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CO2 diffusion into water
Posted 2021年8月4日 GMT-4 09:39 Fluid & Heat, Chemical, Heat Transfer & Phase Change Version 5.6 0 Replies
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Hi,
I am trying to model the diffusion of CO2 into water with no initial dissolved CO2 inside. Both gas (CO2) and water phases are in an impermeable chamber with a specific ratio of volumes: Vgas/Vwater and a constant temperature. The initial gas pressure is known, and it decreases as CO2 dissolves in the water by passing time until the equilibrium is reached based on Henry’s law. The aim is to calculate the CO2 concentration counter in the water and the pressure drop in the gas phase for different times and equilibrium time. I used Transport of Diluted Species to model this problem and implemented Henry’s law as a boundary condition of interface for each domain as follows:
N=M(C_(CO2,water) - C_(CO2,gas)/H_(CO2,water) ) (1)
N=M(C_(CO2,gas) - C_(CO2,water)*H_(CO2,water)) (2)
Equations (1) and (2) are the boundary conditions for interface flux in the gas and water domains, respectively. Where M is the stiff spring velocity and is considered a large number like 10^5 m/s. The CO2 concentrations are also defined as variables. However, during solving, the concentration in water is little and does not change over time. Any ideas and hints are highly appreciated.
Thanks, Sara
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Hello Sara Esmaeilian
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