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Fuel Cells
book

Fuel Cells

by Shripad T. Revankar, Pradip Majumdar
May 2014
Beginner to intermediate content levelBeginner to intermediate
748 pages
23h 13m
English
CRC Press
Content preview from Fuel Cells
220 Fuel Cells
The friction for laminar ow in a circular channel is given by
f
Re
D
=
64
. The
friction factor for a rectangular channel depends on the aspect ratio, b/a. For
example, it varies from
fRe
D
H
= 57
for an aspect ratio of b/a = 1 to
fRe
D
H
= 96
for an aspect ratio of b/a = ∞. A correlation of
fReba
D
H
(/)
for laminar ow in
a rectangular channel is given as
fRe
b
a
b
a
D
H
=−
+
24 113553 1 9467 1 7012
2
.. .
bb
a
b
a
b
a
+
345
0 9564 0 2537
..

.
(6.9)
As we have mentioned before, the pressure drop in the reactant gas ow
channels plays a critical role in the operation and performance of a fuel cell.
The higher the pressure ...
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Publisher Resources

ISBN: 9781420089684