An experimental research on the instability of natural convection boundary layer around a vertical heated flat plate |
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Authors: | Yan Dachun Tao Jianjun |
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Institution: | (1) Department of Mechanics and Engineering Sciences, Peking University, 100871 Beijing, China |
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Abstract: | Experimental results on the instability of the isothermal naturalconvection boundary layer around a vertical heated flat plate
are presented. It is demonstrated that the characteristics of the instability wave in the outer layer is consistent with the
calculation of Brewster & Gebhart. After an initial growth of its low frequency components at the downstream side of the turning
point of the neutral curve (Gr≈120) its comparatively higher frequency components develop and become turbulent subsequently with a buoyancy subrange in
its power spectra. Simultaneously, in the measurement at the inner layer near the wall a viscous instability signal the same
as the Tollmien-Schlichting waves in ordinary boundary layer and its subharmonics in a much higher frequency domain is discovered
and an inertial subrange can be observed in the spectra atGr≈378.6.
The project supported by the National Natural Science Foundation of China (19572004) |
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Keywords: | natural-convection boundary layer instability transition buoyancy subrange |
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