An experimental study of density-driven convection of fluid pairs with viscosity contrast in porous media

Teng, Ying1,2,3; Wang, Pengfei3,4,5; Jiang, Lanlan3; Liu, Yu3; Song, Yongchen3; Wei, Yang1

2020

10.1016/j.ijheatmasstransfer.2020.119514

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER   影响因子和分区

0017-9310

1879-2189

CO2 dissolution in saline water during aquifer sequestration causes natural convection because of the density difference between CO2-saturated brine and native brine. In this study, the convective fingers behavior during convection in porous media was visualized by magnetic resonance imaging (MRI). Four kinds of miscible fluid pairs were used as the equivalents of CO2-saturated brine and native brine. Images of finger development were obtained. There are two types of convective fingers that form vertically symmetrical shapes: downward fingers of the dense fluid and upward fingers of the light fluid. The typical stages of natural convection, finger appearance, finger propagation, new finger generation, and finger coalescence were observed in this study. We analyzed the effects of viscosity contrast variation on convective onset. It was found that the viscosity contrast affects not only the convection time but also the finger growth velocity. The dimensionless mass transfer coefficient is characterized by the Sherwood number. The Sherwood number has a power law relationship with the Rayleigh number, with the exponent being larger than 1 for fluid pairs with apparent viscosity contrast. Experimental results showed that a higher viscosity contrast of the fluid pair causes a viscosity increase in the transition zone, resulting in lower mobility of the fluids and retarding convective mixing. For fluid pairs with similar densities, a high viscosity contrast is not conducive to efficient mass transfer in the density-driven convection process.
© 2020

Density-driven convection Viscosity contrast Sherwood number MRI CO2 sequestration

EI ; SCI

英语

其他

National Basic Research Program of China (973 Program)[2016YFB0600804] ; Dalian University of Technology[]

Thermodynamics ; Engineering ; Mechanics

Thermodynamics ; Engineering, Mechanical ; Mechanics

WOS:000528005400017

Elsevier Ltd

20200908216154

Aquifers ; Carbon dioxide ; Fluid Power ; Magnetic resonance imaging ; Mass transfer ; Natural convection ; Porous materials ; Saline water ; Viscosity

Water Resources:444 ; Groundwater:444.2 ; Fluid Flow, General:631.1 ; Heat Transfer:641.2 ; Mass Transfer:641.3 ; Imaging Techniques:746 ; Chemical Agents and Basic Industrial Chemicals:803 ; Inorganic Compounds:804.2 ; Materials Science:951

ENGINEERING

EV Compendex

1.Institute for Advanced Study, Shenzhen University, Shenzhen; 518060, China
2.College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen; 518060, China
3.Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian; 116024, China
4.SUSTech Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen; 518055, China
5.School of Earth and Space Sciences, University of Science and Technology of China, Hefei; 230026, China

Teng, Ying,Wang, Pengfei,Jiang, Lanlan,et al. An experimental study of density-driven convection of fluid pairs with viscosity contrast in porous media[J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,2020,152.

Teng, Ying,Wang, Pengfei,Jiang, Lanlan,Liu, Yu,Song, Yongchen,&Wei, Yang.(2020).An experimental study of density-driven convection of fluid pairs with viscosity contrast in porous media.INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,152.

Teng, Ying,et al."An experimental study of density-driven convection of fluid pairs with viscosity contrast in porous media".INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 152(2020).