Pancake spiral coil in a vessel

[sheiko]

Hello,

I need to calculate external heat transfer coefficient outside a horizontal pancake spiral coil placed in a vertical vesssel (a glycol dehydrator).

In addition to the correlation Nu = f(Re, Pr), i need to know:
1/ How to determine equivalent diameter outside the coil
2/ How to calculate the velocity through the coil

Could you please help me?

Any reference (book, article) will be more than welcomed.

Regards

"We don't believe things because they are true, things are true because we believe them."

 

[srfish]

Hey Sheiko,

How about the old standby, "Process Heat Transfer" by Kern on page 721.

 

[sheiko]

Thanks but i have already checked it and there is nothing about " equivalent diameter" and "velocity". Even the Nusselt correlation seems not correct.

"We don't believe things because they are true, things are true because we believe them."

 

[sheiko]

Any advice?

"We don't believe things because they are true, things are true because we believe them."

 

[IRstuff]

I don't understand most of your question. Velocity is a function of your pump or coolant source, what is there to calculate? Diameter of what? Your coil, your diameter; what is there to calculate?

TTFN

FAQ731-376