Common data g = 9.81 m/s². The standard properties of water are density: ϱH2O=1kg/dm3ϱH2O=1kg/dm3 exactly, kinematic...

Common data

g = 9.81 m/s².
The standard properties of water are density: ϱH2O=1kg/dm3ϱH2O=1kg/dm3 exactly, kinematic viscosity: νH2O=1.02⋅10−6m2/sνH2O=1.02⋅10−6m2/s.

Lubrication oil is pumped at a rate of 30.5 cm³/s through a 13 m long D = 7.5 mm diameter pipe on a steam engine. The pipe roughness is ε = 1.5 µm. The density of the lubricating oil is 960 kg/m³, its dynamic viscosity at 25 °C is 4 Pa·s.

Do not forget to tick the appropriate units!

What is the weight flow rate of the lubricating oil?
What is the momentum flow rate in the pipe?
What is the Reynolds number?
What is the head loss along the pipe?
What is the pressure drop along the pipe?
Calculate the power the oil pump needs to deliver.
As the temperature rises to 95 °C, the dynamic viscosity drops by a factor of 100. How does this change the flow type and the required power?
The new Reynolds number will be:
The power of the pump becomes:

Solutions

Expert Solution

Ally Wells answered 4 months ago

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