Biomedical Engineering Reference
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FIGURE 6.28
Droplets form with flow-focusing configuration.
FIGURE 6.29
Model of formation of liquid droplets in shearing regime.
coefficient
C
S
depends on the contact angle and the shape of the injection port. In this model,
C
S
is
assumed to be constant. We assume for
C
D,
the drag coefficient of a hard sphere at a low Reynolds
number Re:
24
Re
:
C
D
¼
(6.17)
The effective drag interfacial
A
D
grows with the droplet. Assuming that the droplet is a sphere, the
effective drag surface at the detachment moment is
D
d
2
A
D
¼
p
(6.18)
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