B212 地震振動が冷却限界および沸騰気泡挙動へ及ぼす影響に関する研究(OS8 熱流動),動力エネルギーシステム部門20周年,次の20年への新展開)

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Critical heat flux -CHF- on subcooled flow boiling under vibration conditions, focusing on liquid velocity, acceleration and frequency of vibrations was investigated experimentally. Experiments were conducted using a copper thin-film and subcooled water in a range of the liquid velocity from 0.3 to 4.1 m/s at 0.10MPa. The liquid subcooling was 20K. The acceleration was 0.4, 1.3 and 4.15 m/s^2, respectively; the frequency was 2, 4 and 20 Hz, respectively. The present experimental results showed that critical heat fluxes under the vibration conditions of both vibration directions, i.e., horizontal and vertical vibrations to the heater, were higher than those for steady flow. According to present observations, coalesced bubble on the heater was frequently released by vibration of the test heater: the characteristic length of coalesced bubble decreased. This behavior causes the CHF to become higher under the vibration condition. Some experiments were demonstrated under vibration condition of seismic shock wave. It was confirmed that thermal limit of heater was a conservative evaluation during earthquake.
2010-06-20