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Hot air flow in pipe

Hot air flow in pipe

Hot air flow in pipe

(OP)
The problem that I am working on is to figure out the characteristics of flow in a pipe.
Air: 1500F, 200lb/min,100psi.

I have solved for velocity when given a pipe diameter of 4". I have solved for reynolds no.
I have a velocity of about 1200ft/s. Reynolds no = 2650265. So no matter what the flow will be turbulent with a realistic pipe size...

Can someone verify my numbers? Do I need to approach this differently due to hot air temp and higher pressure?

RE: Hot air flow in pipe

what is this? A jet engine? The velocities and temperatures are way above what you normally see and hence this may be outside of the envelope which is normally seen in "pipes".

At a velocity of 1200 ft/sec in a 4" pipe, but only 100 psi, your pipe won't be very long. Exit losses and how the gas exits the pipe will have a significant effect on pressure and flow characteristics. Maybe try a similar question in the aeronautical section?

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

RE: Hot air flow in pipe

That's faster than sonic.

I hate Windowz 8!!!!

RE: Hot air flow in pipe

(OP)
The idea is that this is a test stand for smaller turbines/turbochargers. Air being heated by a burner or resistance heater and blown through the pipe and into a housing containing turbine wheel to simulate engine exhaust.

I see that the flow is more than sonic but there's no diverging nozzle until the inlet of the turbine housing.

What kind of effects or things to solve for in this system?

RE: Hot air flow in pipe

Sorry. Over my head.

I hate Windowz 8!!!!

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