Experimental Determination of Droplet Impaction on Canopy Components of Balsam Fir

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Abstract
The capture efficiencies of balsam fir [Abies balsamea (L.) Mill] canopy components for monodisperse glycerin droplets were measured in a low-speed wind tunnel. Droplets were produced at sizes and wind speeds typical of cloudy conditions in a windy, subalpine environment. Capture efficiencies (CE) were evaluated on the basis of the Stokes number (STK) (an inertia parameter). Regression analyses produced a cubic equation relating CE to the independent variable, STK, with an R2 of 0.78. The data demonstrated a decline in CE when STK > 10, a departure from current theory. Droplet re-entrainment is suggested as a possible cause for this behavior. The utility of these data for modeling cloud droplet deposition is discussed. Abstract The capture efficiencies of balsam fir [Abies balsamea (L.) Mill] canopy components for monodisperse glycerin droplets were measured in a low-speed wind tunnel. Droplets were produced at sizes and wind speeds typical of cloudy conditions in a windy, subalpine environment. Capture efficiencies (CE) were evaluated on the basis of the Stokes number (STK) (an inertia parameter). Regression analyses produced a cubic equation relating CE to the independent variable, STK, with an R2 of 0.78. The data demonstrated a decline in CE when STK > 10, a departure from current theory. Droplet re-entrainment is suggested as a possible cause for this behavior. The utility of these data for modeling cloud droplet deposition is discussed.

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