OK, I've been stuck on this problem for like 3 hours now and it's driving me insane. I'm given a duct with air entering at a given temperature. The duct walls are at a different, higher constant temperature. I need to solve for the heat flow through the walls as well as the mean exit temp of the air. I've shown that the flow is turbulent.
I'm mostly sure that I need to find an average Nusselt number for the whole pipe to be able to solve for the heat transfer coefficient so that I can solve for the total heat transfer in the pipe. Unfortunately, nowhere in my book nor in any other source I've found does it list an average Nu equation for turbulent forced convection. Anyone out there happen to be able to point me in the right direction for finding one, or, even better, a more straightforward way of tackling this problem?
I'm mostly sure that I need to find an average Nusselt number for the whole pipe to be able to solve for the heat transfer coefficient so that I can solve for the total heat transfer in the pipe. Unfortunately, nowhere in my book nor in any other source I've found does it list an average Nu equation for turbulent forced convection. Anyone out there happen to be able to point me in the right direction for finding one, or, even better, a more straightforward way of tackling this problem?
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