Investigation of Flow Around and in Wake of a Heated Circular Cylinder at Moderate Reynolds Numbers

Author:

Michálek P.1,Pospíšil S.1,Macháček M.1,Michalcová V.2

Affiliation:

1. Institute of Theoretical and Applied Mechanics, The Czech Academy of Sciences, Prosecká 76, Prague 190 00, Czech Republic

2. Department of Mechanics, Faculty of Civil Engineering, TU Ostrava, L. Podéště 1857, Ostrava 182 00, Czech Republic

Abstract

Abstract The flow around a heated circular cylinder and the wake behind it were studied in wind tunnel flow using two methods of anemometry, i.e., particle image velocimetry (PIV) and constant temperature anemometry (CTA) with a special technique using a rotating slanted hot-wire probe. The Reynolds number ranged from 2000 to 20,000 and the cylinder wall temperatures varied between 27 °C and 177 °C. The wake is characterized by mean wind and fluctuation contour maps. Significant changes in wake patterns were observed while the cylinder was being heated, thus increasing its wall temperatures at low Reynolds numbers. At higher Reynolds numbers, the effects of cylinder heating on wake properties were negligible. The research fills a gap observed in the literature for a certain combination of velocity, cylinder aspect ratio, and cylinder surface temperature.

Funder

Czech Science Foundation

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

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