Electrostatic spraying characteristics of twin fluid nozzle with outer annular induction charging electrode.

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  • 外部環状電極を用いた誘導帯電式２流体ノズルの静電散布特性
  • ガイブ カンジョウ デンキョク オ モチイタ ユウドウ タイデンシキ 2 リュ

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Abstract

A twin fluid nozzle with an outer annular induction charging electrode was designed and investigated to measure and to evaluate its deposit pattern, spread droplet size, collector current, power supply current and nozzle current.<br>The effects of applied voltage, atomizing air pressure, liquid flow rate and distance between nozzle and electrode on apparent charge to mass ratio were discussed.<br>With increase of applied voltage up to -5--8kV, the apparent charge to mass ratio increased very rapidly, and then decreased gradually. The higher the atomizing air pressure, the greater linearly the apparent charge to mass ratio. To obtain the efficient electrostatic spraying, it would be desired that liquid flow rate is lower, so that with increase of liquid flow rate, the apparent charge to mass ratio decreased.<br>Because of high correlation coefficient between the apparent charge to mass ratio and the deposit density, it would be possible to estimate the deposit density by the apparent charge to mass ratio.<br>In the case of this testing apparatus, the highest apparent charge to mass ratio was 3.2mC/kg under the condition that atomizing air pressure, liquid flow rate, distance between nozzle and electrode, and operating voltage were 392kPa, 130ml/min, 16mm, -7.8kV, respectively.

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