Chapter 8
124
REYNOLDS NUMBER, LAMINAR FLOW, TURBULENT FLOW,
AND ENERGY LOSSES DUE TO FRICTION
125
REYNOLDS NUMBER, LAMINAR FLOW, TURBULENT FLOW,
AND ENERGY LOSSES DUE TO FRICTION
129
8.69 Q = 2.0 ft
3
/s; L = 2500 ft
a) 8-in Schedule 40 steel pipe; D = 0.6651 ft; A = 0.3472 ft
2
b) Cement lined 8–in ductile iron pipe
D = 8.42 in = 0.702 ft; A = 0.3867 ft2; Ch = 140
8.70 Specify a new Schedule 40 steel pipe size. Use Ch = 130
6-in Schedule 40 steel pipe; D = 0.5054 ft
Actual hL for 6-in pipe
8.71 From 8.70
Q = 0.668 ft3/s
REYNOLDS NUMBER, LAMINAR FLOW, TURBULENT FLOW,
AND ENERGY LOSSES DUE TO FRICTION
131
8.73 s
m
98.1
m 0.020
s
m
1022.6
A
Q
VVAQ 2
3
4
8.74
s
ft
2.9
ft
0.181
s 60
min 1
gal 7.48
ft 1
min
gal
507
A
Q
VVAQ 2
3
s
ft 0.4801
s
ft
2.9
DV
8.72 Q = 100 gal/min
1 ft
3
/s/449 gal/min = 0.2227 ft
3
/s
L = 1000 ft; Ch = 130 (New steel)
a) 2-in pipe: D = 2.067 in = 0.1723 ft; A = 0.02333 ft
2
b) 3-in pipe; D = 3.068 in = 0.2557 ft; A = 0.05132 ft2
4
s
Chapter 8
132
8.75 hPPZ
2g
V
P
hhZ
2g
V
P
L212
2
22
LA1
2
11
s
m
4.30
m
10
1.291
s 3600
hr 1
hr
m
200
A
Q
VVAQ 22
3
s
8.76 A.) 5
2
4
R103.61
s
ft
101.58
in 12
ft 1
in 8.5
s 3600
hr 1
mi 1
ft 5,280
hr
mi
55
DV
N
s
s
REYNOLDS NUMBER, LAMINAR FLOW, TURBULENT FLOW,
AND ENERGY LOSSES DUE TO FRICTION
133
8.77
s
ft
55.7
ft 0.006
s 60
min 1
gal 7.48
ft 1
min
gal
150
A
Q
VVAQ
2
3
1
1
111
s
ft
3.41
ft 0.02333
s 60
min 1
gal 7.48
ft 1
min
gal
150
A
Q
VVAQ
2
3
2
2
222
8.78
s
m
4.53
4
025.0
s 3600
hr 1
hr
m
8
A
Q
VVAQ
2
3
1
m
Chapter 8
134
8.79 From PIPE-FLO®;