Abstract
Unsteady pressure measurements have been performed inside a spherical dimple in a narrow channel for turbulent flow at Re D = 40,000 with the aim to study coherent vortex structures and to get a deep insight into flow physics. Results confirm the formation of asymmetric coherent vortex structures switching between two extreme positions. Analysis of the pressure temporal distributions and correlation functions shows the presence of the anti-phase motion inside the dimple. Typical power laws of the pressure fluctuation energy spectrum ω − 1 and ω − 7/3 are reproduced.
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References
Chyu, M.K., Yu, Y., Ding, H., Downs, J.P., Soechting, F.O.: Concavity enhanced heat transfer in an internal cooling passage. ASME No. 97-GT-437 (1997)
Elyyan, M.A., Rozatia, A., Tafti, D.K.: Investigation of dimpled fins for heat transfer enhancement in compact heat exchangers. Int. J. Heat Mass Transf. 51(11–12), 2950–2966 (2007)
Gravante, S.P., Naguib, A.M., Wark, C.E., Nagib, H.M.: Characterization of the pressure fluctuations under a fully developed turbulent boundary layer. AIAA J. 36(10), 1808–1816 (1998)
Isaev, S.A., Leont’ev, A.I., Baranov, P.A., Pyshnyi, I.A.: Numerical analysis of the influence of the depth of a spherical hole on a plane wall on turbulent heat transfer. J. Eng. Phys. Thermophys. 76, 52–59 (2003)
Isaev, S.A., Kornev, N.V., Leontiev, A.I., Hassel, E.: Influence of the Reynolds number and the spherical dimple depth on turbulent heat transfer and hydraulic loss in a narrow channel. Int. J. Heat Mass Transf. 53(1–3), 178–197 (2010)
Jovanovic, J., Frohnapfel, B., Delgado, A.: Viscous drag reduction with surface embedded grooves. Notes Numer. Fluid Mech. Multidiscip. Des. 110, 191–197 (2010)
Kornev, N., Turnow, J., Hassel, E., Isaev, S., Wurm, F.: Fluid Mechanics and heat transfer in a channel with spherical and oval dimples. Notes Numer. Fluid Mech. Multidiscip. Des. 110, 231–237 (2010)
Ligrani, P.M., Oliveira, M.M., Blaskovich, T.: Comparison of heat transfer augmentation techniques. AIAA J. 41(3), 337–362 (2003)
Schewe, G.: On the structure and resolution of wall pressure fluctuations associated with turbulent boundary layer flow. J. Fluid Mech. 134, 311–328 (1983)
Terekhov, V.I., Kalinina, S.V., Mshvidobadse, Y.M.: Heat transfer coefficient and aerodynamic resistance on a surface with a single dimple. Enhanc. Heat Transf. 4, 131–145 (1997)
Turnow, J., Kornev, N., Isaev, S., Hassel, E.: Vortex mechanism of heat transfer enhancement in a channel with spherical and oval dimples. Heat Mass Transf. 47(3), 301–313 (2011)
Willmarth, W.: Pressure fluctuations beneath turbulent boundary layers. Annu. Rev. Fluid Mech. 7, 13–37 (1975)
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Voskoboinick, V., Kornev, N. & Turnow, J. Study of Near Wall Coherent Flow Structures on Dimpled Surfaces Using Unsteady Pressure Measurements. Flow Turbulence Combust 90, 709–722 (2013). https://doi.org/10.1007/s10494-012-9433-9
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DOI: https://doi.org/10.1007/s10494-012-9433-9