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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
THE INFLUENCE OF DELTA WINGLET VORTEX GENERATOR POSITION AND ROLL ANGLE ON FIN-AND-ELLIPTICAL TUBE HEAT EXCHANGER PERFORMANCE
Submission Author:
Tatiana Silva Ferreira , DF , Brazil
Co-Authors:
Tatiana Silva Ferreira, Jurandir Itizo Yanagihara
Presenter: Tatiana Silva Ferreira
doi://10.26678/ABCM.ENCIT2020.CIT20-0456
Abstract
The analysis of new configurations for compact heat exchangers is important to improve their overall efficiency. This research objective is to numerically evaluate heat transfer and pressure drop in two rows of a fin-and-oval tube heat exchanger with delta winglet longitudinal vortex generators (LVGs). Oval tubes are still considered a non-conventional geometry and there are relatively few heat transfer enhancement studies connected to LVGs. Particularly, this is the first work to consider the influence of the roll angle on heat transfer enhancement in this kind of geometry. The flow analysis is performed using a commercial computational fluid dynamics software, based on the finite volume method. The Reynolds number is 1000, based on the hydraulic diameter, for a turbulent, incompressible, constant property, steady-state flow. The influence of different vortex generator positions and roll angles on heat transfer and pressure drop is analyzed. A performance evaluation criterion is used to select the best combination of the LGV geometric parameters. A thorough phenomenological analysis is also performed to clarify the heat transfer enhancement mechanism.
Keywords
Heat transfer, Heat exchanger, Elliptical tube, Thermal-hydraulic performance, pressure drop
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