The primary goal of this educational paper is to construct, for the first time, compact and reliable correlation equations for the asymptotic friction factor and the asymptotic Nusselt numbers for internal, longitudinal finned tubes as a function of the number of fins, the relative fin height and the laminar Reynolds number. Neither textbooks nor the thermofluid dynamics literature provides this information which is extremely useful to instructors of courses on heat transfer to elucidate passive augmentation techniques using fins. The resulting correlation equations for f and NuD have been tested in classroom environments with a great amount of success.
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