Different localized states of travelling-wave convection in a rectangular container |
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Authors: | Li Guo-Dong and Huang Yong-Nian |
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Institution: | Institute of Water Resources and Hydro-electric Engineering, Xi'an University of Technology, Xi'an 710048, China; State Key Laboratory for Studies of Turbulence and Complex Systems, Peking University, Beijing 100871, China |
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Abstract: | We have performed numerical simulations of localized travelling-wave convection in a
binary fluid mixture heated from below in a long rectangular container. Calculations
are carried out in a vertical cross section of the rolls perpendicular to their
axes. For a negative enough separation ratio, two types of quite different confined
states were documented by applying different control processes. One branch of
localized travelling waves survives only in a very narrow band within subcritical
regime, while another branch straddles the onset of convection existing both in
subcritical and supercritical regions. We elucidated that concentration field and
its current are key to understand how confined convection is sustained when
conductive state is absolutely unstable. The weak structures in the conducting
region are demonstrated too. |
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Keywords: | binary fluid mixture travelling-wave
convection localized states |
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