每年出版 12 期
ISSN 打印: 1044-5110
ISSN 在线: 1936-2684
Indexed in
EFFECT OF SEMICYLINDRICAL COUNTER ELECTRODES ON THE CONE-JET MODE OF ELECTROSPRAY
摘要
The effect of counter electrode curvature on the onset voltage and spray angle of the electrospray in the cone-jet mode is experimentally investigated. Six counter electrodes, including a conventional flat electrode, and five curved (both concave and convex) electrodes are considered. The curvature of the curved electrodes was in the range of 10−33.3 m-1. The applied voltage, the voltage range of the cone-jet mode, and geometrical features such as the liquid cone length and spray angle are measured. It was observed that the ground electrode curvature could manipulate the electric field and equipotential lines in a way that results in higher or lower onset voltage of the cone-jet mode for convex and concave electrodes, respectively. In addition, the operating range or "stability island" grows by convex electrodes and decreases by concave electrodes. Simulation of electric potential lines is introduced to explain this effect further. In general, the ground electrode shape can intensify or abate the density of the equipotential lines in the vicinity of the liquid meniscus at the capillary tip. The cone-jet mode onset voltage equation is modified to include this effect. Moreover, the spray shape was affected by the curved electrodes. In both configurations, the spray angle increases; however, in the case of the concave electrodes, the actual spray coverage is much closer to the theoretical spray coverage.
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Alexander, M.S., Stark, J., Smith, K.L., Stevens, B., and Kent, B., Electrospray Performance of Microfabricated Colloid Thruster Arrays, J. Propul. Power, vol. 22, no. 3, pp. 620-627, 2006.
-
Allaf-Akbari, E. and Ashgriz, N., An Electrospray in a Gaseous Crossflow, J. Aerosol Sci., vol. 114, pp. 233-243,2017.
-
Balachandran, W., Miao, P., and Xiao, P., Electrospray of Fine Droplets of Ceramic Suspensions for Thin-Film Preparation, J. Electrost., vol. 50, no. 4, pp. 249-263,2001.
-
Chiarot, P.R., Sullivan, P., and Ben Mrad, R., An Overview of Electrospray Applications in MEMS and Microfluidic Systems, J. Microelectromech. Syst., vol. 20, no. 6, pp. 1241-1249,2011.
-
Ciach, T., Microencapsulation of Drugs by Electro-Hydro-Dynamic Atomization, Int. J. Pharm., vol. 324, no. 1,pp. 51-55,2006.
-
de la Mora, J.F. and Loscertales, I.G., The Current Emitted by Highly Conducting Taylor Cones, J. Fluid Mech., vol. 260, pp. 155-184,1994.
-
Fenn, J.B., Electrospray Wings for Molecular Elephants (Nobel Lecture), Angew. Chem, Int. Ed., vol. 42, no. 33, pp. 3871-3894,2003.
-
Ganan-Calvo, A.M., The Surface Charge in Electrospraying: Its Nature and Its Universal Scaling Laws, J. Aerosol Sci., vol. 30, no. 7, pp. 863-872,1999.
-
Hartman, R.P.A., Brunner, D.J., Camelot, D.M.A., Marijnissen, J.C.M., and Scarlett, B., Electrohydrodynamic Atomization in the Cone-Jet Mode Physical Modeling of the Liquid Cone and Jet, J. Aerosol Sci., vol. 30, no. 7, pp. 823-849,1999.
-
Hayati, I., Bailey, A.I., and Tadros, T.F., Investigations into the Mechanisms of Electrohydrodynamic Spraying of Liquids: I. Effect of Electric Field and the Environment on Pendant Drops and Factors Affecting the Formation of Stable Jets and Atomization, J. Colloid Interface Sci., vol. 117, no. 1, pp. 205-221,1987.
-
Jaworek, A. and Krupa, A., Classification of the Modes of EHD Spraying, J. Aerosol Sci., vol. 30, no. 7, pp. 873-893,1999.
-
Jaworek, A., and Krupa, A., Main Modes of Electrohydrodynamic Spraying of Liquids, in Proc. of Third Int. Conf. on Multiphase Flow, pp. 8-12,1998.
-
Jones, A.R. and Thong, K.C., The Production of Charged Monodisperse Fuel Droplets by Electrical Dis-persion, J. Phys. D: Appl. Phys., vol. 4, no. 8, p. 1159,1971.
-
Kim, H.H., Teramoto, Y., Negishi, N., Ogata, A., Kim, J.H., Pongrac, B., Machala, Z. and Ganan-Calvo, A.M., Polarity Effect on the Electrohydrodynamic (EHD) Spray of Water, J. Aerosol Sci., vol. 76, pp. 98-114,2014.
-
Krpoun, R., Micromachined Electrospray Thrusters for Spacecraft Propulsion, PhD, EPFL, 2009.
-
Li, C., Chang, M., Yang, W., Madden, A., and Deng, W., Ballpoint Pen Tips as Robust Cone-Jet Electrospray Emitters, J. Aerosol Sci., vol. 77, pp. 10-15,2014.
-
Martin, S., Perea, A., Garcia-Ybarra, P.L., and Castillo, J.L., Effect of the Collector Voltage on the Stability of the Cone-Jet Mode in Electrohydrodynamic Spraying, J. Aerosol Sci., vol. 46, pp. 53-63,2012.
-
Naderi, P., Shams, M., and Ghassemi, H., Investigation on the Onset Voltage and Stability Island of Electrospray in the Cone-Jet Mode Using Curved Counter Electrode, J. Electrost., vol. 98, pp. 1-10, 2019.
-
Paine, M.D., Alexander, M.S., Smith, K.L., Wang, M., and Stark, J.P.W., Controlled Electrospray Pulsation for Deposition of Femtoliter Fluid Droplets onto Surfaces, J. Aerosol Sci., vol. 38, no. 3, pp. 315-324, 2007.
-
Parhizkar, M., Reardon, P.J.T., Knowles, J.C., Browning, R.J., Stride, E., Barbara, P.R., Harker, A.H., and Edirisinghe, M., Electrohydrodynamic Encapsulation of Cisplatin in Poly (Lactic-Co-Glycolic Acid) Nanoparticles for Controlled Drug Delivery, Nanomedicine, vol. 12, no. 7, pp. 1919-1929,2016.
-
Park, H., Kim, K., and Kim, S., Effects of a Guard Plate on the Characteristics of an Electrospray in the Cone-Jet Mode, J. Aerosol Sci, vol. 35, no. 11, pp. 1295-1312,2004.
-
Rosell-Llompart, J., Grifoll, J., and Loscertales, I.G., Electrosprays in the Cone-Jet Mode: From Taylor Cone Formation to Spray Development, J. Aerosol Sci., vol. 125, pp. 2-31,2018.
-
Rulison, A.J. and Flagan, R.C., Scale-Up of Electrospray Atomization Using Linear Arrays of Taylor Cones, Rev. Sci. Instrum., vol. 64, no. 3, pp. 683-686,1993.
-
Smith, D.P.H., The Electrohydrodynamic Atomization of Liquids, IEEE Trans. Ind. Appl., vol. 22, no. 3, pp. 527-535,1986.
-
Taylor, G.I., Disintegration of Water Drops in an Electric Field, ProcR. Soc. London, Ser. A, vol. 280, no. 1382, pp. 383-397,1964.
-
Ueda, H., Takeuchi, K., and Kikuchi, A., Effect of the Nozzle Tip's Geometrical Shape on Electrospray Deposition of Organic ThinFilms, Jpn. J. Appl. Phys, vol. 56, no. 4S, p. 04CL05,2017.
-
Wang, Z., Xia, L., Tian, L., Wang, J., Zhan, S., Huo, Y., and Tu, J., Natural Periodicity of Electrohydrodynamic Spraying in Ethanol, J. Aerosol Sci., vol. 117, pp. 127-138,2018.
-
Zhao, X.-Y., Li, C., Yang, W., and Deng, W., Based Electrospray Emitters, J. Aerosol Sci., vol. 113, pp. 108-113,2017.
-
Ma Dongyun, Chang Shinan, Yang Chen, Investigation on Film Formation Characteristics of Pressure-Swirl Nozzle, Coatings, 11, 7, 2021. Crossref