Numerical Analysis of Fin Side Turbulent Flow for Round and Flat Tube Heat Exchangers
Journal Title: International Journal of Modern Engineering Research (IJMER) - Year 2014, Vol 4, Issue 7
Abstract
Numerical three dimensional simulation of turbulent flow in round and flat tube fin heat exchangers having two rows of staggered arrangement has been carried out to investigate fluid flow and heat transfer characteristics using ANSYS Fluent 14® software. HYPERMESH10® Software has been used for the creation of models as well for meshing. The cases have been simulated for different fin side Reynolds number in turbulent regime to observe the effect of various parameters like fin pitch, tube pitch and fin temperature on Colburn j factor and Friction factor f for both round and flat tubes. Fin side flow has been simulated using various steady flow models in the software for same velocity range. As simulation using k-ε model resulted in close agreement with that of experimental in turbulent regime, it is considered for further analysis. The performance of round tubes is compared with that of flat tubes with same flow area and geometrical parameters. For both round and flat tube domains with all the geometrical configurations simulated in this work Colburn j factor varied inversely with the inlet air velocity. The heat transfer is more with the higher fin spacing for both round and flat tubes following the above said trend. On the other hand, the pressure drop across the tubes is more with the lesser fin spacing in contrast to the heat transfer. Due to lesser turbulent intensity in flat tubes, they exhibit slightly lesser Colburn j factor and considerably lesser pressure drop compared to round tubes. Although flat tubes exhibit slightly lesser Colburn j factor, due to larger exposed tube area increase in the air temperature in the fin side is comparable with that of round tubes. Higher fin temperatures result with lesser Colburn j factor and higher pressure drop across the tubes although the fin temperature affects the pressure drop to lesser extent.
Authors and Affiliations
Mallikarjuna , Dr. V Seshadri , Vijaya Raghu B
Keywords
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