Experimental study on a two-phase critical flow with a non-condensable gas at high pressure conditions |
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Authors: | Hyun-Sik Park Nam-Hyun ChoiSeok-Kyu Chang Chang-Hwan ChungSung-Jae Yi Choon-Kyung ParkMoon-Ki Chung |
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Institution: | Thermal Hydraulics Safety Research Center, Korea Atomic Energy Research Institute, 1045 Daedeokdaero, Yuseong, Daejeon, 305-600, Republic of Korea |
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Abstract: | An experimental study was performed on a two-phase critical flow with a non-condensable gas at high pressure conditions. Experimental data for the critical flow rates were generated by using sharp-edged stainless steel pipes with an inner diameter of 10.9 mm, a thickness of 3.2 mm, and a length of 1000 mm. The test conditions were varied by using the stagnation pressures of 4.0, 7.0, and 10.0 MPa, water subcoolings of 0.0, 20.0, and 50.0 °C, and nitrogen gas flow rates of 0.0–0.22 kg/s. The experimental results show that the critical mass flux decreases rapidly with an increase of the volumetric non-condensable gas fraction. Also the critical mass flux increases with an increase of the stagnation pressure and a decrease of the stagnation temperature. An empirical correlation of the non-dimensional critical mass flux, which is expressed as an exponential function of the non-condensable gas fraction of the volumetric flow, is obtained from the experimental data. |
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Keywords: | Two-phase flow Critical flow Non-condensable gas High pressure |
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