Flows due to pressure induced dissociation-formation of gas hydrates

Rodríguez Agudo J, Kwon S, Saur R, Loekman S, Luzi G, Rauh C, Wierschem A, Delgado A (2017)

Publication Type: Journal article

Publication year: 2017

Journal

IOP Conference Series: Materials Science and Engineering IOP Publishing: Conference Series

Book Volume: 249

Article Number: 012018

DOI: 10.1088/1757-899X/249/1/012018

Open Access Link: https://iopscience.iop.org/article/10.1088/1757-899X/249/1/012018/pdf

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.

Authors with CRIS profile

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

How to cite

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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