Problems from White
#1 = P7.3 Hint: this should look familiar
#2 = P7.5 Note: in an accelerating flow, i.e. a favorable pressure gradient,
the boundary layer will be thinner (and more likely to be laminar – hence
with a nice bell mouthed inlet to a pipe, the flow tends to be laminar
regardless of Re number.)
#3 = P7.9 Repeat the flat plate momentum analysis of Sec. 7.2 by replacing
the parabolic profile, Eq. (7.6), with a more accurate sinusoidal profile:
sin
2
u
y
U
π
δ
=
Compute momentumintegral estimates of
*
,
/
,
/
, and
.
f
c
x
x
H
θ
δ
#4 = P7.20 For air at 20
o
C please take
ρ
= 1.2 kg/m
3
and
μ
= 1.8 x 10
5
kg/(ms);
water
ρ
= 998 kg/m
3
. Use Bernoulli equation to determine u at inlet of Pitot tube.
Once you determine u/U then use Table 7.1 to determine
η
and then x.
#5 = P7.26 Let the force on a single plate be F
1
. Please provide the force on
the two configurations of four plates (a and b) in terms of F
1
.
#6 = P7.36 Hint: Re
L
= 1025 (V) 125 / 0.00107 ~ 120,000,000 x V so surely
turbulent!
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 Summer '09
 Rohr
 Fluid Dynamics, Force, Aerodynamics, Drag equation

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