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International Heat Transfer Conference 6

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

ROLE OF LARGE-SCALE EDDY STRUCTURE ON ENHANCEMENT OF HEAT TRANSFER IN STAGNATION REGION OF TWO-DIMENSIONAL, SUBMERGED, IMPINGING JET

S. Yokobori
University of Tokyo, Tokyo, Japan

Nobuhide Kasagi
Center for Research and Development Strategy, Japan Science and Technology Agency; Department of Mechanical Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

Masaru Hirata
Dept. of Mechanical Engineering, The University of Tokyo, Tokyo 113, Japan; Shibaura Institute of Technology 307 Fukasaku, Saitama-shi, Saitama, 330-8570 Japan

Nobuhiko Nishiwaki
Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, Tokyo, Japan

DOI: 10.1615/IHTC6.1400
pages 305-310

Аннотация

This paper presents the experimental results on the flow-field and heat transfer characteristics in the stagnation region of a plane, submerged, impinging jet. From the observations of the plane stagnation flow field with the aid of flow-visualization techniques, it is found that the longitudinal vortex-like structures in large scales are formed discretely in space and time in this region. These structures have been extensively investigated both qualitatively and quantitatively and it is confirmed that the generation of such pair-vortex structures has to be deeply related with the natural distortions of the shear vortex filaments in the upstream free shear layer. Based on these observations a conceptual model for the vortex generation is suggested. The effects of these large-scale eddy structures on the enhancement of heat transfer rate are also investigated successively and it is concluded that these structures are predominant in the passive quantity transports in the stagnation region. The artificial augumentation of heat transfer phenomenon in the stagnation region is also indicated to be possible through a control of streamwise vortex generation by giving a small disturbance in the upstream free shear layer.

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