Abstract
The effects of dimples in altering time-averaged flow behavior occur mostly within one-half of one dimple print diameter from the surface, and the dimples within the arrays periodically eject a primary vortex pair from each dimple, which exists in conjunction with edge vortex pairs that form along the spanwise edges of staggered dimples regardless of three dimple depths. As the dimple depth increases, deeper dimples eject stronger primary vortex pairs, with hig her levels of turbulence transport due to larger deficits of time-averaged, normalized total pressure and streamw ise velocity as the surfaces with deeper dimples are approached. Primary vortex pair ejection frequencies range about 7–9 Hz, and edge vortex pair oscillation frequencies range about 5–7 Hz forR eH =20,000, regardless of dimple depths.
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V. N. Afanasyev, Y. P. Chudnovsky, A. I. Leontiev and P. S. Roganov, Turbulent flow friction and heat transfer characteristics for spherical cavities on a flat plate,Experimental Thermal and Fluid Science. 7 (1993) 1–8.
M. Y. Belen’kiy, M. A. Gotovskiy, B. M. Lekakh, B. S. Fokin and K. S. Dolgushin, Heat transfer augmentation using surfaces formed by a system of spherical cavities,Heat Transfer Research. 25 (2) (1994) 196–203.
V. S. Kesarev and A. P. Kozlov, Convective heat transfer in turbulized flow past a hemispherical cavity,Heat Transfer Research. 25 (2) (1994) 156–160.
V. I. Terekhov, S. V. Kalinina and Y. M. Mshvidobadze, Flow structure and heat transfer on a surface with a unit hole depression,Russian Journal of Engineering Thermophysics. 5 (1995) 11–33.
A. V. Schukin, A. P. Koslov and R. S. Agachev, Study and application of hemispherical cavities for surface heat transfer augmentation, ASME Paper No. 95-GT-59, ASME 40th International Gas Turbine and Aeroengine Congress and Exposition, Houston, Texas (1995).
Y. F. Gortyshov, I. A. Popov, R. D. Amirkhanov and K. E. Gulitsky, Studies of hydrodynamics and heat exchange in channels with various types of intensifiers, Proceedings of 11th International Heat Transfer Congress, 6 (1998) 83–88.
Y-L. Lin, T. I-P. Shih and M. K. Chyu, Computations of flow and heat transfer in a channel with rows of hemispherical cavities, ASME Paper No. 99-GT-263, ASME 44th International Gas Turbine and Aeroengine Congress and Exposition, Indianapolis, Indiana, (1999).
H-K. Moon, T. O’Connell and B. Glezer, Channel height effect on heat transfer and friction in a dimpled passage, ASME Paper No. 99-GT-163, ASME 44th International Gas Turbine and Aeroengine Congress and Exposition. Indianapolis, Indiana, (1999).
G. I. Mahmood, M. L. Hill, D. L. Nelson, P. M. Ligrani, H-K. Moon and B. Glezer, Local heat transfer and flow structure on and above a dimpled surface in a channel,ASME Transactions-Journal of Turbomachinery 123 (1) (2001) 115–123.
V. I. Terekhov and S. V. Kalinina, Flow and heat transfer in a single spherical cavity: state of the problem and unanswered questions (Review),Thermophysics and Aeromechanics. 9 (4) (2002) 475–496.
G. I. Mahmood, M. Z. Sabbagh and P. M. Ligrani, Heat transfer in a channel with dimples and protrusions on opposite walls,AIAA Journal of Thermophysics and Heat Transfer. 15 (3) (2001) 275–283.
P. M. Ligrani, G. I. Mahmood, J. L. Harrison, C. M. Clayton and D. L. Nelson, Flow structure and local Nusselt number variations in a channel with dimples and protrusions on opposite walls,International Journal of Heat and Mass Transfer. 44 (23) (2001) 4413–4425.
S. A. Isaev, A. I. Leontiev, N. A. Kudryavtsev and I. A. Pushnyi, The effect of rearrangement of the vortex structure on heat Transfer under conditions of increasing depth of a spherical dimple in the wall of a narrow channel,Teplofizika Vysokikh Temperature. 41 (2) (2003) 268–272.
S. Y. Won and P. M. Ligrani, Numerical predictions of flow structure and local Nusselt number reatios along and above dimpled surfaces with different dimple depths in a channel,Numerical Heat Transfer Part A. 46 (2004) 549–570.
N. K. Burgess, M. M. Oliveira and P. M. Ligrani, Nusselt number behavior on deep dimpled surfaces within a channel,ASME Transactions-Journal of Heat Transfer. 125 (1) (2003) 11–18.
G. I. Mahmood and P. M. Ligrani, Heat transfer in a dimpled channel: combined influences of aspect ratio, temperature ratio, Reynolds number, and flow structure,International Journal of Heat and Mass Transfer. 45 (10) (2002) 2011–2020.
P. M. Ligrani, J. L. Harrison, G. I. Mahmood and M. L. Hill, Flow structure due to dimple depressions on a channel surface,Physics of Fluids. 13 (11) (2001) 3442–3451.
P. M. Ligrani, Flow visualization and flow tracking as applied to turbine components in gas turbine engines,Meas. Sci. Technol. 11 (2002) 992.
R. J. Moffat, Describing the uncertainties in experimental results,Experimental Thermal and Fluid Science. 1 (1) (1988) 3–17.
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Won, S.Y., Ligrani, P.M. Flow characteristics along and above dimpled surfaces with three different dimple depths within a channel. J Mech Sci Technol 21, 1901–1909 (2007). https://doi.org/10.1007/BF03177447
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DOI: https://doi.org/10.1007/BF03177447