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Old   October 31, 2007, 07:21
Default compressible flow
  #1
Naveen Kumar
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In a pipe flow..for an incompressible fluid the Reynolds number for transition from laminar is 2300 and is turbulent for 4000.

How the number changes for compressible fluid flow???
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Old   October 31, 2007, 08:17
Default Re: compressible flow
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phil
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Naveen,

the passage from incompressible to compressible is around Ma=0.1 (0.2).

The nature of a flow (incompressible or compressible) is not based on the Reynolds Number but on the Mach number.

It's possible to define for a fluid and a specific pipe the Re but you can't define it for all the fluid and pipe.

regards,
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Old   October 31, 2007, 16:40
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otd
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I think he's asking what the transition Re's are for a compressible flow. Is there a difference?
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Old   November 2, 2007, 01:39
Default Re: compressible flow
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naveen
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yes, I need the transitional reynolds number for compressible flow......

thanx phil for ur reply...
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Old   November 2, 2007, 05:53
Default Re: compressible flow
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scrijnczw
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I think the numbers are also valid for compressible flow in a pipe. The only thing that matters is that the flow condition cannot be judge only from its velocity as in newtonian-incompressible case (at particular ambient temperature and pressure) where viscosity and characteristic length are merely constants.
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