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Turbulent Thermal Diffusion Over a Locally-Heated Two-Dimensional Hill

[+] Author Affiliations
T. Houra, M. Tagawa

Nagoya Institute of Technology, Nagoya, Japan

Y. Nagano

Nagoya Industrial Science Research Institute; Nagoya Institute of Technology, Nagoya, Japan

Paper No. IHTC14-23117, pp. 769-775; 7 pages
doi:10.1115/IHTC14-23117
From:
  • 2010 14th International Heat Transfer Conference
  • 2010 14th International Heat Transfer Conference, Volume 2
  • Washington, DC, USA, August 8–13, 2010
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 978-0-7918-4937-8 | eISBN: 978-0-7918-3879-2
  • Copyright © 2010 by ASME

abstract

We measure flow and thermal fields over a locally heated two-dimensional hill. The heated sections on the wall are divided into upstream and downstream portions of the hill model. These sections are heated independently, yielding various thermal boundary conditions in contrast to the uniformly heated case. In the separated region formed behind the hill, it is found that the mean temperature profiles in the uniformly heated case are well decomposed into the separately heated cases. This is because the velocity fluctuation produced by the shear layer formed behind the hill is large, so the superposition of a passive scalar in the thermal field can be successfully realized. The rapid increase in the mean temperature near the uniformly heated wall should be due to the heat transfer near the leeward slope of the hill. On the other hand, the mean temperature distributions away from the wall are strongly affected by the turbulent thermal diffusion on the windward side of the hill.

Copyright © 2010 by ASME

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