Nucleate boiling is the normal mode of heat transfer.

Paul Lamar

Ok, Paul I can understand how nucleate boiling would be more efficient
than simple thermal transfer. The heat of vaporization required would
make the transfer more efficient. At least that is what I think is
happening in the reference material you sent.
Bill Jepson

I think that is the mechanism on the micro level. 
This data is on the macro level. This happens to be from Heinz Heisler
book but confirmed by many other references.

Paul Lamar
 
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