Develpment of ultrahigh density charge accumulation method using the growth and the contraction of plasma-induced bubbles

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K13864
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Fluid engineering
• Research Institution: Tohoku University
• Principal Investigator: SATO Takehiko 東北大学, 流体科学研究所, 教授 (10302225)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 気泡内放電 / 可視化 / レーザー誘起気泡 / 放電電流 / 帯電 / 数値解析 / 高密度電荷

Outline of Final Research Achievements

This research aimed at forming very high density of electric charge by using a collapse process of a plasma-induced bubble. The bubble was formed by a nano-pulse laser of 532 nm and a discharge was generated using a submerged narrow electrode with application of positive or negative voltages. The collapse process of the bubble was visualized by a high speed camera of 10 Mfps in frame rate. Thus, a device which can discharge in a laser-induced bubble and can visualize the phenomenon was successfully developed. It was found that streamer channels were generated when the diameter of the bubble decrease in the cases of positive and negative voltage although the streamer was not generated without the discharge. This result implies that the elevated density of the charge probably generated a high potential which is greater than the threshold of inception electric field strength for the streamer. This is an important founding to develop a method to accumulate high density of electric charge.

Free Research Field

プラズマ流体工学