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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
240 Fuel Cells
where
′′
m
i
= mass diffusion ux of species i (kg/m
2
· s)
ρ
i
= mass concentration or density of species i (kg/m
3
)
ρ = total mass density (kg/m
3
)
x
i
= mass fraction of i
Diffusion mass transfer exists in all phases, that is, in gases, liquids, and
solids, with a higher order of magnitude in gases than in liquids and a higher
order of magnitude in liquids than in solids.
6.3.1.1.1 Binary Diffusion
For binary diffusion with only two species a and b present in a mixture, the
diffusion coefcient is expressed as D
ab
. For example, if a humidied hydro-
gen gas is supplied as fuel, then the binary diffusion involves two species,
hydrogen ...
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Publisher Resources

ISBN: 9781420089684