THE SURFACE CHARGE IN ELECTROSPRAYING: ITS NATURE AND ITS UNIVERSAL SCALING LAWS |
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| Affiliation: | 1. School of Energy and Power Engineering, Jiangsu University, PO Box 28, Zhenjiang, Jiangsu 212013, China;2. School of Aerospace, Mechanical & Manufacturing Engineering, RMIT University, PO Box 71, Bundoora, VIC 3083, Australia;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. The Beijing Key Laboratory of Multiphase Flow and Heat Transfer, North China Electric Power University, Beijing, 102206, China;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 |
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| Abstract: | The electrospraying of liquids in steady cone-jet mode follows a well-defined EHD mechanism described and quantified in this work using a hybrid experimental–numerical technique: a collection of emitted microjet shapes corresponding to several liquids and different flow rates have been digitized and introduced in a quasi-one-dimensional analytical model. A universal value of the surface charge on the liquid microjet and the resulting charged droplets, independent of their size and of the liquid permittivity, has been found. The surface charge is shown to be always in equilibrium, being the liquid bulk quasi-neutral. From these findings, we finally present a consistent general scaling of all EHD variables involved which is experimentally verified. In this scaling, the electric current I and the characteristic microjet radius Ro are both proportional to the square root of the emitted flow rate, Q1/2, and independent of the liquid permittivity εi. |
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