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Heat Transfer Enhancement in a Microtube with an In-Line Package of Spherical and Inclined Oval-Trench Dimples during Transformer-Oil Pumping

  • HEAT AND MASS TRANSFER AND PHYSICAL GASDYNAMICS
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High Temperature Aims and scope

Abstract

The vortex-induced intensification of the laminar (at Re = 308) flow of transformer oil and heat transfer in a microtube with an in-line package of dimples with a depth of 0.26 of the tube diameter is calculated based on the Navier–Stokes equations and the energy equation. The heat-transfer increased by nearly 20 times for eight inclined oval-trench dimples spaced around the circumference and by 13 times for spherical dimples equal in area in comparison with that for a smooth tube; moreover, the relative hydraulic losses grow by approximately 30 and 60%, respectively.

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Funding

This work was supported by the Russian Foundation for Basic Research, projects no. 18-58-00010 – analysis and no. 18-01-00210 – methodology, and by the Belorussian Republican Foundation for Basic Research, project no. F18R-035.

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Authors and Affiliations

  1. St. Petersburg State University of Civil Aviation, 196210, St. Petersburg, Russia

    S. A. Isaev & A. G. Sudakov

  2. Luikov Institute for Heat and Mass Transfer, Belarus Academy of Sciences, 220072, Minsk, Belarus

    A. D. Chornyi & Yu. V. Zhukova

  3. Central Aerohydrodynamic Institute, 107005, Moscow, Russia

    A. E. Usachov

Authors
  1. S. A. Isaev
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  2. A. G. Sudakov
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  3. A. D. Chornyi
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  4. Yu. V. Zhukova
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  5. A. E. Usachov
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Corresponding author

Correspondence to S. A. Isaev.

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Translated by M. Samokhina

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Isaev, S.A., Sudakov, A.G., Chornyi, A.D. et al. Heat Transfer Enhancement in a Microtube with an In-Line Package of Spherical and Inclined Oval-Trench Dimples during Transformer-Oil Pumping. High Temp 57, 885–888 (2019). https://doi.org/10.1134/S0018151X19040096

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  • DOI: https://doi.org/10.1134/S0018151X19040096

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