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???

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,

I think he's asking what the transition Re's are for a compressible flow. Is there a difference?

yes, I need the transitional reynolds number for compressible flow......

thanx phil for ur reply...

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.