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Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 1.4

ISSN Print: 1940-2503
ISSN Online: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2017015791
pages 93-107

NUMERICAL INVESTIGATION OF HEAT TRANSFER ENHANCEMENT USING DETACHED VORTEX GENERATORS IN FIN-AND-TUBE HEAT EXCHANGERS

Shubham Agarwal
Birla Institute of Technology, Mesra, Ranchi, Department of Mechanical Engineering, Birla Institute of Technology, Mesra, Ranchi - 835215
R. P. Sharma
Birla Institute of Technology, Mesra, Ranchi, Department of Mechanical Engineering, Birla Institute of Technology, Mesra, Ranchi - 835215

ABSTRACT

The current study deals with the investigation of heat transfer and fluid flow properties from plain fin-and-tube heat exchangers installed with detached rectangular winglet pairs (DRWPs). A 3D numerical study is conducted to analyze the effect of DRWPs on the performance of the heat exchangers and to compare the performance of heat exchangers in DRWP enhanced cases with baseline configuration. The study includes optimization of detached vortex generator (DVG) geometry for maximum heat transfer enhancement. The DRWPs were installed in three different configurations: 1DRWP (first tube), 3DRWP (alternate tube), and 7DRWP (all tubes). Compared to the vortex generators attached to the fin, significantly higher heat transfer enhancement is observed with DRWPs. Enhancement in overall heat transfer coefficient of 18.2-61.9%, 33.1-80%, and 52.4-97.6% over baseline is observed in three different configurations with DVGs, investigated over the range of Reynolds number under consideration. Corresponding increase in j–factor of 62%, 80%, and 98% is observed at Re = 675 in the three configurations. The analysis of the heat transfer mechanism, and the reasons behind the significant heat transfer rise, confirms the feasibility of application of DRWPs in heat transfer enhancement and lays down the means to install these DVGs effectively on the heat exchanger and in other environments.


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