We report here on an experimental study of heat transfer augmentation in turbulent flow. Enhancement strategies employed in this investigation are based on the near-wall mixing processes induced in the sublayer through appropriate wall and near-wall streamwise-periodic disturbances. Experiments are performed in a low-turbulence wind-tunnel with a high-aspect-ratio rectangular channel having either (a) two-dimensional periodic microgrooves on the wall, or (b) two-dimensional microcylinders placed in the immediate vicinity of the wall. It is found that micro-disturbances placed inside the sublayer induce favorable heat-transport augmentation with respect to the smooth-wall case, in that near-analogous momentum and heat transfer behavior are preserved; a roughly commensurate increase in heat and momentum transport is termed favorable in that it leads to a reduction in the pumping power penalty at fixed heat removal rate. The study shows that this favorable performance of microcylinder-equipped channel flows is achieved for microcylinders placed inside y+ ≃20, implying a dependence of the optimal position and size on Reynolds number. For microgrooved channel flows, favorable augmentation is obtained for a wider range of Reynolds numbers; however, optimal enhancement still requires a matching of geometric perturbation with the sublayer scale.
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Turbulent Heat Transfer Augmentation Using Microscale Disturbances Inside the Viscous Sublayer
H. Kozlu,
H. Kozlu
Massachusetts Institute of Technology, Department of Mechanical Engineering, Cambridge, MA 02139
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B. B. Mikic,
B. B. Mikic
Massachusetts Institute of Technology, Department of Mechanical Engineering, Cambridge, MA 02139
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A. T. Patera
A. T. Patera
Massachusetts Institute of Technology, Department of Mechanical Engineering, Cambridge, MA 02139
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H. Kozlu
Massachusetts Institute of Technology, Department of Mechanical Engineering, Cambridge, MA 02139
B. B. Mikic
Massachusetts Institute of Technology, Department of Mechanical Engineering, Cambridge, MA 02139
A. T. Patera
Massachusetts Institute of Technology, Department of Mechanical Engineering, Cambridge, MA 02139
J. Heat Transfer. May 1992, 114(2): 348-353 (6 pages)
Published Online: May 1, 1992
Article history
Received:
November 8, 1989
Revised:
July 11, 1991
Online:
May 23, 2008
Citation
Kozlu, H., Mikic, B. B., and Patera, A. T. (May 1, 1992). "Turbulent Heat Transfer Augmentation Using Microscale Disturbances Inside the Viscous Sublayer." ASME. J. Heat Transfer. May 1992; 114(2): 348–353. https://doi.org/10.1115/1.2911282
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