EXPERIMENTAL INVESTIGATION OF DENDRITIC DEPOSITION OF AEROSOL-PARTICLES

Deposition of monodisperse aerosol particles on a single metal fiber was studied experimentally under conditions of dominant inertial impaction and interception. Formation of dendrites was observed, in accordance with previous experimental work. During each run, the deposition process was interrupted at regular intervals and the deposits on the same area on the fiber surface were examined; each time, the angular positions of the individual dendrites and their sizes and configurations were recorded and photographed. Thus, the growth of several individual dendrites was followed as a function of angular coordinate and time. These data can be used to evaluate theoretical models of aerosol particle deposition with dendritic pattern. In the present work the model developed by Payatakes and Gradón (1979) is compared with the data. The theoretical rates of dendrite growth are found in good agreement with experiment. Systematic discrepancies between the theoretically predicted dendrite number distribution and the experimentally observed one suggest that the shadow effect" and skidding of particles (due to lubrication) prior to deposition on the fiber are significant. © 1979."