Add nucleate boiling correlations

https://en.wikipedia.org/wiki/Nucleate_boiling#Boiling_heat_transfer_correlations

The coolant-side model we currently use assumes free convection, which is not true in a lot of cases where the wall temperature is above the boiling point of the coolant. There are some correlations to roughly model nucleate boiling, given in the Wikipedia article above.

Start with the linked Wikipedia article and inspect the current coolant-side model that assumes free convection. Determine how nucleate-boiling correlations should be selected and integrated when the wall temperature exceeds the coolant boiling point. Done means the model represents those cases and has coverage demonstrating the updated behavior.

Written by the indexing model from the issue text.