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- W2000883826 abstract "For the prediction of dryout in fuel elements of boiling water reactors, the dynamic behavior of the water film covering the fuel rod has to be understood. This paper provides high resolved experimental data of the liquid film and gives insight into the dynamic film behavior. The experiments of this work were conducted in a vertical channel representing a pair of neighboring subchannels of a BWR fuel rod bundle. Air and water at ambient pressure and temperature are used as model fluids, creating an annular flow in the test section. The influence of different functional spacer shapes on the liquid film has been studied. The heart of the instrumentation is a liquid film sensor (LFS), which measures the film thickness distribution around a half cylinder with a matrix of 64 × 16 measuring points with a time resolution of 10,000 frames per second and a spatial resolution of 2 mm × 2 mm. The high resolution allows for a visualization of the dynamic liquid film as a movie animation. Principals of the dynamic behavior of the liquid film are observed. The time-averaged film thickness distributions show that the spacers structure the liquid film significantly. The gaseous phase is accelerated due to the cross-section blockage caused by the spacer. This leads to a local thinning of the liquid film downstream of the spacer. Two statistical evaluation methods are presented to determine different dynamic wave properties: The wave velocity as function of the wave height, the traveling path of the waves and the location of wave separation and merge events. The first evaluation method shows that big waves move generally faster than small waves. The analysis further shows wave acceleration in close proximity of the spacer with subsequent deceleration further downstream. Analyzing the wave as a two-dimensional entity it can be seen that the wave paths are clearly structured by the spacer and hence do not travel circumferentially around the fuel rod. Wave separation and merge has a higher occurrence probability in the subchannel gap, if there is no spacer present. With spacer the merge and separation locations are only found along the main flow paths of the waves." @default.
- W2000883826 created "2016-06-24" @default.
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- W2000883826 date "2010-10-01" @default.
- W2000883826 modified "2023-09-29" @default.
- W2000883826 title "Experimental studies of the effect of functional spacers to annular flow in subchannels of a BWR fuel element" @default.
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- W2000883826 doi "https://doi.org/10.1016/j.nucengdes.2010.05.032" @default.
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