- Author
- Lui, P. S. K. | Megaw, W. J.
- Title
- Spread Factors for Oil-Based and Water Droplets.
- Coporate
- York Univ., Ontario, Canada
- Journal
- Journal of Aerosol Science, Vol. 17, No. 2, 169-177, 1986
- Keywords
- droplets
- Abstract
- The determination of droplet size distributions is of importance in many fields and the method of collecting drops on a suitably prepared substrate is still popular, primarily because of its simplicity. The size distribution of impressions left by the droplets on the substrate is measured and the droplet size distribution determined by the application of spread factors, which have generally been determined by comparing measured or calculated droplet sizes with the impressions made by them on the substrates. Many workers have extended the use of particular spread factors beyond the range for which they were determined or have applied factors determined for a particular substrate to others. In the present work spread factors have been determined for a series of oils and oil-based insecticides on kromekote cards and for water on Basacid Green/gelatin-coated slides and film coated with polyvinyl acetate. It was found that the spread factor for oils and insecticides varied with the compositon of the oil and also with droplet size. The spred factor for polyvinyl acetate film differs considerably from that used by previous workers and also from that for Basacid-Green/gelatin-coated slides.