caa a22 4500 606197591 CHVBK 20210128100930.0 cr unu---uuuuu 210128e20150701xx s 000 0 eng 10.1007/s00348-015-2012-9 doi (NATIONALLICENCE)springer-10.1007/s00348-015-2012-9 Impaction of spray droplets on leaves: influence of formulation and leaf character on shatter, bounce and adhesion [Elektronische Daten] [Gary Dorr, Shuangshuang Wang, Lisa Mayo, Scott McCue, W. Forster, Jim Hanan, Xiongkui He] This paper combines experimental data with simple mathematical models to investigate the influence of spray formulation type and leaf character (wettability) on shatter, bounce and adhesion of droplets impacting with cotton, rice and wheat leaves. Impaction criteria that allow for different angles of the leaf surface and the droplet impact trajectory are presented; their predictions are based on whether combinations of droplet size and velocity lie above or below bounce and shatter boundaries. In the experimental component, real leaves are used, with all their inherent natural variability. Further, commercial agricultural spray nozzles are employed, resulting in a range of droplet characteristics. Given this natural variability, there is broad agreement between the data and predictions. As predicted, the shatter of droplets was found to increase as droplet size and velocity increased, and the surface became harder to wet. Bouncing of droplets occurred most frequently on hard-to-wet surfaces with high-surface-tension mixtures. On the other hand, a number of small droplets with low impact velocity were observed to bounce when predicted to lie well within the adhering regime. We believe this discrepancy between the predictions and experimental data could be due to air layer effects that were not taken into account in the current bounce equations. Other discrepancies between experiment and theory are thought to be due to the current assumption of a dry impact surface, whereas, in practice, the leaf surfaces became increasingly covered with fluid throughout the spray test runs. Springer-Verlag Berlin Heidelberg, 2015 Dorr Gary Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, Australia aut Wang Shuangshuang Centre for Chemicals Application Technology, China Agricultural University, 100193, Beijing, China aut Mayo Lisa Mathematical Sciences, Queensland University of Technology, Brisbane, Australia aut McCue Scott Mathematical Sciences, Queensland University of Technology, Brisbane, Australia aut Forster W. Plant Protection Chemistry NZ Ltd, Rotorua, New Zealand aut Hanan Jim Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, Australia aut He Xiongkui Centre for Chemicals Application Technology, China Agricultural University, 100193, Beijing, China aut Experiments in Fluids Springer Berlin Heidelberg 56/7(2015-07-01), 1-17 0723-4864 56:7<1 2015 56 348 https://doi.org/10.1007/s00348-015-2012-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-2012-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dorr Gary Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, Australia aut NATIONALLICENCE 700 1- Wang Shuangshuang Centre for Chemicals Application Technology, China Agricultural University, 100193, Beijing, China aut NATIONALLICENCE 700 1- Mayo Lisa Mathematical Sciences, Queensland University of Technology, Brisbane, Australia aut NATIONALLICENCE 700 1- McCue Scott Mathematical Sciences, Queensland University of Technology, Brisbane, Australia aut NATIONALLICENCE 700 1- Forster W. Plant Protection Chemistry NZ Ltd, Rotorua, New Zealand aut NATIONALLICENCE 700 1- Hanan Jim Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, Australia aut NATIONALLICENCE 700 1- He Xiongkui Centre for Chemicals Application Technology, China Agricultural University, 100193, Beijing, China aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/7(2015-07-01), 1-17 0723-4864 56:7<1 2015 56 348