Heat generation during oil compression

[bvuk]

Hi!
How to calculate heat generation during hydraulic oil compression in pipes, e.g., during flow through nozzle or restrictor?

Please help.

 

[MortenA]

The egergy added must be equal the the energy from the pump? Im not an expert on hydraulic systems - but where else could the enrgy come from?

Best regards

Morten

 

[bvuk]

This heat generation is not related to the pump or anything that is a source of energy. It is a simply a local (for flow through restrictor/orifice) transfer from mechanical (kinetic/potential) to thermal energy due to high pressure drop.

I have a theoretical relationship in the form
dT/dP = T a / (Cp rho) where a is a coefficient.

Another source:
HP = (GPM x psi) / 1714. Or KW = (LPM x bar)/ 600 for flow across an orifice.

but I do not know these coefficients and validity range.
A reference to a book or article would be appriciated.

Thank you.

 

[TBP]

Take a look at the "Fluid Power Professionals" forum, located on this board. There's a current thread on this topic.

 

[sailoday28]

The original question related to heat generation.

If the pipe is perfectly insulated, there is no heat transfer to or from the fluid.

As MortenA stated, energy will be added do to pump work.

With regard to heat generation, is the question somehow related to heating affects of flow due to friction?