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A schematic layout of the measurement. The blue tubes are made of PTFE. Note that the sizes of different parts of the layout are not in their real relative scales.
Breakthrough curve of a pulse of water vapor advected along an aged PTFE tube: Its normalized concentration as a function of dimensionless time (τ). Shown are the measured data (black dots), their fit by the sorption model (thick gray line), and by Taylor dispersion alone for (red dashed line) and (blue small dots). The fit by the sorption model was made with and ; the peak RH was 32% in the experiment.
Product of the fitting variables of the sorption model, , as a function of relative humidity (RH [%]) for a clean (light blue spheres) and an aged (black diamonds) tube.
Transfer functions (TF) as a function of frequency (f, [Hz]): Data from field measurements of turbulent fluctuations in water-vapor concentration in 2007 (black dots) and 2011 (black crosses), fits based on the proposed TF (Eq. (4) ), and fits based on a Lorentzian TF. RH = 58% and for both years. Fitting was made with and for 2007, and and for 2011.
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