Deposition of airborne droplets Sample Clauses

Deposition of airborne droplets. (Ddhapp) The air concentration (Cair) (derived from the ART model) together with the droplet setting velocity (vdep) and the application time (t) will determine the degree of exposure via deposition (𝐸𝑞𝑢𝑎𝑡𝑖𝑜𝑛 1). The Stoke law’s defines the droplet setting velocity as a factor directly proportional to the diameter of the droplet (m) multiplied by the gravitational acceleration and by the differences in density between the droplet and the air (kg∙m-3). This velocity is inversely proportional to the dynamic viscosity of the air (Kg m-1∙s-1) (see equation 7). Droplets <100 µm are regarded as prone to drift to non-target surfaces (Xxxxxxxxx et al., (2011); Xxxxxx & Xxxxx, (2000); Xxxxxxx & Xxxxxxxx, (1992)). On the other hand, droplets <50 µm take a long time to deposit (Xxxxxxxx & Xxxxxxxx 1991). Moreover, they can evaporate in a time shorter than 1.8 seconds under certain climatic conditions (Xxxxxx & Xxxxxxx, 2001) and therefore they were not considered relevant for the assessment of potential dermal exposure. Inputs parameter used to estimate the droplet setting velocity are presented in Table 4. 2 ϕ 2 v = · δg − δa · ·g
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