Journal
APPLIED THERMAL ENGINEERING
Volume 73, Issue 1, Pages 681-690Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2014.08.019
Keywords
CFD; Heat exchanger; Boiler; Finned tube; Segmented fin; Serrated fin; Heat transfer
Funding
- Enterprise Ireland [IP/2008/0521]
- Synergen, Dublin Bay Power Plant, Ireland
- Byrne O Cleirigh Consulting, Dublin, Ireland
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A Computational Fluid Dynamics (CFD) model capable of predicting heat-transfer and pressure-drop performance of finned-tube bundles in cross flow is presented. Three helically-wound fin geometries are investigated: solid (continuous); partially-serrated; and fully-serrated. A steady-state approach, with a two-equation turbulence model, is employed to examine Reynolds numbers in the range of 5000-30,000. The external Nusselt number and overall pressure drop predicted by the CFD model are compared with those predicted by published empirical correlations. The CFD results fall within the range of values predicted by the empirical correlations. The CFD results show that the Nusselt number increases by up to 23% between the partially- and fully-serrated fins; this sensitivity to serration geometry is not captured in any currently published empirical correlations. (C) 2014 Elsevier Ltd. All rights reserved.
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