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CO 2 convective dissolution has been regarded as one of the fundamental mechanisms to accelerate the mass transfer of CO 2 into brine. We present a new spectrophotometric method to characterize the convective instability and measure the dissolved CO 2 mass, which enables the real-time quantitative visualization of CO 2 /brine transport mechanisms. Successive images were captured to identify the finger development regimes, and the convection morphologies were analyzed by the fingers length and affected area. CO 2 solubility was experimentally studied, and the results are in agreement with the theoretical calculations. CO 2 mass transfer flux was investigated as the Sherwood number changed. The increase in salinity and temperature has a negative effect on CO 2 dissolution; here, numerical simulation and experimental phenomena are qualitatively consistent. In general, these findings confirm the feasibility of the method and improve the understanding of the physical process of CO 2 convective dissolution, which can help assess the CO 2 solubility trapping mass.

New Spectrophotometric Method for Quantitative Characterization of Density-Driven Convective Instability