Biomedical Engineering Reference
In-Depth Information
We propose to perform the fine filtration of liquids and gases having a high
relation of throughput to pressure drop with a huge number of special microrings
pressed on to each other. Filters based on such microrings can be made by MET.
Below, we present the design of such filters.
8.9.2 Design of Filters with a High Relation of Throughput
to Pressure Drop
The proposed filter contains a case, an inlet, an outlet, a flush valve, and a huge
number of microrings assembled into columns (Fig.
8.40
). Liquid (or gas) goes
through the inlet and comes into the internal space of the microring columns. After
this, it travels through slits between microrings and comes out through the outlet.
Hard particles are held back in the internal space of the microring columns. To
remove hard particles from the internal space of the microrings, it is necessary to
open the flush valve. A liquid (or gas) flow directed from the inlet to the flush valve
will remove the sediment. Ultrasound vibration could be applied for better cleaning
of the internal space.
To estimate the main parameters of the filter, let us consider the slit between a
pair of microrings (Fig.
8.41
). Let the narrowest part of the slit have width
W
and
the widths of other parts of the slit be calculated as:
xr
ðÞ¼
W
þ
k
1
ð
r
3
r
Þ
for
r
3
>
r
r
4
;
(8.115)
xr
ðÞ¼
W
þ
k
2
ð
r
r
3
Þ
for r
2
>
r
r
3
;
(8.116)
xr
ðÞ¼
W
þ
k
2
ð
r
2
r
3
Þ þ
k
3
ð
r
r
2
Þ
for r
1
>
r
r
2
;
(8.117)
Fig. 8.40 Filter design
