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http://hdl.handle.net/2445/187803
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DC Field | Value | Language |
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dc.contributor.advisor | Maher, J. V. | - |
dc.contributor.advisor | Ortín, Jordi, 1959- | - |
dc.contributor.author | Ignés i Mullol, Jordi | - |
dc.contributor.other | Universitat de Barcelona. Departament d'Estructura i Constituents de la Matèria | - |
dc.date.accessioned | 2022-07-18T09:05:11Z | - |
dc.date.available | 2022-07-18T09:05:11Z | - |
dc.date.issued | 1997-06-26 | - |
dc.identifier.uri | http://hdl.handle.net/2445/187803 | - |
dc.description.abstract | [eng] We have performed pattern formation experiments where a relatively well understood system (flow in a Hele-Shaw cell) is perturbed either by means of a lattice of grooves or by the use of viscoelastic fluids. We have extended the qualitative analysis found in the literature for anisotropic fingering patterns, presenting a more quantitative approach that may prove useful as a tool to attack more complex problems. We have analyzed the different morphological regimes and looked for signatures of the transition between phases, with partial success when we try to characterize a given morphology quantitatively. In our studies of viscoelastic Hele-Shaw flow with associative polymer solutions, we have observed a transition from viscous fingering patterns into a regime where the growing patterns resemble the fracture in brittle solids. We have been able to rescale the threshold for these transitions, and we have observed interesting properties in a regime of fracturelike patterns where, under sorne circumstances, we have measured a characteristic oscillation frequency which shows interesting regularities. We have also studied the pressure in the viscoelastic flow, and found consistent results that may be used to implement a better theoretical model to fully understand the dynamics. | ca |
dc.format.extent | 127 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | ca |
dc.publisher | Universitat de Barcelona | - |
dc.rights | cc by (c) Ignés i Mullol, Jordi, 2022 | - |
dc.rights.uri | http://creativecommons.org/licenses/by/3.0/es/ | * |
dc.source | Tesis Doctorals - Departament - Estructura i Constituents de la Matèria | - |
dc.subject.classification | Dinàmica de fluids | - |
dc.subject.classification | Pertorbació (Dinàmica quàntica) | - |
dc.subject.other | Fluid dynamics | - |
dc.subject.other | Perturbation (Quantum dynamics) | - |
dc.title | Experiments on perturbed Saffman-Taylor flows | ca |
dc.type | info:eu-repo/semantics/doctoralThesis | ca |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | ca |
dc.identifier.tdx | http://hdl.handle.net/10803/674811 | - |
Appears in Collections: | Tesis Doctorals - Departament - Estructura i Constituents de la Matèria |
Files in This Item:
File | Description | Size | Format | |
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JIM_PhD_THESIS.pdf | 16.66 MB | Adobe PDF | View/Open |
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