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Effect of Surface Curvature on Heat Transfer and Hydrodynamics Within a Single Hemispherical Dimple

[+] Author Affiliations
N. Syred, A. Khalatov

Cardiff University, Cardiff, United Kingdom

A. Kozlov

Russian Academy of Sciences, Kazan, Russia

A. Shchukin, R. Agachev

Kazan State Technical University (KAI), Kazan, Russia

Paper No. 2000-GT-0236, pp. V003T01A044; 6 pages
doi:10.1115/2000-GT-0236
From:
  • ASME Turbo Expo 2000: Power for Land, Sea, and Air
  • Volume 3: Heat Transfer; Electric Power; Industrial and Cogeneration
  • Munich, Germany, May 8–11, 2000
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7856-9
  • Copyright © 2000 by ASME

abstract

Turbulent heat transfer and hydrodynamics have been studied in concavely and convexly curved dimple in the range of Reynolds number from 1.3×105 to 3.1×105. The large scale single hemispherical dimple 50 mm diameter and 25 mm depth was arranged on a smooth concave or convex wall of curved rectangular-shaped passage. The fluid flow and heat transfer measurements, surface streamlines observations were performed within the flow curvature parameter δ**/R ranged from 0.002 to 0.007. The ‘tornado-like’ oscillating vortex bursting periodically out of dimple was registered in the experiments with a ‘curved’ dimple. This vortex structure is similar to that earlier observed in a ‘flat’ dimple. The surface curvature influences considerably the dimple heat transfer rate in both cases. It enhances heat transfer in a ‘concave’ dimple and reduces it in a ‘convex’ one, however the more remarkable effect is occurred in a concavely curved dimple. The correction factors describing the effect of curvature on average heat transfer in a ‘curved’ dimple have been obtained as a result of experimental study.

Copyright © 2000 by ASME

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