The atomization current and droplet size of ethanol in two different small-scale electro-spraying systems |
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| Institution: | 1. School of Electric Power, South China University of Technology, Guangzhou, 510640, China;2. Guangdong Province Engineering Research Center of High Efficient and Low Pollution Energy Conversion, Guangzhou, 510640, China;3. Teaching and Training Center for Engineering Basis, South China Agricultural University, Guangzhou 510640, China;4. Fluids & Thermal Engineering Group, Faculty of Engineering, The University of Nottingham, University Park, Nottingham NG7 2RD, UK;1. Wetsus, Oostergoweg 9, Leeuwarden 8911 MA, The Netherlands;2. Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Den Dolech 2, Eindhoven 5612 AZ, The Netherlands;1. Department of Chemical Engineering, Istanbul Technical University, Istanbul, Turkey;2. Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta T6G 2G6, Canada;3. Heat and Fluid Flow Research Laboratory, University of Tabriz, Tabriz, Iran;4. IIHR-Hydroscience & Engineering, The University of Iowa, Iowa City, IA 52242, USA;5. Research Branch, Islamic Azad University, Tabriz 51666, Iran;1. School of Electric Power, South China University of Technology, Guangzhou 510640, China;2. Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy, North China Electric Power University, Beijing 102206, China;3. Fluids & Thermal Engineering Group, Faculty of Engineering, The University of Nottingham, University Park, Nottingham NG7 2RD, UK;4. Teaching and Training Center for Engineering Basis, South China Agricultural University, Guangzhou 510640, China;1. School of Electric Power, South China University of Technology, Guangzhou 510640, China;2. Department of Mechanical Engineering, The University of Sheffield, Sheffield S1 3JD, UK;1. School of Electric Power, South China University of Technology, Guangzhou 510640, China;2. Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization, South China University of Technology, Guangzhou 510640, China;3. Department of Mechanical Engineering, The University of Sheffield, Sheffield S1 3JD, UK;4. Teaching and Training Center for Engineering Basis, South China Agricultural University, Guangzhou 510640, China |
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| Abstract: | An experimental study on electro-spraying from small-scale combustors is carried out using liquid ethanol as fuel. Two systems of electro-spraying are employed in the present study; one is a nozzle system (without a ring electrode) and the other is a nozzle-ring system (with a ring electrode). The photos of electro-spraying at the cone-jet mode are taken by a digital camera. The voltage drop across the resistance in the loop is measured by a data acquisition instrument, and the atomization current is calculated according to Ohm's Law. The size and velocity of electro-spraying droplets are measured by a Phase Doppler Anemometer. A non-dimensional analysis on atomization current is completed to explain the electro-spraying phenomena of liquid at the stable cone-jet mode. The results show that, the lower atomization current and droplet velocity corresponds to smaller size of droplet. Based on the results of non-dimensional analysis, it is found that the dimensionless atomization current in both the nozzle system and nozzle-ring system obeys the scaling law as square root of the dimensionless flow rate. The charge density is of a ?1.5 power dependence on droplet diameter. Both of the nozzle and the nozzle-ring systems show a good agreement with Rayleigh instability. |
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| Keywords: | Cone-jet mode Electro-spraying Atomization current Droplet size Droplet velocity Non-dimensional analysis |
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