How Do You Calculate Reynolds Number for Water Flow in Pipes?

[jim1174]

Homework Statement

Substance water
Temperature 60 degrees c
Density 983kg
Pipe size 10"
Flow rate 10 m/s
Abs viscosity 432 centipoise

Homework Equations

The Attempt at a Solution

(Velocity of fluid or flow rate ) (diameter of pipe) divided by (viscosity of fluid)

(10)(10)(983) divided by (432) = 227.546

 

[SteamKing]

The Reynolds No. is non dimensional. Is your calculation of Reynolds No. non-dimensional? What kind of viscosity is used to calculate Reynolds No.? Have you used the correct viscosity?

 

[jim1174]

This is all that was on the assignment

Refer to the Reynolds Number Equation and answer the following questions:
1. Which is more turbulent – Fluid A or Fluid B? Explain your answer?

Fluid a
Substance water
Temperature 60 degrees c
Density 983 kg
Pipe size 10"
Flow rate 10
Abs viscosity 432 centipoise

(10)(10)(983) divided by(432) = 227.546

Fluid b
Substance crude oil
Temp 60 degrees
Density 915kg
Pipe size 10"
Flow rate 10 m/s
Abs viscosity 450 centipoise
(10)(10)(915) divided by 450 = 203.333

 

[AlephZero]

You are mixing up different units here. If you are working in SI, the pipe size (diameter?) and viscosity given in the question are not in SI units.

 

[SteamKing]

Like AlephZero stated, you must check these things out. Not all your problems will be simple plug-and-chug calculations. You must think about what the formulas mean and always pay attention to using the proper units.