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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
91
0
3
−
×
Ns
⋅
m
2
⋅
=
ν
11
0
5
−
×
m
2
s
⋅
=
ρ
0
3
−
×
⋅
m
2
⋅
1
0
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
γρ
g
⋅
=
γ
900
kg
m
3
⋅
9.81
×
m
s
2
⋅
2
⋅
kg m
⋅
×
=
γ
8.829
10
3
×
N
m
3
⋅
=
For pipe flow (Section 26)
Q
π
D
2
⋅
4
V
⋅
=
so
V
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This note was uploaded on 10/19/2011 for the course EGN 3353C taught by Professor Lear during the Fall '07 term at University of Florida.
 Fall '07
 Lear
 Fluid Mechanics

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