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Doctoral thesis . 2011 . Peer-reviewed
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https://doi.org/10.5821/disser...
Doctoral thesis . 2023 . Peer-reviewed
Data sources: Crossref
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Nomsothermal multiphase flow of brine and gas through saline media

Authors: Olivella Pastallé, Sebastià;

Nomsothermal multiphase flow of brine and gas through saline media

Abstract

Presentamos una formulación nueva para el análisis de problemas Termo-hidro-mecánicos en medios salinos. Esta formulación incluye, desde la obtención de ecuaciones de balance de masa, momento y energía hasta su resolución numérica, incluyendo la derivación de algunas ecuaciones constitutivas. El programa de calculo resultante (Code Bright) puede usarse para analizar problemas reales de sistemas de sellado construidos con agregados porosos de sal, que era la motivación original de este trabajo.<br/><br/>Las ecuaciones de balance se han formulado teniendo en cuenta que en un medio salino existen tres especies o componentes mayoritarios. Estos son: la sal, el agua y el aire. Uno de los aspectos diferenciadores respecto a otros medios geológicos es que la fase sólida se disuelve a concentraciones elevadas en la fase liquida a la que se llama Salmuera. Otro aspecto interesante es la presencia de inclusiones de salmuera en la fase sólida. La disolución y precipitación de la sal da lugar a un mecanismo de deformación por fluencia. La forma de los granos de sal cambia por disolución en las zonas donde se concentran las tensiones y recristalizacion en las zonas de menor estado tensional. Además los granos también se deforman por el carácter muy dúctil del propio sólido cristalino. Hemos derivado una nueva ley constitutiva tensión deformación para los agregados porosos de sal, que se basa en acoplar una geometría idealizada de los granos con los mecanismos fundamentales de deformación.<br/><br/>Una vez que se ha desarrollado y verificado el programa de cálculo, este ha sido aplicado para el estudio de diferentes fenómenos. Presentamos el análisis de las variaciones de porosidad inducidas por gradientes de temperatura en agregados porosos de sal no saturados. Las diferencias de temperatura inducen un flujo de vapor que es contrarrestado por un flujo de salmuera. Este arrastra la sal disuelta y da lugar a un flujo de sal hacia zonas de temperatura más alta.

Country
Spain
Keywords

Brine, porosity, salt dissolution, Heat inclusion, Precipitation, multiphase, precipitation, Vapour flux temperature gradient, creep, gas, Àrees temàtiques de la UPC::Enginyeria civil, Aggregate, Enginyeria hidràulica, deformation, Creep, 624, 55, Deformation, Salt dissolution, brine, :Enginyeria civil [Àrees temàtiques de la UPC], aggregate, Gas, vapour flux temperature gradient, Multiphase, Porosity, heat inclusion

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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