.
The difference in the film-forming properties between these two oils is
related to their difference in chemical structure. These two milkweed
