Enhancement of heat transfer using delta-winglet type vortex generators with a common-flow-up arrangement

Pal, A and Bandyopadhyay, D and Biswas, G and Eswaran, Vinayak (2012) Enhancement of heat transfer using delta-winglet type vortex generators with a common-flow-up arrangement. Numerical Heat Transfer, Part A Applications, 61 (12). ISSN 1040-7782

Full text not available from this repository. (Request a copy)


Simulations of a coolant air flowing in a heat exchanger with delta-winglet type vortex generators in common-flow-up configuration have been performed to unveil the salient heat transfer characteristics. The heat exchanger is approximated as a periodic rectangular channel with heated walls and a pair of built-in tubes near the inlet and outlet. The heat transfer characteristics of the heat exchangers with vortex generators near the inlet, outlet, and both inlet and outlet have been compared. The Navier-Stokes equations together with the energy equation are solved employing unstructured finite volume method. The simulations reveal a significant enhancement in heat transfer because of the strong swirling motion originating from the streamwise longitudinal vortices behind the pair of delta winglets. The spiraling flow entrains air into the core and causes intermixing of the fluid layers to disrupt the growth of the thermal boundary layer. A parametric study on the angles of attack identifies the conditions under which enhancement in heat transfer can lead to significant miniaturization of the heat exchangers. The analysis also reveals interesting flow structures behind the winglets and correlates them to the mechanism of heat transfer

[error in script]
IITH Creators:
IITH CreatorsORCiD
Eswaran, VinayakUNSPECIFIED
Item Type: Article
Uncontrolled Keywords: Angles of attack; Energy equation; Enhancement of heat transfer; Fluid layer; Heat transfer characteristics; Heated wall; Longitudinal vortices; Parametric study; Rectangular channel; Strong swirling; Thermal boundary layer; Vortex generators
Subjects: Physics > Mechanical and aerospace
Divisions: Department of Mechanical & Aerospace Engineering
Depositing User: Team Library
Date Deposited: 13 Nov 2014 09:14
Last Modified: 30 Aug 2017 10:51
URI: http://raiith.iith.ac.in/id/eprint/756
Publisher URL: https://doi.org/10.1080/10407782.2012.677322
OA policy: http://www.sherpa.ac.uk/romeo/issn/1040-7782/
Related URLs:

Actions (login required)

View Item View Item
Statistics for RAIITH ePrint 756 Statistics for this ePrint Item