Wetting dynamics coupling with liquid-vapor phase change and surface oxidation at high temperature

• Project/Area Number: 16H02315
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Thermal engineering
• Research Institution: Kyushu University
• Principal Investigator: TAKATA Yasuyuki 九州大学, 工学研究院, 教授 (70171444)
• Co-Investigator(Kenkyū-buntansha): 高橋 厚史 九州大学, 工学研究院, 教授 (10243924) ; 河野 正道 九州大学, 工学研究院, 教授 (50311634)
• Research Collaborator: Sefiane Khellil エディンバラ大学, 教授 ; Kim Jungho メリーランド大学, 教授
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥45,760,000 (Direct Cost: ¥35,200,000、Indirect Cost: ¥10,560,000); Fiscal Year 2018: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000); Fiscal Year 2017: ¥11,180,000 (Direct Cost: ¥8,600,000、Indirect Cost: ¥2,580,000); Fiscal Year 2016: ¥26,650,000 (Direct Cost: ¥20,500,000、Indirect Cost: ¥6,150,000)
• Keywords: 伝熱機器 / 液滴 / 酸化被膜 / 熱物性 / 熱伝達 / 噴霧冷却 / 濡れ性 / 熱工学 / 相変化 / 表面・界面物性

Outline of Final Research Achievements

The objective of the present study is to make clear a mechanism of solid-liquid direct contact at high temperature for spray cooling process taking the effect of oxide layer of metal surface into account. We mainly conducted (1) observation of solid-liquid contact and dynamic wetting, and (2) evaluation of the effect of oxide layer by making use of transient heat conduction model. We analyzed the experimental data for the temperature at quenching point using thermal diffusivity, specific heat and density of oxide layer and found that the interface temperature at quenching point is 250C in all experiments with different oxide layers.

Academic Significance and Societal Importance of the Research Achievements

液体の相変化を利用した高温面の冷却は鉄鋼業における冷却プロセスなど工学の基盤技術である．これまで水による高温面の冷却過程において急速冷却を開始する，いわゆるクエンチ点における高温面の温度は300～600℃の範囲に分散し，統一的な理解ができなかった．600℃という高温は液体が熱力学的過熱限界温度(約320℃)をはるかに超え，この状態で水が液体で存在できるはずがないというのが学界における否定的な意見であった．本研究で，酸化被膜の影響を考慮した上で非定常熱伝導モデル固液界面温度を推定したところ，その値は約250℃となることが分かった．これはこれまでの論争に決着をつけることができる研究成果である．

Research Products

• [Int'l Joint Research] Gadjah Mada University(インドネシア)
• [Int'l Joint Research] Indian Institute of Technology, Madras(インド)
• [Int'l Joint Research] The University of Edinburgh(英国)
• [Int'l Joint Research] University of Edinburgh(英国)
• [Int'l Joint Research] University of Edinburgh(英国)
• [Int'l Joint Research] University of Maryland(米国)
• [Int'l Joint Research] Gadjah Mada University(インドネシア)
• [Journal Article] The interfacial dynamics of the micrometric droplet diameters during the impacting onto inclined hot surfaces (2018)
  • Author(s): Deendarlianto、Takata Yasuyuki、Widyatama Arif、Majid Akmal Irfan、Wiranata Ardi、Widyaparaga Adhika、Kohno Masamichi、Hidaka Sumitomo、Indarto
  • Journal Title: International Journal of Heat and Mass Transfer Volume: 126 Pages: 39-51
  • DOI: 10.1016/j.ijheatmasstransfer.2018.05.023
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Evaporation kinetics of pure water drops: Thermal patterns, Marangoni flow, and interfacial temperature difference (2018)
  • Author(s): Josyula Tejaswi、Wang Zhenying、Askounis Alexandros、Orejon Daniel、Harish Sivasankaran、Takata Yasuyuki、Mahapatra Pallab Sinha、Pattamatta Arvind
  • Journal Title: Physical Review E Volume: 98 Issue: 5 Pages: 052804-052804
  • DOI: 10.1103/physreve.98.052804
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Influence of Local Heating on Marangoni Flows and Evaporation Kinetics of Pure Water Drops (2017)
  • Author(s): Askounis, A., Kita, Y., Kohno, M., Takata, Y., Koutsos, V. & Sefiane, K.
  • Journal Title: Langmuir Volume: 33 Issue: 23 Pages: 5666-5674
  • DOI: 10.1021/acs.langmuir.7b00957
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The effects of the surface roughness on the dynamic behavior of the successive micrometric droplets impacting onto inclined hot surfaces (2017)
  • Author(s): Deendarlianto, Y. Takata, M. Kohno, S. Hidaka, T. Wakui, A. I. Majid, H. Y. KuIndarto and A. Widyaparaga
  • Journal Title: International Journal of Heat and Mass Transfer Volume: 101 Pages: 1217-1226
  • DOI: 10.1016/j.ijheatmasstransfer.2016.05.132
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Induction of Marangoni convection in pure water drops (2016)
  • Author(s): Yutaku Kita, Alexandros Askounis, Masamichi Kohno, Yasuyuki Takata,Jungho Kim,Khellil Sefiane
  • Journal Title: Applied Physics Letters Volume: 109 Issue: 17 Pages: 171602-171602
  • DOI: 10.1063/1.4966542
  • Peer Reviewed / Int'l Joint Research
• [Presentation] 酸化被膜を表面に溶射した高温面に衝突する単一液滴の挙動観察 (2018)
  • Author(s): 塚本健吾，日高澄具，福田啓之，高田保之
  • Organizer: 日本機械学会熱工学コンファレンス2018
• [Book] Boiling: Research and advances (2017)
  • Author(s): Yasuo Koizumi, Masahiro Shoji, Masanori Monde, Yasuyuki Takata, Niro Nagai
  • Total Pages: 801
  • Publisher: Elsevier
  • ISBN: 9780081010105