Heat transfer enhancement in fin-plate heat exchangers by wing type vortex generators

Authors

  • Dr.-Ing. Udo Brockmeier,

    1. Lehrstuhl für Wärmeund Stoffübertragung, Institut für Thermo- und Fluiddynamik, Ruhr-Universität Bochum, Postfach 102148, D-4630 Bochum 1
    Current affiliation:
    1. Institut für Energietechnik, Lehrstuhl für Nukleare und Neue Energiesysteme, Ruhr-Universität Bochum
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  • Prof. Dr.-Ing. Martin Fiebig,

    1. Lehrstuhl für Wärmeund Stoffübertragung, Institut für Thermo- und Fluiddynamik, Ruhr-Universität Bochum, Postfach 102148, D-4630 Bochum 1
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  • Dipl. Ing. Thomas Güntermann,

    1. Lehrstuhl für Wärmeund Stoffübertragung, Institut für Thermo- und Fluiddynamik, Ruhr-Universität Bochum, Postfach 102148, D-4630 Bochum 1
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  • Priv. Doz. Dr. Nimai K. Mitra

    1. Lehrstuhl für Wärmeund Stoffübertragung, Institut für Thermo- und Fluiddynamik, Ruhr-Universität Bochum, Postfach 102148, D-4630 Bochum 1
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  • Dedicated to Professor Dr. Klaus Gersten on the occasion of his birthday.

Abstract

Heat transfer and fluid mechanical data were computed for laminar channel flows containing strong longitudinal vortex pairs. The strong vortices are generated by thin delta wings and delta winglet pairs of low aspect ratios and large angles of attack. These wings are attached to the channel walls. The data show that longitudinal vortices cause high local peaks in heat transfer and marked increases in the overall channel heat transfer. These increases occur over a wide region of channel wall, compared to the vortex generating wing area. The results are of special interest for compact heat exchangers. The heat transfer enhancement allows a considerable reduction in the heat transfer area which, in turn, reduces the manufacturing and operating costs.

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