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The atomization current and droplet size of ethanol in two different small-scale electro-spraying systems

Gan, Yunhua; Zhang, Xia; Li, Haige; Tong, Yang; Shi, Yanling; Yan, Yuying


Yunhua Gan

Xia Zhang

Haige Li

Yang Tong

Yanling Shi

Professor of Thermofluids Engineering


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.


Gan, Y., Zhang, X., Li, H., Tong, Y., Shi, Y., & Yan, Y. (2017). The atomization current and droplet size of ethanol in two different small-scale electro-spraying systems. Journal of Electrostatics, 87,

Journal Article Type Article
Acceptance Date May 5, 2017
Online Publication Date May 17, 2017
Publication Date Jun 1, 2017
Deposit Date May 30, 2017
Publicly Available Date Nov 18, 2018
Journal Journal of Electrostatics
Print ISSN 0304-3886
Electronic ISSN 0304-3886
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 87
Keywords Cone-jet mode; Electro-spraying; Atomization current; Droplet size; Droplet velocity; Non-dimensional analysis
Public URL
Publisher URL


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