2021 Fiscal Year Final Research Report
Relaxation of intramolecular vibration generated by continuous infrared radiation at the gas-liquid interface and effective absorption band for solvent drying
| Project/Area Number |
19H02074
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 19020:Thermal engineering-related
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
小林 一道 北海道大学, 工学研究院, 准教授 (80453140)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 振動緩和 / 蒸発 / 赤外線 / 溶剤 |
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| 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.
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| Free Research Field |
熱工学
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| 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。
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