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Compressible Flow Equation

Compressible Flow Equation

Compressible Flow Equation

(OP)
Anyone know the derivation of Equation 1-11 in Crane's Tech Paper 410?

To use this formula you have to calculate Y per page A-2.

RE: Compressible Flow Equation

I BELIEVE IT HAS BEEN EXPLAINED WELL. Specify your problem I give YOU THE  solution.

RE: Compressible Flow Equation

the theoretical basis involves integrating bernoulli's equation, under the condition isentropic expansion / compression. It can also be extended to irreversible expansions, under isentahalpic conditions, and to simple friction loss in the present of heat gain (as i recall). this is all text book stuff...

RE: Compressible Flow Equation

(OP)
I cannot seem to correlate the Crane 410 equation with my compressible flow textbook.  So if anyone can direct me to the dirivation then I would appreciate if you would drop me a note at Lannie_McNeill@willbros.com.

Thanks.

RE: Compressible Flow Equation

1969grad, "Y" in the listed formula is the net expansion factor for compressible flow (gases) through orifices, nozzles or pipe. This is a correction factor needed to compensate for the changes in fluid properties due to expansion of the fluid. This equation was developed by a Frenchman by the name of Darcy and is based on extensive empirical data. I believe it was developed sometime in the latter half of the 19th century.

As for comparison with your text book, the text may be using a different equation, but it should have the fluid expansion taken into account somehow (that is, if it is for compressible fluids). It may have a different nomenclature for it.

Hope this helps.
saxon

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