What percentage of radiation contribution in thermally and hydrodynamically fully developed flow in mixed convection?

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Does anyone have access to these old papers?

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Babak Maghbooli

Fully developed mixed convection in where? inside a pipe, inside firebox or convection section of a fired heater, where? be specific please.

Biplab Das

Mixed convective heat transfer in a channel (vertical )

As a rule of thumb in fired heater design, flue gas temperature is the determining factor. Usually at flue gas temperatures below 1500 to 1800°F (815 to 980°C), radiant heat transfer becomes relatively uneconomical, and building a convection section for gaining more heat from hot gases is advised.