Below is a crude simulation of tracking a contaminant in the air of a city. The overall concept is the same as performing a mass balance to track a contaminant in a lake.
We have mass being
generated (think of the reaction term in our lake model), the initial
mass in the air of the city M0, some mass leaving
the city (the control volume) and some mass entering the city from
outside Min.
Final mass | = | Initial mass + mass entering - mass exiting + mass being generated - mass decaying/reacting |
- or - | ||
Rate of Accumulation | = | Rate of Mass entering - Rate of mass exiting + Rate of reactions |
Next: Fumes
Up: Beginning
Previous: Some Physical Problems