| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
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| Outline of Final Research Achievements |
Pool nucleate boiling heat transfer experiments were performed by using a 10×10 mm heat transfer surface made of a coper print circuit board at 0.1 MPa. Three-phase contact line was not observed at the critical heat flux condition in the purified water experiments. Small dried area came out, it gradually grew oscillatory expanding and shrinking and finally the heat transfer surface physically burned out. The critical heat flux was enhanced approximately 50 % in the nano-fluid experiments than in the purified water experiments although the boiling heat transfer coefficient was deteriorated. The dry area that appeared at the critical heat flux condition in the case of nano-fluid was smaller than that in the case of purified water. The heat transfer surface was covered with deposited nano-particles. It was considered that the deposited nano-particle layer suppressed the spreading of the dried area, which resulted in the enhancement of the critical heat flux in the nano-fluid.
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