Flows due to pressure induced dissociation-formation of gas hydrates

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Details zur Publikation

Autorinnen und Autoren: Rodríguez Agudo J, Kwon S, Saur R, Loekman S, Luzi G, Rauh C, Wierschem A, Delgado A
Zeitschrift: IOP Conference Series: Materials Science and Engineering
Jahr der Veröffentlichung: 2017
Band: 249
ISSN: 1757-8981
eISSN: 1757-899X


Abstract

During the last decade, Gas Hydrates (GH) have attracted the interest of
the scientific community for engineering applications. Carbon dioxide
hydrate (CO2H), for instance, may play an important role for
capture and sequestration methods in order to reduce global climate
change. Despite the extensive literature, the transport phenomena
involved during CO2H formation are not yet fully understood. CO2
transfer from gas or liquid phase to the bulk of water is expected to
happen not only by molecular diffusion but also driven by natural
convective currents induced by CO2 dissolution in water.
Using particle tracer methods, we experimentally characterize the flow
velocity of the bulk of water during CO2H formation. For that purpose, CO2H is grown inside an optical cell with a volume of 12 mL at various pressures and temperatures. Due to CO2
dissolution, convection currents are noticed prior to hydrate
formation. Our experimental results point to a significant correlation
between this process and the subsequent hydrate formation. Two
well-differentiated hydrate growth patterns were observed depending on
the hydrate induction time and the corresponding CO2 concentration distribution inside water. For long induction times, CO2
can be provided from the water phase resulting in rapid growth. Short
induction times resulted in slow growth at the interface creating a
solid barrier accompanied by a significant drop in the flow velocity. In
some cases, the hydrate layer appeared to be unstable and convection
could restart.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Delgado, Antonio Prof. Dr.-Ing.
Lehrstuhl für Strömungsmechanik
Loekman, Soebiakto
Lehrstuhl für Chemische Reaktionstechnik
Luzi, Giovanni
Department Chemie- und Bioingenieurwesen
Rauh, Cornelia Prof.
Lehrstuhl für Strömungsmechanik
Rodríguez Agudo, José
Department Chemie- und Bioingenieurwesen
Saur, Roland
Lehrstuhl für Strömungsmechanik
Wierschem, Andreas Prof. Dr.
Professur für Hochdruckthermofluiddynamik und Rheologie


Zitierweisen

APA:
Rodríguez Agudo, J., Kwon, S., Saur, R., Loekman, S., Luzi, G., Rauh, C.,... Delgado, A. (2017). Flows due to pressure induced dissociation-formation of gas hydrates. IOP Conference Series: Materials Science and Engineering, 249. https://dx.doi.org/10.1088/1757-899X/249/1/012018

MLA:
Rodríguez Agudo, José, et al. "Flows due to pressure induced dissociation-formation of gas hydrates." IOP Conference Series: Materials Science and Engineering 249 (2017).

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Zuletzt aktualisiert 2019-30-07 um 09:38