Study on Generation method of Charged Droplets using resonant vibtration of water droplet under high electric field

• Project/Area Number: 15H03957
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Power engineering/Power conversion/Electric machinery
• Research Institution: Yamagata University
• Principal Investigator: Higashiyama Yoshio 山形大学, その他部局等, 名誉教授 (50144209)
• Co-Investigator(Kenkyū-buntansha): 杉本 俊之 山形大学, 大学院理工学研究科, 准教授 (10282237)
• Research Collaborator: NAKAJIMA Takuya ; KAMATA Masafumi
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥15,730,000 (Direct Cost: ¥12,100,000、Indirect Cost: ¥3,630,000); Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2016: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000); Fiscal Year 2015: ¥8,190,000 (Direct Cost: ¥6,300,000、Indirect Cost: ¥1,890,000)
• Keywords: 負コロナ放電 / テーラーコーンの分裂 / 帯電水滴 / 共振振動 / ナノ水滴の生成 / パルス波形の減衰時間 / 細管電極 / 導電率 / 微小水滴 / テーラーコーン / 水滴分裂 / 電流波形 / 負極性コロナ放電 / 減衰定数 / 電荷量 / 水滴 / 脱臭 / コロナ放電 / 帯電微小水滴 / 除湿 / ナノ粒子 / 粒径分布 / 帯電ナノ粒子 / 湿度調整 / 水滴の先鋭化 / コロナ電流パルス / 粒子個数 / 減衰時間

Outline of Final Research Achievements

Corona discharge from a water droplet extruded at a tip of a capillary tube with 0.18mm diameter under a strong dc electric field causes was investigated focusing on the state of a cone formation and disruption, the size of ejected charged droplets and the method for increasing the number of droplets. Possibility of humidity control in room air was confirmed experimentally using charge droplets.
The resonant frequency of droplet vibration due to the cone disruption depends on the droplet volume. The current waveform consists of the largest first pulse by disruption of the cone and successive negative corona pulse trains. The peak value of the first current pulse and charge quantity increase with conductivity of sample water. The decay time of the first current pulse was larger than that of successive corona pulses and depends on the conductivity of sample water. The nanometer-sized charged droplets was could be used to adjust the relative humidity.

Research Products

• [Journal Article] Influence of conductivity on corona discharge current from a water droplet and on ejection of nano-sized droplets. (2017)
  • Author(s): Yoshio Higashiyama. Takuya Nakajima, Toshiyuki Sugimoto
  • Journal Title: Journal Electrostatics Volume: 88 Pages: 65-70
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] 水電極からのコロナ放電を用いた除湿効果 (2017)
  • Author(s): 鎌田修史、東山禎夫
  • Organizer: 電気学会全国大会
  • Place of Presentation: 富山大学
  • Year and Date: 2017-03-15
• [Presentation] 水滴からのコロナ放電により生成される微小水滴の粒径分布 (2017)
  • Author(s): 大河原圭将、鎌田修史、東山禎夫
  • Organizer: 電気学会全国大会
  • Place of Presentation: 富山大学
  • Year and Date: 2017-03-15
• [Presentation] Influence of Conductivity on Corona Discharge Current from a Water Droplet and Ejection of Nanometer-sized Droplets (2017)
  • Author(s): Yoshio Higashiyama Takuya Nakajima Toshiyuki Sugimoto
  • Organizer: Electrostatics 2017
  • Int'l Joint Research
• [Presentation] Dehumidification using Negative corona Discharge from a Water Droplet (2017)
  • Author(s): Yoshio Higashiyama, Masafumi Kamada
  • Organizer: Annual Meeting of Electrostatic Society of America
  • Int'l Joint Research
• [Presentation] 水滴からのコロナ放電による水分除去法の検討 (2016)
  • Author(s): 鎌田修史、東山禎夫
  • Organizer: 静電気学会全国大会
  • Place of Presentation: 群馬大学
  • Year and Date: 2016-09-29
• [Presentation] 0.18mm径細管電極先端の微小水滴からの負極性コロナ放電時の振動特性 (2016)
  • Author(s): 中島拓哉、東山禎夫
  • Organizer: 静電気学会全国大会
  • Place of Presentation: 群馬大学
  • Year and Date: 2016-09-29
• [Presentation] 水電極からのコロナ放電を用いた湿度調整法の検討 (2016)
  • Author(s): 鎌田修史、東山禎夫
  • Organizer: 平成28年度電気学会全国大会
  • Place of Presentation: 東北大学
  • Year and Date: 2016-03-16
• [Presentation] 水滴からの負コロナ放電に及ぼす体積の影響 (2015)
  • Author(s): 中島拓哉、東山禎夫
  • Organizer: 第39回静電気学会全国大会
  • Place of Presentation: 首都大学東京
  • Year and Date: 2015-09-24
• [Presentation] 水滴からの直流負コロナ放電に及ぼす導電率の影響 (2015)
  • Author(s): 中島拓哉、東山禎夫
  • Organizer: 平成27年度電気学会学会東北支部大会：
  • Place of Presentation: 岩手県立大学
  • Year and Date: 2015-08-27