Fix HTC transition range blending

[kyriv-lab]

This PR resolves issue #33357

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[kyriv-lab]

@GiudGiud please review.

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• chemical_reactions
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• fluid_properties
• fsi
• functional_expansion_tools
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• heat_transfer
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This comment will be updated on new commits.

[GiudGiud]

that's a good catch
@tanoret for technical review the changes in results are significant

Should we be blending Nu for all these correlations?

The correlations don't mention blending

[GiudGiud]

Seems the range in Pe number in Borishanskii is intended to cover laminar and turbulent regime. So we should not be blending that one.
What do we do now?

[kyriv-lab]

Pe: Re * Pr. And Borishanskii has a valid formula for Pe <=200. Pr for sodium is very low: about 0.004 to 0.006. So that means that the Re number for this region can still be turbulent.

Todreas & Kazimi present their heat-transfer correlations in the chapter HEAT TRANSFER CORRELATIONS IN TURBULENT FLOW.

So I don't think this is an issue.

Additionally in the original paper the Re number is in the turbulent regime:

[GiudGiud]

Where did blending Nu come from ? T&K?

[GiudGiud]

Let's consider Gnielinski that is essentially defined in the transition range (down to Re > 2300). Do we adapt our info.ReT to avoid blending it?

[kyriv-lab]

Where did blending Nu come from ? T&K?
@tanoret implemented the blending Nu idea.