Study to clarify mechanism behind heat transfer enhancement in reactor due to RISA

• Project/Area Number: 23360425
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Nuclear engineering
• Research Institution: Tokyo University of Marine Science and Technology
• Principal Investigator: HAZUKU Tatsuya 東京海洋大学, 海洋科学技術研究科, 准教授 (60334554)
• Co-Investigator(Kenkyū-buntansha): TAKAMASA Tomoji 東京海洋大学, 海洋科学技術研究科, 教授 (20134851)
• Research Collaborator: HIBIKI Takashi 米国パデュー大学, 原子力工学科, 教授
• Project Period (FY): 2011-04-01 – 2014-03-31
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥18,200,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥4,200,000); Fiscal Year 2013: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2012: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000); Fiscal Year 2011: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
• Keywords: 放射線誘起表面活性 / 濡れ性 / 沸騰伝熱 / 伝熱向上 / 軽水炉 / ドライアウト

Research Abstract

The final goal of this study is to clarify the mechanism behind enhancements of wall surface wettability and boiling heat transfer due to the radiation induced surface activation (RISA) under high-temperature and high-pressure conditions equivalent to thermal environment in a core of light water reactor. Detailed discussions about dynamic wettability at ambient temperatures up to 250 degrees centigrade were made based on the experimental data. The results showed that the advancing contact angles were decreased due to gamma-ray irradiation at all conditions tested and revealed that the dynamic wettability was enhanced due to the RISA even under high-temperature and high-pressure conditions.
In order to evaluate the effect of surface wettability on liquid film dryout in annular-mist flow, the flow characteristics of liquid film and droplets near the condition in which the liquid film dryout occurs were also observed in detail using two-test pipes with different surface wettability.

Research Products

• [Journal Article] Effect of Wall Wettability on Flow Characteristics of Annular Two-phase Flow (2013)
  • Author(s): Tatsuya HAZUKU, Akihiko KAMURA, Tomoji TAKAMASA
  • Journal Title: Multiphase Science and Technology Volume: Vol. 24-3 Issue: 3 Pages: 223-237
  • DOI: 10.1615/multscientechn.v24.i3.30
  • Peer Reviewed
• [Journal Article] Experimental Study on Annular Two-phase Flow Affected by Pipe Wall Wettability (2013)
  • Author(s): Ryoji MATSUE, Tatsuya HAZUKU, Yutaka FUKUHARA, Tomoji TAKAMASA
  • Journal Title: Proc. 8th International Conference on Multiphase Flow
  • Peer Reviewed
• [Presentation] 高温下における液体の動的接触角 (2013)
  • Author(s): 武翔太
  • Organizer: 日本原子力学会2013年秋の大会
  • Place of Presentation: 八戸工業大学
  • Year and Date: 2013-09-05
• [Presentation] Experimental Study on Annular Two-phase Flow Affected by Pipe Wall Wettability (2013)
  • Author(s): Ryoji MATSUE
  • Organizer: 8th International Conference on Multiphase Flow (ICMF 2013)
  • Place of Presentation: Jeju, Korea
  • Year and Date: 2013-05-28
• [Presentation] Effect of Wall Wettability on Flow Characteristics of Annular Two-phase Flow (2012)
  • Author(s): Tatsuya HAZUKU
  • Organizer: 6th Japanese-European Two-Phase Flow Group Meeting
  • Place of Presentation: KKR ホテル熊本
  • Year and Date: 2012-09-24
• [Presentation] 高温下における液滴接触角の測定 (2012)
  • Author(s): 波津久達也
  • Organizer: 日本混相流学会年会講演会2012
  • Place of Presentation: 東京大学柏キャンパス
  • Year and Date: 2012-08-09
• [Presentation] Effect of Wall Wettability on Flow Characteristics of Annular Two-phase Flow (2012)
  • Author(s): 波津久達也
  • Organizer: 6th Japanese-European Two-Phase Flow Group Meeting 2012
  • Place of Presentation: KKRホテル熊本
• [Presentation] 環状噴霧流の液滴飛散と液膜ドライアウトに及ぼす壁面濡れ性の影響 (2011)
  • Author(s): 下村祐介
  • Organizer: 日本混相流学会年会講演会2011
  • Place of Presentation: 京都工芸繊維大学松ヶ崎キャンパス
  • Year and Date: 2011-08-06
• [Presentation] 環状噴霧流の液滴飛散と液膜ドライアウトに及ぼす壁面濡れ性の影響 (2011)
  • Author(s): 下村祐介
  • Organizer: 日本混相流学会年会講演会2011
  • Place of Presentation: 京都工芸繊維大学