Pressure fluctuations preceding critical heat flux during subcooled flow boiling in a one-side heated mini-channel under rolling motion

초록

This study investigates effects of rolling motion on pressure fluctuations leading to Critical Heat Flux (CHF) during subcooled flow boiling in a mini-channel. Experiments were conducted at rolling amplitudes of 15 degrees and 25 degrees and periods of 10 and 30 s under two mass flow rates. Results obtained in static and rolling cases were compared. The rolling case showed higher pressure fluctuations, leading to higher CHF values, compared to the static case. The rolling intensity was the highest in the case with a higher amplitude and a shorter rolling period, whereas it was the lowest in the case with a lower amplitude and a longer rolling period. Correspondingly, the pressure fluctuations and CHF followed a similar trend, with the highest values observed in the case with the highest rolling intensity. The pressure fluctuations in the rolling experiments were also found to increase with increasing power, particularly at high heat flux values.

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