Biomedical Engineering Reference
In-Depth Information
�
µ
� �
0
F
»
f V M H
Ñ
(
.
)
mag
r
2
(9.60)
When the magnetic field is reversed, the force on the membrane is also reversed and
the membrane oscillates with the external field.
9.13.3.3 Example
In order to obtain a larger deflection, ferromagnetic micromembranes have been
fixed perpendicularly to a solid wall and oscillate like a “fish tail” under the actua-
tion of a pulsating magnetic field (Figure 9.42). It has been shown that such motion
greatly enhances the mixing in the microchamber [31].
Figure 9.42
(left) A view of the microchamber with the four micromembranes, the inlet capillary
can be seen at the top of the picture; (right) view of the membranes during the oscillations (the
electromagnet is the round disk behind the membranes).
