Open AccessNumerical study of heat transfer enhancement by rectangular winglet vortex generator pair in a channel
Author(s) -
Qiang Zhang,
Liang-Bi Wang
Publication year - 2016
Publication title -
advances in mechanical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.318
H-Index - 40
eISSN - 1687-8140
pISSN - 1687-8132
DOI - 10.1177/1687814016648244
Subject(s) - vortex generator , wingtip device , reynolds number , heat transfer , mechanics , heat transfer enhancement , laminar flow , vortex , materials science , hydraulic diameter , angle of attack , pressure drop , geometry , heat transfer coefficient , physics , turbulence , mathematics , aerodynamics
A numerical simulation was performed to investigate the effects of longitudinal vortices on the heat transfer enhancement of a laminar flow in a rectangle duct mounted with rectangular winglet pair on the bottom wall. The studied Reynolds number which was defined using the hydraulic diameter twice the channel height ranges from 500 to 7000. The comparisons of the fluid flow and heat transfer characteristics for the cases with and without rectangular winglet pair were carried out. The effects of the height and attack angle of vortex generator pair on the heat transfer performance were investigated. The results show that mounting rectangular winglet pair on the bottom wall of the channel can significantly enhance heat transfer. The distributions of secondary flow on the cross sections are consistent with the distributions of Nu and J for different attack angles. The maximum heat transfer performance is obtained when the attack angle is 29° due to the maximum value of secondary flow generated by rectangular winglet pair
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