Study on boiling heat transfer of subcooled flow under oscillatory flow condition

The onset of nucleate boiling, the point of net vapor generation and critical heat flux on subcooled flow boiling, under oscillatoryflow focusing on liquid velocity, amplitude and frequency of oscilations were investigated experimentally and analytically. Experiments were conducted using a copper thin-film and subcooled water in a range of the liquid velocity from 0.27 to 4.07 m/s at 0.10MPa. The liquid subcooling was 20K. Frequency of oscillatory flow was 2 and 4 Hz, refpecpively; Amplitude of oscillatory flow was 25 and 50% in a ratio of main flow rate refpecpively. Temperatures at the Onset of Nucleate Boiling and Critical Heat Flux obtained in the experiments decrease with the oscillatory flow. The decrease of liquid velocity by oscillatory caused ONB and CHF to decrease.