Experiment on Spatio-Temporal Turbulent Structures of a Natural Convection Boundary Layer

[+] Author and Article Information
T. Tsuji, Y. Nagano, M. Tagawa

Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466, Japan

J. Heat Transfer 114(4), 901-908 (Nov 01, 1992) (8 pages) doi:10.1115/1.2911899 History: Received August 01, 1990; Revised May 01, 1992; Online May 23, 2008


The spatio-temporal structures of a turbulent natural convection boundary layer along a vertical flat plate in air have been examined using a thermocouple rake and a pair of hot-wire/cold-wire arrangements. The instantaneous temperature profile clearly indicates the evolution of a large-scale motion originating in the outer region of the boundary layer. However, the space-time correlation measurements did not suggest the existence of any quasi-coherent structures such as low-speed streaks and bursts. The convection (or advection) velocity and characteristic length scales of turbulence were also investigated. The convection velocity exceeds the local mean velocity in the near-wall and outermost regions. The microscale of the thermal field shows a strongly anisotropic structure, and the integral scale indicates a large-scale structure normal to the wall.

Copyright © 1992 by The American Society of Mechanical Engineers
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