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## Main Question or Discussion Point

Hi guys,

I'm doing some research in papers and literature to solve this problem but I've not found anything useful. I want to know the air velocity inside a pipe by the only effect of natural convection. I've attached a picture of the system right here:

I hope you can help me to find the equation that let me know the velocity in this system.

Thanks in advance,

Salus

I'm doing some research in papers and literature to solve this problem but I've not found anything useful. I want to know the air velocity inside a pipe by the only effect of natural convection. I've attached a picture of the system right here:

I hope you can help me to find the equation that let me know the velocity in this system.

Thanks in advance,

Salus