Homework Answers
Part a
For 8" Schedule 80 pipe
Outside dia Do = 8.625 inch
Outside radius Ro = Do/2 = 8.625/2 = 4.3125 inch
Thickness t = 0.500 inch
Inside Radius Ri = Ro - t
= 4.3125 - 0.500
= 3.8125 inch
Inside dia Di = 2*Ri = 2*3.8125 = 7.625 inch
Part b
Roughness of commercial steel pipe
e = 0.045 mm
For 6" Schedule 40 pipe
Outside dia Do = 6.625 inch
Outside radius Ro = Do/2 = 6.625/2 = 3.3125 inch
Thickness t = 0.280 inch
Inside Radius Ri = Ro - t
= 3.3125 - 0.280
= 3.0325 inch
Inside dia Di = 2*Ri = 2*3.0325 = 6.065 inch x (25.4mm/inch)
=154.051 mm
Roughness ratio = e/Di
= (0.045 mm) / (154.051 mm)
= 0.0002921
Part c
Reynolds number Re = 600,000
Roughness ratio = e/Di = 0.005
From Moody's chart at given conditions
Re is represented by point C
e/Di is represented by point B
Intersection point is A
Fanning friction factor is represented by point D
Fanning friction factor f = 0.0305
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Use the moody
diagram provided. You have riveted circular steel pipe that is
1.5ft in diameter. The roughness is ε=0.003ft. Water at
T=60oF flowing through the pipe.
What is the relative roughness, ε/D, of the
pipe?
What is the kinematic viscosity of the water in
ft2/s?
What is the velocity for the Reynold’s number to be
Re=1000? Ans 0.00811ft/s
What is the velocity needed for the Reynold’s number to
be Re=30,000? Ans 0.243ft/s
What is the velocity for the Reynold’s...
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solve using paython
In fluid flow problems, the flow velocity in a long horizontal pipe depends on the pipe material, pipe geometry and fluid properties in addition to the pump power. For a horizontal pipe with a pump, the friction factor can be obtained from many correlations such as Colebrook-White Equation: 1.1998 5.0452 (6) log Re 28257 -)} (1) 3.7065 7--2 log +58506 (Re)-0.3981 In which, f is the friction factor and is the roughness ratio given by: given by:...
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