Problem 2.89
[Difficulty: 2]
Given:
Type of oil, flow rate, and tube geometry
Find:
Whether flow is laminar or turbulent
Solution:
Data on SAE 30 oil SG or density is limited in the Appendix.
We can Google it or use the following
ν
μ
ρ
=
so
ρ
μ
ν
=
At 100
o
C, from Figs. A.2 and A.3
μ
9
10
3
−
×
N s
⋅
m
2
⋅
=
ν
1
10
5
−
×
m
2
s
⋅
=
ρ
9
10
3
−
×
N s
⋅
m
2
⋅
1
1
10
5
−
×
×
s
m
2
⋅
kg m
⋅
s
2
N
⋅
×
=
ρ
900
kg
m
3
=
Hence
SG
ρ
ρ
water
=
ρ
water
1000
kg
m
3
⋅
=
SG
0.9
=
The specific weight is
γ
ρ
g
⋅
=
γ
900
kg
m
3
⋅
9.81
×
m
s
2
⋅
N s
2
⋅
kg m
⋅
×
=
γ
8.829
10
3
×
N
m
3
⋅
=
For pipe flow (Section 26)
Q
π
D
2
⋅
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 Fall '07
 Lear
 Fluid Dynamics, Fluid Mechanics, kg, specific weight, N⋅

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