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Research Papers

Inclination Angle Optimization for “Inclined Projected Winglet Pair” Vortex Generator

[+] Author and Article Information
Mohammad Oneissi

Mechanical Engineering Department,
Lebanese International University,
P.O. Box 146404, Mazraa,
Beirut 1105, Lebanon;
Industrial Energy Department,
IMT Lille Douai,
Douai 59500, France
e-mail: mohammad.oneissi@liu.edu.lb

Charbel Habchi

Mem. ASME
Thermofluids Research Group,
Notre Dame University–Louaize,
P.O. Box 72,
Zouk Mikael 1200, Lebanon
e-mail: charbel.habchi@ndu.edu.lb

Serge Russeil

Industrial Energy Department,
IMT Lille Douai,
Douai 59500, France
e-mail: serge.russeil@imt-lille-douai.fr

Daniel Bougeard

Industrial Energy Department,
IMT Lille Douai,
Douai 59500, France
e-mail: daniel.bougeard@imt-lille-douai.fr

Thierry Lemenand

LARIS,
ISTIA,
Angers University,
LARIS EA 7315,
Angers 49000, France
e-mail: thierry.lemenand@univ-angers.fr

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received September 28, 2017; final manuscript received September 1, 2018; published online October 23, 2018. Assoc. Editor: Ting Wang.

J. Thermal Sci. Eng. Appl 11(1), 011014 (Oct 23, 2018) (10 pages) Paper No: TSEA-17-1369; doi: 10.1115/1.4041438 History: Received September 28, 2017; Revised September 01, 2018

Vortex generators (VG) are widely used in multifunctional heat exchangers/reactors for augmenting the heat transfer from fin plates to the working fluid. In this study, numerical simulations for longitudinal VGs are performed for both laminar and turbulent flow regimes. The shear-stress transport (SST) κω model is used for modeling turbulence. Inclination angle for a new streamlined VG configuration called inclined projected winglet pair (IPWP) was varied to study the effect of this angle on the heat transfer enhancement and pressure drop. Response surface methodology (RSM) was used to deduce the inclination angle effects on heat transfer, pressure drop, and vorticity from both local and global points of view. Such study highlights the optimization for this VG configuration for better heat transfer intensification, based on thermal enhancement factor (TEF). Finally, it is found that the VG with inclination angle ranging from 30 deg to 35 deg exhibits the best global performance compared to other inclination angles. This type of studies is important for the enhancement of the thermal performance of heat exchangers and static mixers in various engineering applications.

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Figures

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Fig. 1

Isometric view of the computational domain and the boundary conditions. The upper wall was hidden for the sake of clarity.

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Fig. 2

Delta winglet pair (or IPWP-0), IPWP-30 and IPWP-60 geometric dimensions and parameters

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Fig. 3

Response surface methodology representing the Nusselt number of the IPWP function of Reynolds number and inclination angle (α)

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Fig. 4

Response surface methodology representing the friction factor of the IPWP function of Reynolds number and inclination angle (α)

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Fig. 5

Response surface methodology representing the thermal enhancement factor of the IPWP function of Reynolds number and inclination angle (α)

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Fig. 10

Vortex core detected by λ2 criterion for the IPWP-30, IPWP-40, IPWP-50, and IPWP-60 at Re = 4600 at different planes x/H between 2.6 and 11.7

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Fig. 9

Velocity streamlines for the IPWP-30, IPWP-40, IPWP-50, and IPWP-60 at Re = 4600 at different planes x/H between 2.6 and 11.7

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Fig. 8

Local helicity for the cases DWP and IPWP with inclinations

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Fig. 7

Normalized friction factor for the cases DWP and IPWP with inclinations

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Fig. 6

Normalized Nusselt number for the cases DWP and IPWP with inclinations

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