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

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.

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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://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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