The drag of an airfoil at zero angle of attack is a function of density, viscosity, and velocity, in addition to a length parameter
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Head
loss and friction factor
1-D energy equation:
T means ‘total’
For fully-developed flow through
a constant-diameter pipe
,
and
if the pipe is horizontal
,
(i)
Consider flow in a straight pipe:
Free-body
diagram of fluid
r
x
dx
p
1
p
2
mg
F
f
F
f
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T means ‘total’
(i)
