The Effects of Non-Condensible Gas on the Critical Pressure Ratio and Critical Flow Rate in a Safety Valve
نویسنده
چکیده
The effect of non-condensible gas on subcooled water critical flow phenomena in a safety valve is investigated experimentally at various subcoolings and disk lifts. In the experiment, the flow rate of non-condensible gas is controlled between 0 to 2 m/hr about 11 bar after the subcooled water critical condition is established at the throat of a safety valve. The critical pressure ratio with non-condensible gas is increased within 5% variation of that without non-condensible gas while its increase is little affected by non-condensible gas fraction. The subcooled water critical flowrate shows a decreasing trend as the void fraction is increased and its value is about 90% of the subcooled water critical flow rate without non-condensible gas when the gas fraction reaches 40%.
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