What are the Nusselt number(Nu) correlations for natural convection of gas through vertical hollow cylinder with transient flow?

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Ghassan Fadhil Smaisim Popular answer

Dear Umesh,

I advise you to read the book of Derek Ingham which titled convective heat transfer and you will find a nice formulation about many cases.

Good Luck

Ghassan Fadhil Smaisim

Zainab Majeed Sharba

Thank you Dr Ghassan, so useful book.

Hamit Can

http://heattransfer.asmedigitalcollection.asme.org/article.aspx?articleid=2603139

https://www.quora.com/unanswered/What-are-the-Nusselt-number-Nu-correlations-for-the-natural-convection-of-gas-through-a-vertical-hollow-cylinder-with-transient-flow-through-a-cylinder