Enhancement of Critical Heat Flux of immiscible mixtures flow boiling in a channel with unheated space

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K04315
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 19020:Thermal engineering-related
• Research Institution: University of Hyogo
• Principal Investigator: Kawanami Osamu 兵庫県立大学, 工学研究科, 教授 (20382260)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 沸騰 / 限界熱流束 / 非共溶性混合媒体

Outline of Final Research Achievements

Flow boiling experiments were conducted using a immiscible mixture by FC-72 and water. The heating test section was a rectangular channel with a channel height of 1-5 mm and a channel width of 73 mm (30 mm wide heated area + 23 mm wide unheated area). The flow ratio of water to FC-72 was varied, and the total flow rate was kept constant at 0.5 L/min. In the case of water:FC-72 = 4:1, the heat transfer coefficient was higher than that of the water-only component over the entire heated area. The CHF, on the other hand, increased as the ratio of water increased, and was highest in the case of the water-only component. FC-72 was found to remain along the unheated area even in the downstream of test section, however did not contribute to the increase in CHF.

Free Research Field

熱工学

Academic Significance and Societal Importance of the Research Achievements

本研究によって、非共溶性混合媒体を用いた沸騰伝熱の基礎的知見が多く得られた。これらは、既往の熱交換器や電子機器の冷却システムに対して、極めて効率良い、新たな冷却方法として重要な知見となるため、例えばデータセンターの省エネ化に貢献できるなど社会的意義が大きいものである。また、非共溶性混合媒体による流動沸騰実験による限界熱流束データや熱伝達データは、これまでにほとんど例がなく、学術的に大きな価値があるものである。