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

Flow Symmetry and Heat Transfer Characteristics of Winglet Vortex Generators Arranged in Common Flow up Configuration

School of Mechanical Engineering, Key Laboratory of Railway Vehicle Thermal Engineering of Ministry of Education of China, Lanzhou Jiaotong University; Lanzhou 730070, China
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Symmetry 2020, 12(2), 247; https://doi.org/10.3390/sym12020247
Received: 31 December 2019 / Revised: 2 February 2020 / Accepted: 4 February 2020 / Published: 5 February 2020
(This article belongs to the Special Issue Symmetry in Fluid Flow)
The generation of longitudinal vortices is an effective method for promoting thermal performance with a relative low-pressure penalty in heat exchangers. The winglet pair can generate symmetrical longitudinal vortices on the cross-section of the channel. The heat transfer and pressure-loss characteristics of a pair of winglet vortex generators with different transverse pitches are numerically studied in this paper. The winglet pair arranged in a common flow up configuration generates a pair of symmetrical longitudinal main vortices with counter-rotating directions. The symmetrical flow structure induces fluid to flow from the bottom towards the top of the channel in the common flow region between the longitudinal vortices. The flow symmetry of the longitudinal vortices and the heat transfer performance are strongly affected by the transverse pitch of the winglet pair owing to the interaction between the longitudinal vortices. The optimal transverse pitch of the studied winglet pair with the best thermal performance is reported. The increments in the vortex intensity and the Nusselt number for the optimal pitch are increased by up to 21.4% and 29.2%, respectively.
Keywords: winglet pair; common flow up; vortex interaction; flow symmetry; thermal performance winglet pair; common flow up; vortex interaction; flow symmetry; thermal performance
MDPI and ACS Style

Song, K.; Wang, L.; Hu, Y.; Liu, Q. Flow Symmetry and Heat Transfer Characteristics of Winglet Vortex Generators Arranged in Common Flow up Configuration. Symmetry 2020, 12, 247.

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