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TABLE 75
(from Çengel and Cimbala,
Fluid Mechanics: Fundamentals and Applications
, McGrawHill, 2006)
Some common established nondimensional parameters or
Π
s encountered in fluid mechanics and heat transfer;
A
is a
characteristic area,
D
is a characteristic diameter,
f
is a characteristic frequency (Hz),
L
is a characteristic length,
t
is a
characteristic time,
T
is a characteristic (absolute) temperature,
V
is a characteristic velocity,
W
is a characteristic width,
is a characteristic power,
ω
is a characteristic
radial
frequency or angular velocity (radians/s). Other parameters and
fluid properties in these
Π
s include:
c
= speed of sound,
c
p
,
c
v
= specific heats,
d
p
= particle diameter,
D
AB
= species
diffusion coefficient,
h
= convective heat transfer coefficient,
h
fg
= latent heat of evaporation,
k
= thermal conductivity and
also
k
= ratio of specific heats,
P
= pressure,
T
sat
= saturation temperature,
= volume flow rate,
α
= thermal diffusivity,
β
= coefficient of thermal expansion,
λ
= mean free path length,
μ
= viscosity,
ν
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This note was uploaded on 07/23/2008 for the course ME 345 taught by Professor Staff during the Spring '08 term at Pennsylvania State University, University Park.
 Spring '08
 staff
 Heat Transfer

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