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| Format: | Artículo científico |
| Language: | en |
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Sociedad Mexicana de Física A.C.
2004
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| Online Access: | https://www.redalyc.org/articulo.oa?id=57050603 |
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Table of Contents:
- Qualitative analysis of the capillary flow stability of spurting materials by using transmitted light intensity measurements E. Moreno García B.M. Marín Santibañez F. Rodríguez González J. Pérez González L.A. Vega Acosta M. Física, Astronomía y Matemáticas slip high birefringence Flow instabilities micellar solutions The stability in the capillary flow of spurting materials was analyzed by following the temporal variation of their average birefringence.Two different fluids were analyzed, a high-density polyethylene melt, and an aqueous micellar solution of Cetylpyridinium Chloride andSodium Salicylate. Birefringence changes were detected through measurements of the transmitted light intensity and video images of theflow channel. Transmitted light intensity measurements were more sensitive and provided better information about the flow stability thanpressure ones. An unstable flow region was present in the micellar solution before the onset of spurt. Also, there were periodic changes inthe optical properties of both fluids, in the spurt region and at higher shear rates, which indicate that the flow is also unstable in the high shearrate branch, in contrast to the generalized assumption of the stable flow in such regime. Several frequency components of the transmittedlight intensity were observed, coincident with different spurts, in the unstable flow regimes for both fluids. Finally, an outstanding decreasein the transmitted light intensity was observed in both fluids under flow conditions where slip was present. 2004 artículo científico 0035-001X https://www.redalyc.org/articulo.oa?id=57050603 en http://www.redalyc.org/revista.oa?id=570 Revista Mexicana de Física application/pdf Sociedad Mexicana de Física A.C. Revista Mexicana de Física (México) Num.Re6 Vol.50