critical Reynolds number
 

what is the criticl Reynolds number when water flows through pipe? what is the critical Reynolds number when air flows through pipe? thanks

Re: critical Reynolds number
 

The critical Re for pipe flow is usually taken as ~ 2300, assuming you are referring to transition to turbulence. This Re is based on pipe diameter and does not depend on the type of fluid.

Re: critical Reynolds number
 

thanks for ur reply but Reynolds number = ud/kienmatic viscosity.. so Re depends on kinematic viscosity also..... this is my doubt..

Re: critical Reynolds number
 

Yes, it does - so use the correct kinematic viscosity for the appropriate fluid. The critical Re is still ~2300.

Re: critical Reynolds number
 

thank u......