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Relaxation of intramolecular vibration generated by continuous infrared radiation at the gas-liquid interface and effective absorption band for solvent drying

Research Project

Project/Area Number 19H02074
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 19020:Thermal engineering-related
Research InstitutionHokkaido University

Principal Investigator

Totani Tsuyoshi  北海道大学, 工学研究院, 教授 (00301937)

Co-Investigator(Kenkyū-buntansha) 小林 一道  北海道大学, 工学研究院, 准教授 (80453140)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2021: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2020: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2019: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000)
Keywords振動緩和 / 蒸発 / 赤外線 / 溶剤 / 分子内振動の緩和 / 溶剤の赤外線吸収帯 / 溶剤乾燥 / 赤外線連続照射 / 気液界面 / 赤外線吸収 / 波長 / 乾燥 / 界面
Outline of Research at the Start

本研究では、溶剤が吸収する赤外線を気液界面の溶剤分子に連続照射して分子内振動を励起し、分子内振動が分子間振動へ変換(緩和)される挙動を、赤外線照射実験により明らかにする。さらに、得られた緩和挙動を組み込んだ分子動力学解析と分子動力学解析によって得られた境界条件を用いたボルツマン方程式解析と、溶剤の乾燥実験によって、溶剤の蒸発量を求め、溶剤乾燥に効果的な溶剤の赤外線吸収帯を溶剤(水、IPA、トルエン)ごとに解明する。また、解析結果と実験結果を比較し、分子内振動の励起・緩和が溶剤乾燥に及ぼす効果を定量的に明らかにする。

Outline of Final Research Achievements

In this study, (1) the relaxation behavior of a solvent when continuously irradiated with infrared light at the absorption wavelength of the solvent and (2) the evaporation behavior of the solvent by molecular dynamics and Boltzmann equation analysis were investigated.
In (1), it was found that continuous irradiation of infrared light, which causes angular vibration of water, may accelerate evaporation by about 5% compared to heating by thermal conduction in the wavelength range of bound rotational vibration, which is involved in water evaporation. In (2), It was found that for evaporating molecules by local heating, the normal direction temperature is almost equal to the local heating temperature, and the tangential direction temperature is anisotropic taking a temperature close to that of the bulk liquid in the non-heated state. Further, the larger the number of non-condensable gases in the gas, the more isotropic the distribution becomes due to molecular collisions.

Academic Significance and Societal Importance of the Research Achievements

本研究では、(1)溶剤の吸収波長に赤外線を連続照射した時の緩和挙動の把握と(2)分子動力学法とボルツマン方程式解析による溶剤の蒸発挙動の把握を行った。
(1)で得られた成果は、乾燥の分野で望まれている可燃性溶剤の着火、被加熱物の熱変性や製品の変形を防ぐために、低温空間(炉内の温度を低く保つ)での乾燥の実現につながる意義を持つ。(2)で得られた成果は、気液界面の分子を局所加熱することによって、蒸発を促進できることを示しており、溶剤の分子内振動を励起し、分子間振動を緩和させて乾燥させる本乾燥方式のメカニズム解明の基礎的知見となる。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (11 results)

All 2022 2020 2019 Other

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (8 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results) Remarks (2 results)

  • [Journal Article] Molecular dynamics study of evaporation induced locally heated argon liquid2022

    • Author(s)
      Hirofumi Tabe, Kiryu Hiramatsu, Kazumichi Kobayashi, Hiroyuki Fujii, Masao Watanabe, Tsuyoshi Totani
    • Journal Title

      Applied Thermal Engineering

      Volume: Accept

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 連続励起された水の分子内振動から分子間振動への緩和2022

    • Author(s)
      棚田慶崇,戸谷 剛,小林一道,近藤良夫
    • Organizer
      日本機械学会北海道学生会第51回学生員卒業研究発表講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 連続励起された水の分子内振動から分子間振動への緩和2022

    • Author(s)
      棚田慶崇,戸谷 剛,小林一道,近藤良夫
    • Organizer
      第59回日本伝熱シンポジウム
    • Related Report
      2021 Annual Research Report
  • [Presentation] 局所加熱アルゴン液体の蒸発現象に関する分子動力学計算2020

    • Author(s)
      平松希隆,田部広風海,小林一道,藤井宏之,渡部正夫,大島伸行,近藤良夫,戸谷 剛
    • Organizer
      第34回数値流体力学シンポジウム
    • Related Report
      2020 Annual Research Report
  • [Presentation] Infrared ray drying by emitting to the absorption band of solvents2019

    • Author(s)
      Tsuyoshi Totani, Atsushi Sakurai, Tadaaki Nagao, Yoshio Kondo
    • Organizer
      The 1st Asia-Pacific Thermofluid Science & Engineering Conference
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Increase of drying rate by wavelength-selective emitter with metamaterial structures in infrared ray drying2019

    • Author(s)
      Tsuyoshi Totani, Atsushi Sakurai, Tadaaki Nagao, Yoshio Kondo
    • Organizer
      The 2nd Pacific Rim Thermal Engineering Conference
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 気液界面への赤外線照射による水の蒸発流れの数値計算2019

    • Author(s)
      平松希隆,田部広風海,小林一道,渡部正夫,藤井宏之,戸谷剛
    • Organizer
      日本機械学会流体工学部門、第97回講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 非凝縮性気体分子が蒸気分子の蒸発に及ぼす影響に関する分子気体力学解析2019

    • Author(s)
      伊藤洋輔,小林一道,渡部正夫,藤井宏之,戸谷剛
    • Organizer
      日本機械学会流体工学部門、第97回講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 蒸気と非凝縮性気体の混合気体に接した液体の蒸発に関する分子気体力学シミュレーション2019

    • Author(s)
      伊藤洋輔 ,小林 一道,藤井 宏之,渡部 正夫,戸谷剛
    • Organizer
      混相流シンポジウム
    • Related Report
      2019 Annual Research Report
  • [Remarks] マイクロエネルギーシステム研究室ホームページ

    • URL

      https://labs.eng.hokudai.ac.jp/labo/mes/

    • Related Report
      2019 Annual Research Report
  • [Remarks] 熱流体物理学研究室ホームページ

    • URL

      https://labs.eng.hokudai.ac.jp/labo/fluid/

    • Related Report
      2019 Annual Research Report

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Published: 2019-04-18   Modified: 2023-01-30  

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