Table 1.

Flow velocity measurements in vessels with different structures, as shown in Fig. 4.

Corresponding figures	d(μm)	Δt (ms)	v(mm/s)
(a) and (d)	7.8	2.3	3.4
(b) and (e)	3.2	13.9	0.23
(c) and (f)	5.8	55.1	0.11