Electrically forced microthreading of highly viscous dielectric liquids |
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Institution: | 1. Department of Aeronautics and Astronautics, School of Engineering, Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa, 259-1292, Japan;2. Malaysia-Japan International Institute of Technology, Kuala Lumpur, 54100, Malaysia;1. Key Laboratory for Organic Electronics & Information Displays (KLOEID), Jiangsu Engineering Centre for Plate Displays & Solid State Lighting, and Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, Nanjing, 210023, China;2. Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), School of Material Science and Engineering, Nanjing University of Posts & Telecommunications, Nanjing, Jiangsu, 211816, China;3. Department of Mechanical and Aerospace Engineering, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL, 32816, USA |
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Abstract: | The behaviour of three high viscosity (4875, 12 125 and 58 560 mPa s), dielectric liquids was investigated at flow rates of 10−10, 10−12 and 10−14 m3 s−1 and the applied voltage range 6–15 kV. In these experiments, due to the low electrical conductivity of the liquids (10−13 S m−1) and therefore the ensuing high electrical relaxation time, classical electrohydrodynamic atomization conditions are not satisfied. Only dripping and unstable jetting were observed at 4875 mPa s. A transition from no jetting to stable microthreading was observed for the 12 125 and 58 560 mPa s samples. The relics accompanying the transition were found to change from discrete droplets to a continuous filament. Stable microthreading, which generates uniform filaments, was obtained for the 12 125 mPa s sample at flow rates 10−10 and 10−12 m3 s−1 and in the case of the 58 560 mPa s sample at all the flow rates investigated. The high viscosity assisted stable microthreading with the filament diameter decreasing with increasing applied voltage and more dramatically decreasing with reducing flow rate. |
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