Chemistry Reference
In-Depth Information
Fig. 6.4
A model squirmer.
To p
(
left
) a schematic of an axisymmetric surface velocity
u
θ
=
B
1
sin
θ
+
B
2
/
θ
on a sphere.
To p
(
right
) the surface velocity at different relative strengths
of the spherical harmonic modes and (
Bottom
) their corresponding flow fields.
2sin2
β
=
0 corresponds
to a neutral squirmer and
β<
0 is a pusher and
β>
0 is a puller
2
sin
a
3
r
3
,θ)
=−
v
2
v
θ
(
r
+
(θ)
(6.6)
r
3
in three-
As we can see in Eq.
6.6
, the flow field perturbation decays as
∼
1
/
r
2
[
30
]. In order to determine the
flow profile around the swimming drop, we performed
dimensions and in two-dimensions, it decays as
∼
1
/
PIV using a standard setup
(ILA GmbH). The oil phase is seeded with 200 nm green fluorescent polystyrene
beads (Duke Scientific) to be used as tracers. The result is shown in Fig.
6.5
, and
µ
