Experimental Analysis of Enhanced Heat Transfer and Pressure-Drop of Serrated Finned-Tube Bundles with different Fin Geometries

摘要

Experimental investigations have been carried out for heat transfer and pressure drop at turbulent flow of combustion gases at transverse serrated finned-tubes in cross-flow. I- and U-shaped fin geometries were considered, where the geometrical constants for the fins, i.e. height, fin pitch, fin thickness, and fin width were varied. For the design of heat exchangers with transverse finned tubes in cross-flow, it is necessary to consider the advantage and disadvantage of geometrical factors, which influence heat transfer and pressure drop. By means of experimental results and equations from literature the correlations for the Nusselt number Nu and pressure drop coefficient ξ were developed and compared. Additionally, a performance evaluation criterion was carried out for the two different fin geometries.