Assessment of level swell measurements in the OSU APEX Test Facility Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/41687k50v

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  • The purposes of this paper are to present the results of an experimental effort to measure the level swell in an air/water system and to generate a methodology for determining the volume-averaged void fraction within the Oregon State University (OSU) Advanced Plant Experiment (APEX) Test Facility. The results were then compared with existing void fraction correlations for assessment. The air/water system consisted of a vertical, cylindrical, transparent test section having an inner diameter of 15.2 cm. It includes a lower plenum-mixing chamber with separate air and water inlets. The parameters measured included air flow rate, collapsed liquid level, level swell and local void fraction. The collapsed liquid level was measured using a differential pressure cell. The fluid mixture level was measured using a fixed scale for visual indication and a state-of-the-art capacitance probe, the Drexelbrook Level Transmitter™. The data obtained using the advanced instrumentation showed good agreement with visual observations and the Kataoka and Ishii (Ref.(5)) pool boiling correlation for level swell. For the OSU APEX Test Facility, two Nuclear Regulatory Commission (NRC) sponsored tests were selected for assessment. Void fractions were measured from the instrumentation data and compared with the predicted void fractions from both the Kataoka and Ishii (Ref.(5)) and Chexal and Lellouche (Ref.(2)) correlations. The comparisons were within the accuracy range and matched the experimental trends well. To benchmark the methodology process against higher-pressure data, a test series from the Oak Ridge National Laboratory (ORNL) Thermal Hydraulic Test Facility (THTF) was evaluated using the same methodology. Results were in excellent agreement with their previously published data.
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