Flow and heat transfer of parallel multiple jets obliquely impinging on a flat surface

Li, Y, Li, B, Qi, F and Cheung, S 2018, 'Flow and heat transfer of parallel multiple jets obliquely impinging on a flat surface', Applied Thermal Engineering, vol. 133, pp. 588-603.


Document type: Journal Article
Collection: Journal Articles

Title Flow and heat transfer of parallel multiple jets obliquely impinging on a flat surface
Author(s) Li, Y
Li, B
Qi, F
Cheung, S
Year 2018
Journal name Applied Thermal Engineering
Volume number 133
Start page 588
End page 603
Total pages 16
Publisher Elsevier
Abstract The integrated flow fields of multiple interacting jets and oblique impinging flow have been investigated. The flow structure and heat transfer characteristics on the impinged surface are predicted through a comprehensive numerical transient simulation as well as an experimental oil flow visualization. The complicated multi-jet impinging flow is simulated by solving the unsteady Reynolds-averaged Navier-Stokes (RANS) equations with compressibility correction. The near-wall resolution is accomplished by employing an improved analytic wall function (AWF) approach. The oil flow testing is conducted to reveal the flow patterns of parallel multiple impinging jets, using a practical scarfing unit. The deformable oil trace has successfully reproduced the impinging grooves on the flat plate. The results indicated that the generated grooves on the impinged surface are mainly triggered by the multi-jet attraction and combination mechanism caused by the Coanda effect. The defined merging point (MP) location and impinging groove degree are employed to examine the multi-jet flow evolution and the corresponding impinging performance. The heat transfer characteristic on the impinged surface is highly dependent on Reynolds number, jet-to-jet spacing and jet-to-plate spacing. While the flow structure presents insensitive to Reynolds number.
Subject Interdisciplinary Engineering not elsewhere classified
Mechanical Engineering not elsewhere classified
Keyword(s) Heat transfer
Impinging groove
Impinging jets
Multiple jets
DOI - identifier 10.1016/j.applthermaleng.2018.01.064
Copyright notice © 2018 Elsevier Ltd. All rights reserved.
ISSN 1359-4311
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