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Article

Change in Convection Mixing Properties with Salinity and Temperature: CO2 Storage Application

Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, China
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Polymers 2020, 12(9), 2084; https://doi.org/10.3390/polym12092084
Received: 7 August 2020 / Revised: 1 September 2020 / Accepted: 3 September 2020 / Published: 14 September 2020
(This article belongs to the Special Issue Complex Fluids and Interfaces)
In this study, we visualised CO2-brine, density-driven convection in a Hele-Shaw cell. Several experiments were conducted to analyse the effects of the salinity and temperature. The salinity and temperature of fluids were selected according to the storage site. By using charge coupled device (CCD) technology, convection finger formation and development were obtained through direct imaging and processing. The process can be divided into three stages: diffusion-dominated, convection-dominated and shutdown stages. Fingers were formed along the boundary at the onset time, reflecting the startup of convection mixing. Fingers formed, moved and aggregated with adjacent fingers during the convection-dominated stage. The relative migration of brine-saturated CO2 and brine enhanced the mass transfer. The effects of salinity and temperature on finger formation, number, and migration were analysed. Increasing the salinity accelerated finger formation but suppressed finger movement, and the onset time was inversely related to the salinity. However, the effect of temperature on convection is complex. The dissolved CO2 mass was investigated by calculating the CO2 mass fraction in brine during convection mixing. The results show that convection mixing greatly enhanced mass transfer. The study has implications for predicting the CO2 dissolution trapping time and accumulation for the geological storage of CO2. View Full-Text
Keywords: convection mixing; finger; dissolved mass; CO2 storage convection mixing; finger; dissolved mass; CO2 storage
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MDPI and ACS Style

Jiang, L.; Wang, S.; Liu, D.; Zhang, W.; Lu, G.; Liu, Y.; Zhao, J. Change in Convection Mixing Properties with Salinity and Temperature: CO2 Storage Application. Polymers 2020, 12, 2084. https://doi.org/10.3390/polym12092084

AMA Style

Jiang L, Wang S, Liu D, Zhang W, Lu G, Liu Y, Zhao J. Change in Convection Mixing Properties with Salinity and Temperature: CO2 Storage Application. Polymers. 2020; 12(9):2084. https://doi.org/10.3390/polym12092084

Chicago/Turabian Style

Jiang, Lanlan, Sijia Wang, Donglei Liu, Weixin Zhang, Guohuan Lu, Yu Liu, and Jiafei Zhao. 2020. "Change in Convection Mixing Properties with Salinity and Temperature: CO2 Storage Application" Polymers 12, no. 9: 2084. https://doi.org/10.3390/polym12092084

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