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DOI: 10.1615/HeatTransRes.v37.i5.20
pages 383-394

Heat Transfer in a Transverse Extended Cavity with Inclined Walls in a Turbulized Flow

A. Yu. D'yachenko
S. S. Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
Viktor I. Terekhov
Kutateladze Institute of Thermophysics, Laboratory of Thermal and Gas Dynamics, Russian Academy of Sciences, Siberian Branch, 630090,1, Acad. Lavrent'ev Avenue, Novosibirsk, Russia; Novosibirsk State Technical University, K. Markx av., 20, Novosibirsk, 630073, Russia
Nadezhda I. Yarygina
S. S. Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia

ABSTRACT

Experimental investigations of the influence of an external degree of turbulence on heat transfer intensification in a cavity with a small aspect ratio, with the angles of inclination of the lateral walls being varied from 30° to 90°, were carried out. It is shown that in a rectangular cavity the average heat-transfer rate over the surface at a turbulence level Tu0 of 6.5% increases by a factor of 1.2, whereas at Tu0 = 16% − by a factor of 1.4. The visualization of the patterns of vortex formation has shown that at angles φ = 60° or 70° the flow becomes extremely unstable, depending on the Reynolds number. For these angles one observes a marked enhancement of heat transfer which is strengthened at a high flow turbulence.


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