Evaluation of a pneumatic drop-on-demand generator for application of agrochemical solutions |
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| Institution: | 1. University of Bonn, Institute of Crop Science and Resource Conservation (INRES), Horticultural Science, Auf dem Huegel 6, D-53121 Bonn, Germany;2. University of Bonn, Institute of Agricultural Engineering, Nussallee 5, D-53115 Bonn, Germany;1. Exploration & Development Research Institute of Shengli Oilfield Co., Ltd., SINOPEC, Dongying, 257015 Shandong, China;2. Technical Institute of Physics and Chemistry, Chinese Academy of Science, Beijing 100190, China;1. College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Shandong Normal University, Jinan 250014, China;2. Shandong Key Laboratory of TCM Quality Control Technology, Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), 19 Keyuan Street, Jinan 250014, China;1. College of Chemistry, Central China Normal University, Wuhan 430079, PR China;2. College of Chemistry and Materials Science, South-Central University for Nationalities, Wuhan 430074, PR China;1. Department of Engineering, University of Naples Parthenope, Centro Direzionale Napoli Isola C4, 80143 Naples, Italy;2. ENEA – Italian National Agency for New Technologies, Casaccia Research Center, Via Anguillarese 301, 00123 Rome, Italy;3. Fuel Cell Research Center, KIST - Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, South Korea;1. Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, Toulouse, France;2. Research Institute on Membrane Technology (ITM-CNR), University of Calabria, Via P. Bucci, 17/C, 87036 Arcavacata di Rende (CS), Italy;3. Department of Environmental Engineering and Land and Chemical Engineering, University of Calabria, Via P. Bucci, Cubo 44A, 87036 Rende (CS), Italy;4. Membrane Science & Technology, University of Twente, MESA+Institute for Nanotechnology, P.O. Box 217, 7500 AE Enschede, The Netherlands |
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| Abstract: | A simple and robust monodroplet generator was constructed for drop-on-demand application of aqueous solutions of pesticides to crop plants and weeds. A short current impulse regulated the opening of a solenoid valve, allowing pressurised nitrogen gas to flow into a liquid chamber. Once a jet is released from the nozzle, one single droplet is detached, and the remaining part is retracted back into the cylinder as the excess gas is exhausted. The effects of the impulse width, pressure, diameter of the orifice, and the surface tension of the liquids as influenced by adjuvants were evaluated in terms of droplet diameter and generation potentiality. In general, increasing the impulse width and orifice diameter led to an increase in the droplet diameter. In contrast, increased pressure and reduced surface tension of the liquid led to a decreased diameter, although the effect was observed only at lower impulse widths and larger orifice diameters. With an optimum adjustment, we were able to generate monodroplets with diameters ranging from 533 to 1819 μm, although the range could be varied easily by changing the parameters. |
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