A new method of enhancing heat transfer in sudden expansion channel using vortex generators with toe-out and toe-in configurations by acquiring perquisites of recirculation and secondary vortex flow

The relative positions of leading edges and trailing edges of rectangular vortex generators (VG) in the winglet form play a crucial role in modifying thermal and hydraulic boundary layers thereby affecting the heat transfer augmentation and pressure drop in a sudden expansion channel having expansio...

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Bibliographic Details
Published in:Journal of mechanical science and technology 2019, 33(8), , pp.3913-3925
Main Authors: Ramanathan, S., Thansekhar, M. R., Kanna, P. Rajesh, Gunnasegaran, Prem
Format: Article
Language:English
Subjects:
Angle of attack
Computational fluid dynamics
Configurations
Control
Dynamical Systems
Engineering
Finite volume method
Fluid flow
Heat transfer
Industrial and Production Engineering
Laminar flow
Leading edges
Mechanical Engineering
Pressure drop
Reynolds number
Thermal boundary layer
Three dimensional flow
Vibration
Vortex generators
Vortices
Winglets
기계공학
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Summary:The relative positions of leading edges and trailing edges of rectangular vortex generators (VG) in the winglet form play a crucial role in modifying thermal and hydraulic boundary layers thereby affecting the heat transfer augmentation and pressure drop in a sudden expansion channel having expansion ratio (ER) 2:1. A numerical simulation was carried out for solving the momentum and energy equations of a three dimensional vortex- laminar flow (Reynolds number < 190) with a finite volume method based commercial code FLUENT 16.2. Reynolds number, angle of attack and VG configuration have been considered as influential parameters affecting the thermo-hydraulic performance of the sudden expansion channel due to the combined effect of primary recirculation and secondary vortex flow. The heat transfer enhancement along with corresponding pressure drop penalty was compared for the toe-out and toe-in configurations at various Reynolds (Re) numbers and angle of attacks (β). Eventually irrespective of configurations, rectangular winglet VGs are found to have better overall performance at β = 30° and β = 45° in both toe-out and toe-in configurations due to strong secondary vortex flow.
ISSN:1738-494X
1976-3824
DOI:10.1007/s12206-019-0736-9