Formação de padrões em sistemas complexos

• Ano de defesa: 2004
• Autor(a) principal: Robson Luiz Santos
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Sistemas complexos; Física
• Link de acesso: http://hdl.handle.net/1843/ESCZ-692GEJ

In this work an experimental study of a pattern forming system was performed and analyzed. A general approach to properties of pattern formation is presented based on a non-equilibrium thermodynamic model, following results found in the literature. We present results of the experiment performed observing the destabilization of a °uid-°uid interface under a viscous °ow. Image processing techniques allowed us to obtain measurements of relevant interface information in order to capture the pattern dynamics. This way pattern growth rate dispersion curve was measured and found to be in good agreement with the theoretical model, in a region close to the bifurcation. Full qualitative agreement was obtained in the whole range of °ow conditions used.Analysis of the mean interface position also delivered important information, and showed a critical behavior at the bifurcation. This opens the possibility of future observations concerning precursor dynamics in this system.