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Fig. 9 Evolution of
“
large
”
droplet diameters of the indicated initial values showing the effect of
an 80-
m support
fiber using the experimental design of Fig.
6
on the ISS (Liu et al.
2014b
). The
ratio of droplet diameter of the
fiber is large enough for no in
μ
uence of a
ber to have been
anticipated. The clear deviation of the burning rate of the
fiber-supported droplet from the free
droplet is attributed to the onset of convection and the vortical motions shown in Fig.
8
fl
5 Visualization of the Droplet Burning Process
The main diagnostic for the droplet burning experiments discussed here is photo-
graphic. Figure
10
shows the burning history of a backlighted unsupported
n-heptane droplet that illustrates development of the soot shell for D
o
= 0.76 mm
(Jackson and Avedisian
1998
). The
fl
flame is not visible in this sequence as is typical
Fig. 10 Selected images from an unsupported droplet burning sequence for n-heptane
(D
o
= 0.76 mm) showing development of the soot shell (Jackson and Avedisian
1998
). Flame
is also visible in this sequence. Camera marker on the film is at the bottom of the photographs
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