Experimental investigation on carbon dioxide dissolution in saline aquifers
Tutor / director / evaluatorDe Paoli, Marco
CovenanteeTechnische Universität Wien
Document typeMaster thesis
Rights accessOpen Access
Since the industrial development has become one of the main factors in human's life, carbon dioxide (CO2) emissions to the atmosphere has increased considerably over the last 40 years. This enhancement represents one of the main issues that governments are concerned about because of its e ects and consequences, known as greenhouse e ect. In order to reduce the quantity of CO2 in the atmosphere, di erent strategies are proposed, studied and applied. One of them consists in injecting the gas in underground geological formations, with the aim of keeping it there safely and as long as possible. One of the trapping mechanisms that play a key role in this storage process is the solubility trapping. In this thesis, related to the experimental investigation on this mechanism, potassium permanganate (KMnO4) is used to investigate the dissolution dynamics of CO2 in water. This chemical component has been chosen instead of CO2 due to its bene ts: similar properties in less severe environmental conditions (pressure and temperature) in the laboratory, no need to use a porous media (this is the media underground) to get a better analysis of the experiments and the time required to run the experiments (hours in KMnO4 case whereas hundreds of years in CO2). In this thesis the procedure followed to simulate the real process of mixture between both substances, accomplished in a Hele Shaw cell is explained. It has been derived a relationship between the mass fraction of the solution and the light intensity of the pictures taken, an essential step in order to analyse the images. This process is totally experimental. We identi ed the best con guration to initiate the mixture without disturbances and be as more representative as possible of the real process. And nally, we have also compared the results obtained, distinguishing 3 regimes (di usive, constant and shutdown) with the results got, numerically, by De Paoli et al. (2017). The in uence of the Rayleigh number on the regimes, in particular on their onset, requires further investigations and is left for future work.