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I'm working on a heat transfer problem with a gas stream in a tiny tube. At my dimensions and flow rates, the flow still has a parabolic velocity profile. The mean radial velocity of the gas is zero, and I've treated the radial aspect of the heat transfer as strictly diffusion.

My question is this:

Given that the gas velocity is decreasing, from inside to out, is the radial component of the diffusion rate now dependent upon the changing velocities the heat must transition through? If so, does anyone have some equations or online references to aid me in understanding this?

Thanks and happy holidays :)

Mike

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# Aerospace Anisotropic heat diffusion in gas streams with shear?

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