The influence of history effects on the diffusion-driven dissolution of CO2 bubbles

Emmerik, C.I. van (2015) The influence of history effects on the diffusion-driven dissolution of CO2 bubbles.

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Abstract:In this research the growth and dissolution process of a CO2 bubble in a CO2-water solution was investigated. The bubble grew at slightly oversaturated conditions and we were particularly interested in the bubble dissolution under different saturation conditions.The experiments were done in a controlled environment where a bubble grew from a cavity with a pre-existing gas pocket when the CO2-water solution was made slightly oversaturated. The bubbles were of a micrometer scale and the process was visualised using a camera with a microscope objective. The dissolution was induced by a change in saturation condition from oversaturated to saturated, under- or marginally oversatured. A theoretical relation was derived to describe the growth and dissolution of a bubble under those changing conditions. The experimental results are compared with numerical simulations of this relation. However, the comparisons did not show full agreement for several reasons that we explore in this work. One explanation is that convection was neglected in the derivation of the theory. Even though convection was not dominant over di�usion it could have influence on the results. Another explanation is that the simulations are based on several choices and assumptions, which were especially critical for the dissolution of a bubble under saturated conditions.
Item Type:Essay (Master)
Faculty:TNW: Science and Technology
Subject:33 physics
Programme:Applied Physics MSc (60436)
Link to this item:http://purl.utwente.nl/essays/67177
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