Experimental investigations on flashing-induced instabilities in one and two-parallel channels: A comparative study. Marcel, C., P., Rohde, M., & Van Der Hagen, T., H. Experimental Thermal and Fluid Science, 34(7):879-892, 2010.
abstract   bibtex   
In this investigation, experiments conducted in a natural circulation test facility at low power and low pressure conditions, in the one single and two-parallel channels configuration are presented and discussed in detail. The novel manner of visualizing the results allowed characterizing the facility at any time and position which helped to thoroughly understand the instability mechanisms. Different modes were observed for each configuration. In the case of having two-parallel channels, four different behaviors have been observed: stable flow circulation, periodic high subcooling oscillations, a-periodical oscillations and out-of-phase periodical oscillations. In addition, stability maps were constructed in order to clarify the region in which each mode is dominant. The results obtained from both the one and two-parallel channels configurations are thus analyzed and compared. As a result, some similarities have been observed between the intermittent flow oscillations found in the single channel experiments and the high subcooling oscillations found in the two-parallel channels experiments. Moreover, similarities have also been found between the sinusoidal flow oscillations existing in the single channel experiments and the out-of-phase oscillations from the two-parallel channels experiments. The experiments presented in this work can be used to benchmark numerical codes and modeling techniques developed to study the start-up of natural circulation BWRs. © 2010 Elsevier Inc. All rights reserved.
@article{
 title = {Experimental investigations on flashing-induced instabilities in one and two-parallel channels: A comparative study},
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 year = {2010},
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 keywords = {Flashing-induced instabilities,Natural circulation,Parallel channels},
 pages = {879-892},
 volume = {34},
 city = {Delft Univ Technol TUDelft, Dept Phys Nucl Reactors, NL-2629 JB Delft, Netherlands},
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 abstract = {In this investigation, experiments conducted in a natural circulation test facility at low power and low pressure conditions, in the one single and two-parallel channels configuration are presented and discussed in detail. The novel manner of visualizing the results allowed characterizing the facility at any time and position which helped to thoroughly understand the instability mechanisms. Different modes were observed for each configuration. In the case of having two-parallel channels, four different behaviors have been observed: stable flow circulation, periodic high subcooling oscillations, a-periodical oscillations and out-of-phase periodical oscillations. In addition, stability maps were constructed in order to clarify the region in which each mode is dominant. The results obtained from both the one and two-parallel channels configurations are thus analyzed and compared. As a result, some similarities have been observed between the intermittent flow oscillations found in the single channel experiments and the high subcooling oscillations found in the two-parallel channels experiments. Moreover, similarities have also been found between the sinusoidal flow oscillations existing in the single channel experiments and the out-of-phase oscillations from the two-parallel channels experiments. The experiments presented in this work can be used to benchmark numerical codes and modeling techniques developed to study the start-up of natural circulation BWRs. © 2010 Elsevier Inc. All rights reserved.},
 bibtype = {article},
 author = {Marcel, Christian P. and Rohde, M. and Van Der Hagen, T. H.J.J.},
 journal = {Experimental Thermal and Fluid Science},
 number = {7}
}

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