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Главная Архив Thermal Letter Оргкомитет Будущие конференции AIHTC
International Heat Transfer Conference 9

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

DEVELOPMENT OF DISTURBANCES IN LAMINAR AND TRANSITION REGIONS of FREE CONVECTION BOUNDARY LAYER ALONG A VERTICAL PLATE

Masahide Miyamoto
Department of Mechanical Engineering, Yamaguchi University Tokiwadai, Ube 755, Japan

Y. Katoh
Department of Mechanical Engineering, Yamaguchi University Tokiwadai, Ube 755, Japan

J. Kurima
Department of Mechanical Engineering, Yamaguchi University Tokiwadai, Ube 755, Japan

K. Jyojima
Department of Mechanical Engineering, Yamaguchi University Tokiwadai, Ube 755, Japan

K. Ike
Department of Mechanical Engineering, Yamaguchi University Tokiwadai, Ube 755, Japan

DOI: 10.1615/IHTC9.3210
pages 501-506

Аннотация

The downstream growth of velocity and temperature disturbances in the laminar and transition regions of the free convection boundary layer along a vertical plate with uniform heat generation in air was experimentally studied, using a fine thermocouple and LDV. The beginning and end of transitions were determined by the vertical temperature distribution on the heated plate, which is maximum at the beginning and minimum at the end of transition. Modified Grashof numbers at the beginning vary widely, but those at the end of transition seem to be approximated by about 5×l012. The maximum intensities of the streamwise velocity and temperature across the boundary layer reach maximum at the end of transition and become roughly half of each streamwise maximum intensity at the beginning of transition.

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