What would be the characyeristics length in Nusselt number calculations?

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Saad El-Sayed

I think the length of the packed bed in the direction of boundary layer growth.

Somen Mondal

thank sir for your kind reply.

But, one thing sir we generally consider hydraulic diameter for the flow through non circular empty channel. In case of packed channel, is it be the same? Can you please recommend me any reference in favor of that for me.

previous researchers use length as I told you before or can use V/S ratio not a hydraulic diameter