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The unstable modes of natural convection boundary layer

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Abstract

The instability of natural convection boundary layer around a vertical heated flat plate is analyzed theoretically in this paper. The results illustrate that the “loop” in the neutral curve is not a real loop but a twist of the curve in the frequency-wave number-Grashof number space, and there is only one unstable mode at small Prandtl numbers. Specially, when the Prandtl number is large enough two unstable modes will be found in the “loop” region. Along the amplyfying surface intersection the two unstable modes have the same Grashof number, wave number and frequency but different amplifying rates. Their instability characteristics are analyzed and the criterion for determining the existence of the multi-unstable modes is also discussed.

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Authors and Affiliations

  1. The Research Institute of Fluid Mechanics, Beijing University of Aeronautics and Astronautics, 100083, Beijing, China

    Tao Jianjun & Zhuang Fenggan

  2. Department of Mechanics and Engineering Sciences, Peking University, 100871, Beijing, China

    Yan Dachun

Authors
  1. Tao Jianjun
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  2. Zhuang Fenggan
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  3. Yan Dachun
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Jianjun, T., Fenggan, Z. & Dachun, Y. The unstable modes of natural convection boundary layer. Acta Mech Sinica 16, 217–222 (2000). https://doi.org/10.1007/BF02487663

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  • DOI: https://doi.org/10.1007/BF02487663

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