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Experimental Study on Repetition Frequency of Drop/Jet Movement in Electro-Spraying of Deionized Water

Category: Aerosol Physics and Instrumentation

Article In Press
DOI: 10.4209/aaqr.2017.05.0174
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Zhentao Wang 1,2, Lin Tian2, Lei Xia1, Jingliang Dong2, Junfeng Wang1, Jiyuan Tu2

  • 1 School of Energy and Power Engineering, Jiangsu University, Jiangsu 212013, China
  • 2 School of Engineering – Mechanical and Automotive Engineering, RMIT University, Melbourne VIC 3001, Australia

Highlights

Repetition frequency of drop or jet ejected from the nozzle was obtained.
The evolution of typical spraying modes was visualized.
The operating parameters on repetition frequency were discussed.


Abstract

The electro-spraying process can be regular and periodic, consisting of cyclical phases of initiation (meniscus, drop, and/or jet), pulsation, deformation and separation. This paper presents an experimental study on the repetition frequency of drop and/or jet ejection from the capillary end with various spraying modes during an electro-spraying process of deionized (DI) water. The influence of operating parameters such as applied voltage, liquid flow rate, electrical conductivity (DI) and the number of emitters is considered. The time evolution of drop and/or jet initiation, pulsation, deformation and separation from the capillary tip or meniscus was captured and analyzed in detail in different spraying modes. The repetition frequency was calculated offline based on the time-resolved images captured by a high-speed camera and was found to be highly affected by the electrical strength and dependent on the spraying mode. This frequency firstly increased and then decreased with an increase in applied voltage. Peak frequency and the applied voltage were related and both correlated to the liquid flow rate. The repetition frequency was very sensitive to the applied voltage at a low volume flow rate. Particular attention was given to the electro-spraying characteristics of single, double and triple emitters. The similarities and differences are discussed.

Keywords

Electro-spraying Repetition frequency High-speed camera Evolution Spraying mode Multiple emitters


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Accepted Manuscripts
DOI: 10.4209/aaqr.2017.01.0040
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