Fundamental Experiments of Water Jet Released from Micro-tube with Micro-discharge

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The water jet from the canaliculus driven by electric micro-discharge was visualized. A coaxial electrode was employed for the micro-discharge. A canaliculus was a commercially available PVC tube. The inside of the canaliculus was filled with isotonic sodium chloride solution. The supply of the sodium solution was kept with syringe pump constantly. When the amount of the sodium solution supply was smaller than 100ml/hr, a water jet traveled at a constant speed with present experimental configuration. On the other hand, the jet acceleration with the sodium solution supply larger than 100ml/hr was faster about immediate velocity after the discharge. Additionally, it was confirmed that the water jet might be driven twice. The same phenomenon had been seen previously. Next, the bubble formed around the electrode was visualized. Many tiny bubbles were generated like a cloud. The bubbles were really different from a sphere bubble shape seen in laser using. A discharge voltage and electric current were measured at the same time. The speed of the jet became faster when there were two spikes in the waveform of the voltage. And from comparison of the visualized images and the waveforms of discharge voltage, We could anticipate that such jet acceleration was caused by discharge through water vapor or air in the bubbles. When electric discharge occurred in the sodium solution, we did not observe a similar phenomenon.
2005-12-31