Here are a couple more suggestions:
Handbook of Applied Thermal Design, edited by Guyer
Taylor & Francis publishing
The old and the new versions of the book are the same (I've heard), which means the material is relatively old, but the correlations are probably as good as they get. Look in Chapter 1.
Design and Analysis of Heat Sinks, by Kraus & Bar-Cohen
J. Wiley
The most useful stuff is in Chapter 10, I think. There is a section on optimum fin spacing in natural convection that I've used a lot. There is a lot of material on analyzing reindeer-antler-style shapes which I have never gotten into. For most complicated shapes, I tend to go right to conjugate CFD instead of trying to re-learn matrix inversion.
Also consider the material in the classic reference by Kays, "Compact Heat Exchangers" (sorry, I don't own a copy of that one) Again, this book is quite old, but no sense reinventing the wheel.
Finally, my old standby heat transfer textbook has some pretty good basics: Heat and Mass Transfer, Frank M. White
Addison-Wesley
There is also a lot of reference material on this subject on
and
I hope you are also considering the pressure drop of the extended surfaces -- I have seen way too many claims of much-enhanced heat transfer, only to find that the pressure drop is also enhanced, with the result that there is insufficient air moving through the fin area. But maybe you're not planning to use air??
Cathy Biber
Biber Thermal Design
