Flow Condition in COMSOL

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Hello

How do we define a system, where the flow is continuous and thus can never go to zero? I am currently modeling a system, where I have to react a gas with a solid to produce a product. The gas is continuously reacting with the solid, and while partial pressure of gas can initially go to zero, as the solid reacts off, the gas should start to go back to it initial concentration. However, it is not, and at this point, I want to know if there any ways to incorporate the final conditions into COMSOL?


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