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2020 年度 実績報告書

固体ナノ細孔における気泡発生の解析と制御に関する研究

研究課題

研究課題/領域番号 20J22422
研究機関東京大学

研究代表者

PAUL SOUMYADEEP  東京大学, 工学系研究科, 特別研究員(DC1)

研究期間 (年度) 2020-04-24 – 2023-03-31
キーワードJoule heating / nanopore / bubble nucleation / microelectronic cooling
研究実績の概要

Control over nanobubble size and generation periodicity is key to realizing a bubble seed emitter for micro-electronic cooling applications. In the past year, the effects of changing nanopore diameter and bias voltages were studied on bubble size and periodicity. Bubble nucleation is actuated inside a solid state nanopore through localized Joule heating. As a bubble nucleates and grows at this hotspot to block the pore, we record transient current dips using a high bandwidth oscilloscope. A signal processing software was developed to analyze the bubble blockage events. Additionally, three theoretical models were constructed: (i) a continuum Joule heating model for nanopore temperature estimation, (ii) a 1D moving boundary model to capture bubble growth and collapse and (iii) a cluster competition model to explain the transition between nucleation modes. Our analysis indicates that as the pore diameter is increased, periodic and homogenous nucleation at the pore center transitions into predominantly heterogeneous nucleation on the pore walls, making the bubble generation stochastic. Also, with an increase in pore diameter, larger homogenous bubbles were generated. These results were summarized into two journal publications (Paul et al., Phys. Rev. Res. 2, 043400 (2020) and Paul et al., JTST 16, JTST0007 (2021)) and presented at two online conferences (57th NHTS (2020) and 73rd APS DFD meeting (2020)).

現在までの達成度 (区分)
現在までの達成度 (区分)

1: 当初の計画以上に進展している

理由

Our target for the first year was to understand the influence of pore diameter on periodic and non-periodic bubble generation in nanopores. Our investigation led us to the finding that transition between homogeneous and heterogeneous nucleation is responsible for the different bubble generation modes observed. This finding and the underlying analyses were well received by the thermal engineering and applied physics community, according to the response from conference audience and journal reviewers. Thus we reach the assessment of "above-expectation progress".

今後の研究の推進方策

In the following year, we plan to perform acoustic measurements of bubble dynamics using piezo-electric type hydrophones. In addition, we are working on
developing an optical thermometry experimental setup to measure superheat temperatures inside nanopore, caused as a result of Joule heating. Also, to better analyze the bubble signal data, we are working on adding a machine learning based binary classifier to our signal processing software for clear differentiation between homogeneous and heterogeneous bubbles.

  • 研究成果

    (5件)

すべて 2021 2020 その他

すべて 国際共同研究 (1件) 雑誌論文 (2件) (うち国際共著 2件、 査読あり 2件、 オープンアクセス 2件) 学会発表 (2件) (うち国際学会 1件)

  • [国際共同研究] Imperial College London/The Alan Turing Institute/University of Nottingham(英国)

    • 国名
      英国
    • 外国機関名
      Imperial College London/The Alan Turing Institute/University of Nottingham
  • [雑誌論文] Analysis and control of vapor bubble growth inside solid-state nanopores2021

    • 著者名/発表者名
      PAUL Soumyadeep、HSU Wei-Lun、MAGNINI Mirco、MASON Lachlan R.、ITO Yusuke、HO Ya-Lun、MATAR Omar K.、DAIGUJI Hirofumi
    • 雑誌名

      Journal of Thermal Science and Technology

      巻: 16 ページ: JTST0007

    • DOI

      10.1299/jtst.2021jtst0007

    • 査読あり / オープンアクセス / 国際共著
  • [雑誌論文] Single-bubble dynamics in nanopores: Transition between homogeneous and heterogeneous nucleation2020

    • 著者名/発表者名
      Paul Soumyadeep、Hsu Wei-Lun、Magnini Mirco、Mason Lachlan R.、Ho Ya-Lun、Matar Omar K.、Daiguji Hirofumi
    • 雑誌名

      Physical Review Research

      巻: 2 ページ: 043400

    • DOI

      10.1103/PhysRevResearch.2.043400

    • 査読あり / オープンアクセス / 国際共著
  • [学会発表] A Study of Homogeneous and Heterogeneous Bubble Nucleation Inside Nanopores through Resistive Pulse Sensing2020

    • 著者名/発表者名
      Soumyadeep Paul, Wei-Lun Hsu, Mirco Magnini, Lachlan R. Mason, Ya-Lun Ho, Omar K. Matar and Hirofumi Daiguji
    • 学会等名
      73rd Annual Meeting of the APS Division of Fluid Dynamics
    • 国際学会
  • [学会発表] Resistive pulse sensing of bubble generation inside solid-state nanopores2020

    • 著者名/発表者名
      Soumyadeep Paul, Wei-Lun Hsu, Ya-Lun Ho and Hirofumi Daiguji
    • 学会等名
      57th National Heat Transfer Symposium

URL: 

公開日: 2021-12-27  

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