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DNS of Heat Transfer in a Transitional Channel Flow Accompanied by a Turbulent Puff-like Structure

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.300
pages 193-196

Takahiro Tsukahara
Department of Mechanical Engineering, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba, 278-8510, Japan

Kaoru Iwamoto
Department of Mechanical Engineering, Tokyo University of Science, Noda-shi, Chiba 278-8510; Department of Mechanical System Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan

Hiroshi Kawamura
Department of Mechanical Engineering Faculty of Science and Technology Science University of Tokyo Noda-shi, Chiba 278 Japan

T. Takeda
Nuclear Science and Engineering Directorate, Japan Atomic Energy Agency, Oarai-machi, Higashi Ibaraki-gun, Ibaraki 311-1393, Japan

Abstract

Direct numerical simulation of heat transfer in a fully developed channel flow has been carried out in a range of low Reynolds numbers from Reτ = 180 down to 60 (based on the friction velocity and the channel half width δ) with emphasis on a puff-like structure. For Reτ ≤ 80 with the largest computational domain of 51.2δ × 2δ × 22.5δ, the turbulent puff is observed and significantly affects the momentum and heat transports. The spatial structure of the equilibrium puff is examined with taking account of two different thermal boundary conditions. It is revealed that there exists a localized strong turbulent region, in which a secondary flow is induced by the puff. In consequence, at the present lowest Reynolds number as low as Reτ = 60, the flow remains turbulent and the larger Nusselt numbers than those without puff is obtained.

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