Different localized states of travelling-wave convection in a rectangular container

• 来源期刊: 中国物理（英文版）
• 关键词: binary fluid mixture travelling-wave convection localized states
• 年，卷（期）: 2006,（12）
• 页码范围: 2984-2988
• 页数: 5页
• 语种: 英文

摘要

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.