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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
230 Fuel Cells
For internal ows, thermal boundary layers develop from both top and bottom
surfaces and develop into two regions: thermal entry length and thermal fully devel-
oped regions similar to hydrodynamic internal ow as shown in Figure 6.8.
Thermal fully developed region: The region where the dimensionless temper-
ature prole remains invariable along the longitudinal length of the channel.
Thermal entry length (L
e,th
): The length required for the dimensionless tem-
perature prole to become fully developed.
Criterion for entry length: Criterion for hydrodynamic entry length for
laminar ow:
L
D
Re
D
e,th
006
..
(6.32)
For example, for a max
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Publisher Resources

ISBN: 9781420089684