Before revision: For example, the fraction of particles leaving the control volume at time with an age greater or equal than is quantified by means of the washout function , that is the complementary to one of the cumulative exit age distribution: Averages Mean age and mean residence time The mean age of all the particles inside the control volume at time t is the first moment of the age distribution: The mean residence time or mean transit time of the particles leaving the control volume at time t is the first moment of the residence time distribution: The mean age and the mean transit time generally have different values, even in stationary conditions: : examples include water in a lake with the inlet and outlet on opposite sides and radioactive material introduced high in the stratosphere by a nuclear bomb test and filtering down to the troposphere.
After revision: This drinking trough hasFor example, the fraction of particles leaving the control volume at time with an age greater or equal than is quantified by means of the washout function , that is the complementary to one of the cumulative exit age distribution: Averages Mean age and mean residence time The mean age of all the particles inside the control volume at time t is the first moment of the age distribution: The mean residence time or mean transit time of the particles leaving the control volume at time t is the first moment of the residence time distribution: The mean age and the mean transit time generally have different values, even in stationary conditions: : examples include water in a lake with the inlet and outlet on opposite sides and radioactive material introduced high in the stratosphere by a nuclear bomb test and filtering down to the troposphere.