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Characteristics of Flow Symmetry and Heat Transfer of Winglet Pair in Common Flow Down Configuration

School of Mechanical Engineering, Key Laboratory of Railway Vehicle Thermal Engineering of MOE, Lanzhou Jiaotong University; Lanzhou 730070, China
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Symmetry 2020, 12(2), 209; https://doi.org/10.3390/sym12020209
Received: 31 December 2019 / Revised: 14 January 2020 / Accepted: 16 January 2020 / Published: 2 February 2020
(This article belongs to the Special Issue Symmetry in Fluid Flow)
The effect of transverse pitch between a pair of delta-winglet vortex generators arranged in a common flow down configuration on the symmetrical flow structure and heat-transfer performance was numerically investigated. The results showed that symmetrical longitudinal vortices form a common flow down region between the vortices. The fluid is induced to flow from the top towards the bottom of the channel in the common flow region, which is advantageous to the heat transfer of the bottom fin. The vortex interaction increases and the vortex intensity decreases along with the decrease in transverse pitch of vortex generators. Vortex interaction has a slight influence on pressure penalty. The Nusselt number decreases with increasing vortex interaction. The vortices gradually attenuate and depart from each other during the process of flowing downward. A reasonable transverse pitch of delta-winglet vortex generators in a common-flow-down configuration is recommended for high thermal performance. View Full-Text
Keywords: flow symmetry; common flow down; vortex interaction; vortex intensity; heat transfer flow symmetry; common flow down; vortex interaction; vortex intensity; heat transfer
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Song, K.; Shi, W.; Wu, X.; Wang, L. Characteristics of Flow Symmetry and Heat Transfer of Winglet Pair in Common Flow Down Configuration. Symmetry 2020, 12, 209.

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