Hele Shaw Cell
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. LIQUID-LIQUID DISPLACEMENT FLOWS IN A HELE-SHAW CELL INCLUDING NON-NEWTONIAN EFFECTS / DESLOCAMENTO DE LÍQUIDOS EM CÉLULA DE HELE-SHAW CONSIDERANDO EFEITOS NÃO NEWTONIANOS
This work studied the displacement of fluids in porous media using a Hele-Shaw cell. Specifically, was investigated experimentally the displacement of a non-Newtonian fluid by a Newtonian in a rectangular Hele-Shaw cell. The Saffman-Taylor or viscous fingering instability occurs when one fluid pushes a more viscous one, and a Hele-Shaw is a convenient tool t
Publicado em: 2010
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2. Um problema de fronteira livre para um sistema eliptico-hiperbolico : uma aplicação ao crescimento de tumores / A free boundary problem for an elliptic-hyperbolic system : an application to tumor growth
In this dissertation we detail the analysis done in the article by X. Chen, A. Friedman, A free boundary problem for an elliptic-hyperbolic system,: an application to tumor growth, SIAM J. Math. Anal. 35, 2003, which considers a free boundary value problem for an elliptic-hyperbolic system of partial differential equations related to the Hele-Shaw problem. T
Publicado em: 2010
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3. SoluÃÃes exatas para arranjos periÃdicos de bolhas na cÃlula de Helen-Shaw
In this thesis exact solutions for the problem of multiple bubbles in a Hele-Shaw cell are presented for the case when surface tension effects are neglected. The solutions reported here describe a doubly-periodic array of bubbles that move with constant velocity in the x direction. In a reference frame that moves with the bubbles, the bubble centroids are lo
Publicado em: 2008
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4. Efeitos da forÃa de Coriolis na cÃlula de Hele-Shaw girante: estabilidade linear e dinÃmica nÃo-linear
Um nÃmero crescente de trabalhos teÃricos e experimentais tem investigado variados aspectos da formaÃÃo de padrÃes de interface em fluidos confinados na cÃlula de Hele-Shaw girante. Entretanto, apenas uma pequena parte desses trabalhos considera a influÃncia da forÃa de Coriolis. Estudos que incluem o efeito da forÃa de Coriolis estÃo em sua maiori
Publicado em: 2007
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5. Ferrofluidos em cÃlulas de Hele-Shaw de espaÃamento variÃvel: o papel do campo magnÃtico e dos estresses viscosos
Neste trabalho de dissertaÃÃo, exploramos analiticamente o fluxo de um ferrofluido newtoniano confinado entre duas placas planas e paralelas. Analisamos o desenvolvimento de instabilidades de interface quando a placa superior à levantada, sob a aÃÃo de um campo magnÃtico aplicado. Obtivemos uma equaÃÃo diferencial de modos acoplados para o sistema, c
Publicado em: 2007
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6. SimulaÃÃo de fluidos imiscÃveis em meios porosos atravÃs de autÃmatos celulares de gÃs na rede
In this study, we investigated the displacement of two immiscible fluids in bidimensional porous media by means of models of lattice gas cellular automata. Such an automaton can reproduce the behavior of the Navier-Stokes equation, along with the Laplace equation for the case of two immiscible fluids and, besides, can implement conditions of complex contour
Publicado em: 2007
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7. Pattern formation in granular systems / Formação de padrões em meios granulares
In this work we study the pattern formation in the interface between two types of granular materials in a Hele-Shaw cell. Different types of patterns, ranging from almost circular to fingered ones were observed, varying the ratio between the size of the grains and the cell spacing. The transition from patterns with fingers to rounded patterns seems to be con
Publicado em: 2006
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8. Dynamics of the labyrinthine patterns at the diffuse phase boundaries
The phase diagram of a magnetic colloid in a Hele-Shaw cell is calculated. As a function of the magnetic field strength, of the concentration and of the layer thickness the magnetic colloid can find itself in a stripe phase, the hexagonal phase or in an unmodulated state. Those results allow to interpret experiments observing the transformation of a labyrint
Braz. J. Phys.. Publicado em: 2001-09
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9. Interfacial instabilities in confined ferrofluids
We investigate the flow of two immiscible, viscous fluids in the confined geometry of a Hele-Shaw cell. We consider that one of the fluids is a ferrofluid and that an external magnetic field is applied. The interfacial instabilities which arise between the fluids are studied for various situations: (a) different cell geometries (radial, rectangular); (b) fro
Braz. J. Phys.. Publicado em: 2001-09