SAMPE Journal - July/August 2020 - 25

Figure 9. Images showing the surface covered by the droplet over the topographical map of the fiber
bed for all five samples. Times of each contour are at 10, 100, 500, 1000, 2000 seconds after droplet
deposition, as well as at the last moment at which the droplet can be observed, as shown in Figure 8.

directly in the boundary between two tows and
spreading of the droplet follows the boundary line
closely, with even less spreading across the fibers
than the other unidirectional cases, as the droplet
is absorbed between the two tows.
CONCLUSIONS
Based on the small number of tests performed for
this paper, it can be clearly seen that the weave that
is chosen for the fiber bed significantly affects the
overall shape of the droplet as it spreads. Unidirectional fiber beds display a spreading that is dominated by the direction of the fibers. Plain weave
exhibits nearly uniform spreading, except for the
pinholes, which divert flow momentarily. Twill
weave, however, inhibits spreading of the fluid
along the surface, the rougher surface than plain
weave preventing proper flow along the surface.
The fact that the plain weave fabric used in this
study is particularly lightweight and has a tight
weave and small tow size when compared to the
twill weave fabric shows the importance of fiber
bed detail size when compared to droplet detail

w w w. s a m p e . o r g

size. If the droplets are large enough, it is possible
that a weave such as a twill can result in full droplet
spreading.
Yet another factor that shows the importance of
fiber weave for droplet spreading and imbibition is
the fact that using a fabric with half the areal weight
did not significantly change the results observed
for the UD-NCF samples. In both "height vs time"
and "area-covered vs time", both UD-NCF samples
exhibited nearly identical behavior, with a minor
difference in time to full sorption being the only
significant difference between them.
Future Work
A separate study is already underway, looking
deeper into the effect of fabric areal weight and
surface flow, as was seen in this study between the
two UD-NCF samples.
Furthermore, this study was observing only fluid on and above the surface, with the flow within
the fiber bed being unobserved. Given that the
original motivation behind this study is to increase
the degree of impregnation of discontinuous reser-

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SAMPE Journal - July/August 2020

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