Quantifying the dynamic density driven convection in high permeability packed beds.
The density driven convection phenomenon is expected to have a significant and positive role in CO2geological storage capacity and safety. The onset and development of density-driven convective on the core scale is critical to understand the mass transfer mechanism. In this paper, laboratory experiments were conducted to investigate the density-driven convective in a vertical tube. The deuterium oxide (D2O)/manganese chloride (MnCl2) water solution in water or brine were as an analog for CO2-rich brine in original brine. Experiments are repeated with variations in permeability to vary the characteristic Rayleigh number. Based on the MRI technology, the intensity images showed the interface clearly, reflecting the transition from diffusion to convective. With the echo-multi-slice pulse sequence method, the intensity images can be obtained as 2min 8s. For the denser fluid pairs, fingers appeared, propagated, coalesced and multi-fingers formed. The finger growth rate of the convective was visualized as three distinct periods: rising, stable and declining. Detailed information regarding the wave number, wave length, onset time and mixing time as functions of Rayleigh number are developed.
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, 116024 Dalian, China.
Ying
Y
Teng
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, 116024 Dalian, China; Research Institute of Innovative Technology for the Earth, Kizugawa City, Kyoto 619-0292, Japan. Electronic address: lanlan@dlut.edu.cn.
Lanlan
L
Jiang
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, 116024 Dalian, China.
Yingting
Y
Fan
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, 116024 Dalian, China.
Yu
Y
Liu
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, 116024 Dalian, China.
Dayong
D
Wang
North Japan New Energy Research Center, Hirosaki University, Aomori City 0300831, Japan.
Abuliti
A
Abudula
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, 116024 Dalian, China.
Yongchen
Y
Song
D002712:Chlorides / Q000737:chemistry*; D018481:Convection; D017666:Deuterium Oxide / Q000737:chemistry*; D004058:Diffusion; D004867:Equipment Design; D008279:Magnetic Resonance Imaging; D017895:Manganese Compounds / Q000737:chemistry*; D010539:Permeability; D016062:Porosity; D014783:Viscosity; D014867:Water / Q000737:chemistry
D002712:Chlorides; D017895:Manganese Compounds; D014867:Water; D017666:Deuterium Oxide; C025340:manganese chloride
Density driven convection; Finger growth regimes; Mixing time; Onset time; Rayleigh number