21802 脈動流下および振動下のサブクール流動沸騰熱伝達に関する実験的研究(明日に向けた熱と物質移動の新展開(1),OS.6 明日に向けた熱と物質移動の新展開)

Abstract

Onset of nucleate boiling -ONB- and critical heat flux -CHF- on subcooled flow boiling under oscillatory flow and vibration conditions, focusing on liquid velocity, amplitude and frequency of oscillations were investigated experimentally. Experiments were conducted. using a copper thin-film and subcooled water in a range of the liquid velocity from 0.27 to 4.07m/s at 0.10MPa. The liquid subcooling was 20K. Frequency of oscillatory flow was 2, 4 and 6Hz, respectively; amplitude of oscillatory flow was 25 and 50% in a ratio of main flow rate, respectively. For the vibration condition, acceleration of vibrator was 1.3 and 4.2m/s2, respectively. Temperature at ONB and critical heat flux for oscillatory flow were lower than those for steady flow. The decreasing of liquid velocity by oscillatory caused the ONB and the CHF to decrease. The effects of liquid oscillatory flow on the incipient boiling temperature were examined through a classical stability theory of preexisting nuclei. Critical heat flux for the vibration condition was higher than that for steady flow. Coalesced bubble on a heater was frequently released by the vibration of a test section.