VELOCITY MEASUREMENTS IN A TURBULENT NATURAL CONVECTION BOUNDARY LAYER

1982 ◽  
Author(s):  
R. Cheesewright ◽  
E. Ierokiopitis
Keyword(s):  
Boundary Layer ◽  
Natural Convection ◽  
Convection Boundary Layer ◽  
Velocity Measurements ◽  
Turbulent Natural Convection ◽  
Convection Boundary

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

1992 ◽  
Vol 114 (4) ◽  
pp. 901-908 ◽  
Author(s):  
T. Tsuji ◽  
Y. Nagano ◽  
M. Tagawa
Keyword(s):  
Boundary Layer ◽  
Natural Convection ◽  
Large Scale ◽  
Outer Region ◽  
Convection Boundary Layer ◽  
Mean Velocity ◽  
Integral Scale ◽  
Turbulent Natural Convection ◽  
Convection Boundary ◽  
Spatio Temporal

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.

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