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Stack of steel billets is placed in a cooling chamber. All billets of the same row are touching each other and each row is spaced of 5 in. I want to calculate the convection coefficient and pressure drop across the bundle. Ultimately, I would like to calculate the heat transfer after 1 hour (billets temperature and heat loss)

Billets T = 1100 F

Air, v = 60 ft/s, T = 70 F

T = 1100 F ______________

OOOOOOOOOOO <--

OOOOOOOOOOO

OOOOOOOOOOO <-- Air, v = 60 ft/s, T = 70 F

OOOOOOOOOOO

OOOOOOOOOOO <--

____________________________

What I am thinking of is to calculate an average h because air velocity is very high between the billets but a stagnant zone will exist near the hollow of adjacent billets.

I don't know the governing equations and how to start this problem.

Thank you if you can help.

HR