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Heat Transfer Research
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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v42.i7.20
pages 613-628

Numerical Simulation of Vortex Heat Transfer Enhancement in Transformer Oil Flow in a Channel with One-Row Spherical Dimples

Sergey A. Isaev
Saint Petersburg State University of Civil Aviation, 38 Pilotov Str., St. Petersburg, 196210, Russia; Tupolev Kazan National Research Technical University – Kazan Aviation Institute, 10 K. Marx Str., Kazan, Tatarstan, 420015, Russia
Alexander Leontiev
Joint Institute for High Temperatures
Yu. V. Zhukova
Turbulence Laboratory, A. V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, P. Brovka Str. 15, 220072 Minsk, Belarus
P. A. Baranov
Saint-Petersburg State University of Civil Aviation, Saint-Petersburg, 196210, Russia
Mikhail Gotovskii
I. I. Polzunov Scientific and Development Association on Research and Design of Power Equipment (NPO TsKTI), 3/6 Atamanskaya Str., St. Petersburg, 191167, Russia
Aleksandr Evguenyevich Usachov
Central Aerohydrodynamic Institute (TsAGI) 1, Zhukovsky str., Zhukovsky, 140180, Moscow region, Russia

ABSTRACT

Convective heat transfer in laminar flow of transformer oil in a narrow channel (2 × 0.5 cross section) with vortex generators shaped as spherical dimples with a depth of 0.2 (in fractions of dimple spot diameter) placed at a heated wall surface is calculated using computational multiblock technologies for solution of the Navier−Stokes and energy equations within the framework of the generalized pressure correction procedure. Based on the comparison of channels with 15 and 121 dimples and a periodic module subject to periodic boundary conditions, vortex heat transfer enhancement is analyzed in comparison with a smooth channel without dimples and approximately fivefold heat transfer enhancement is validated.


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