Study on droplet motion induced by evaporation of neighboring droplets and related deposition patterns

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K14910
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 19020:Thermal engineering-related
• Research Institution: Okayama University
• Principal Investigator: Yamada Yutaka 岡山大学, 自然科学研究科, 講師 (60758481)
• Project Period (FY): 2019-04-01 – 2021-03-31
• Keywords: 液滴蒸発 / 液滴内流れ

Outline of Final Research Achievements

In the present study, one or two droplets evaporation was experimentally investigated to understand the detail behavior of evaporation. The evaporation mode such as constant contact radius, constant contact angle and mixed mode were observed in the evaporation of milti-droplets while the transition time between each mode from deposition was elongated. The time for complete evaporation was elongated about 30% when two droplets center were separated within 2.5 mm. On the other hand, evaporation time becomes comparable when the separation was about 7.0 mm. In addition, the visualization experiment in the flow of two droplet revealed that the liquid flow directed to the far side of three-phase contact line along the liquid-gas interface was observed.

Free Research Field

熱工学

Academic Significance and Societal Importance of the Research Achievements

本研究で注目した液滴蒸発は熱伝導の素過程として様々な工業プロセスで見られる現象である．特に，複数液滴の系は実環境では多くみられるものであるにも関わらず，研究の進んでいない領域であった．そのため，ここで得られた成果は2液滴のみならず，さらに多くの液滴が近接して存在する環境における蒸発現象や，蒸発によって誘起される液滴内の流れを理解するために重要である．また，工業的に応用されているスプレー冷却の効率的な運用やインクジェット印刷における物質堆積の理解などに役立つと考えられる．