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Supporting Information J. Holocher, F. Peeters, W. Aeschbach-Hertig, W. Kinzelbach, R. Kipfer
 

Summary: S1
Supporting Information
J. Holocher, F. Peeters, W. Aeschbach-Hertig, W. Kinzelbach, R. Kipfer
"A kinetic model of gas bubble dissolution in groundwater and its
implications for the dissolved gas composition"
Environmental Science & Technology
S2
Sensitivity of the model to multiple bubble sizes
To examine the influence of a distribution of different bubble sizes on the dissolved
concentrations, the illustrative model simulations were repeated employing now four different bubble
size classes instead of only one single bubble size (0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm). The other
model parameters were not changed. The results are shown in Figure 1. From the bubble radii, we see
that a redistribution of the bubble sizes occurs in both scenarios ­ the vertical flow and the stagnating
situation. In both cases, a progression in the bubble extinction sequence exists which begins with the
smallest bubbles and ends with the largest bubbles. While the smaller bubbles dissolve, the larger
bubbles grow until finally the last remaining bubble size class is either dissolved completely
(advective flow regime) or maintained stable at the new equilibrium with the surrounding water
(stagnant flow regime). The reason for this characteristic behavior is the difference in the local
dissolved equilibrium concentrations for bubbles of different size. Due to the higher capillary
pressure in small bubbles, their local equilibrium concentrations in water are higher than for larger

  

Source: Aeschbach-Hertig, Werner - Institut für Umweltphysik, Universität Heidelberg

 

Collections: Geosciences; Environmental Sciences and Ecology