I am currently studying on flat heat exchangers with various fins shapes for my research. The objective is to identify the best fin shape. Colburn factor and friction factor are to be calculated.
Please look at this interesting Book it can help you.Good luck
Introduction to Heat Transfer, Sixth Edition
Theodore L. Bergman, Adrienne S. Lavine, David P. DeWitt, Frank P. Incropera
http://bookzz.org/book/1181859/cee99a
Hi Sir Abdul Aziz Jaafar,
The comparison is made for straight pipe and as for the velocity range is 1.8 to 3 m/s. In range of Reynolds number. Air-side heat exchanger study.
Better to refer to Heat Transfer Data book for specific correlations. Else one can use the regular closed form solutions available in terms of Bessel's function for unconventional geometries to estimate the fin efficiency. I would also suggest a CFD analysis. Your task can be completed both numerically or analytically.
You can decide it after you know the dimension of your exchanger, in particullar it's surface area
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