5 replies to this topic

[man2k]

please enlighten on
As in a pipe flow when the exit pressure decreases, at critical prssure ratio, choking takes place & velocity do not increase further wih decrease in downstream pressure then howcome it is possibe to achieve supersonic flow in a pipeline, & what are the practical applications.
thanks in advance

[fallah]

In these cases we have "chocked flow" and the mass flowrate tends to be decreased.

Regards

[man2k]

please enlighten on
As in a pipe flow when the exit pressure decreases, at critical prssure ratio, choking takes place & velocity do not increase further wih decrease in downstream pressure then howcome it is possibe to achieve supersonic flow in a pipeline, & what are the practical applications.
thanks in advance

thanks fallah,for ur reply.
but ......., i want to be bit clear.
actually i want to know how a supersonic flow of fluid can be achieved in a pipe flow.

[JoeWong]

man2k,
Please read this article.

http://en.wikipedia....De_Laval_nozzle

Hope it give you some idea how supersonic can be created in a special device.

One of the applications of supersonic is in rocket

[Art Montemayor]

I think the specific question has to do with gas flow at supersonic velocity INSIDE OF A PIPE - not in a DeLaval nozzle or through an orifice.

I believe the PowerPoint presentation done by the University of Texas centers on this important criteria at:

http://utwired.engr....4/mom/comp3.ppt

I like this presentation because it describes in detail what is actually happening in compressible flow - practically, and what can happen theoretically.

[s h z]

It is not possible to achive supersonic flow in pipes. To achive supersonic flow you must pass the fluid through converging-diverging nozzle or "DeLaval nozzle" as mentioned above by "Art Montemayor".

To achive supersonic velocity, fluid must be compressible.

Man2k,
I hope you would able to find your answer easily in lite of above mentioned points.