The paper presents a comprehensive analysis of conditions for numerical simulation and physical modeling of convective heat transfer in the vicinity of dimpled surface relief. Contradictory results, unreasonable assumptions, and non-justified conclusions are marked. Based on the analysis of physical experiments the correlation between the predictions and measured data is discussed. Detailed numerical study of turbulent air flow and heat transfer in the narrow channel with three types of dimples (spherical, conic and oval) was carried out. Various mathematical and discrete models, including, those based on solving Reynolds-averaged Navier-Stokes equations (RANS/URANS-SST), and also adaptive scale models (SAS-SST) are compared. The influence of flow parameters (Reynolds number) and geometric sizes (dimple diameter, depth, radius of rounding off of an edge, channel width and height) on local and integral characteristics of flow and heat transfer (total heat output and hydraulic losses) is determined. Special attention is given to reorganizing vortex structures and flow regime (with periodic fluctuations) with increasing relative dimple depth and Reynolds number. For the first time the influence of the scale factor of a constant cross-section channel is detailed. Thermal-hydraulic characteristics of various dimpled reliefs are compared, and the advantage of an oval dimple over a spherical one is shown.
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2010 14th International Heat Transfer Conference
August 8–13, 2010
Washington, DC, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4937-8
PROCEEDINGS PAPER
Numerical Modeling and Physical Simulation of Vortex Heat Transfer Enhancement Mechanisms Over Dimpled Reliefs
Alexander I. Leontiev
,
Alexander I. Leontiev
Bauman State Technical University, Moscow, Russia
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Sergey A. Isaev
,
Sergey A. Isaev
State University of Civil Aviation, Saint-Petersburg, Russia
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Nikolai V. Kornev
,
Nikolai V. Kornev
University of Rostock, Rostock, Germany
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Yaroslav Chudnovsky
,
Yaroslav Chudnovsky
Drexel University, Philadelphia, PA
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Egon Hassel
Egon Hassel
University of Rostock, Rostock, Germany
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Alexander I. Leontiev
Bauman State Technical University, Moscow, Russia
Sergey A. Isaev
State University of Civil Aviation, Saint-Petersburg, Russia
Nikolai V. Kornev
University of Rostock, Rostock, Germany
Yaroslav Chudnovsky
Drexel University, Philadelphia, PA
Egon Hassel
University of Rostock, Rostock, Germany
Paper No:
IHTC14-22334, pp. 419-428; 10 pages
Published Online:
March 1, 2011
Citation
Leontiev, AI, Isaev, SA, Kornev, NV, Chudnovsky, Y, & Hassel, E. "Numerical Modeling and Physical Simulation of Vortex Heat Transfer Enhancement Mechanisms Over Dimpled Reliefs." Proceedings of the 2010 14th International Heat Transfer Conference. 2010 14th International Heat Transfer Conference, Volume 2. Washington, DC, USA. August 8–13, 2010. pp. 419-428. ASME. https://doi.org/10.1115/IHTC14-22334
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