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Development of Local Droplet Conductivity Probe and Signal Processing Scheme

Author
Toptan, Aysenur
Published
[University Park, Pennsylvania] : Pennsylvania State University, 2015.
Physical Description
1 electronic document
Additional Creators
Kim, Seungjin
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Graduate Program
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Open Access.
Summary
Accurate measurement of liquid droplets in a two-phase flow is of considerable importance for nuclear safety. In the nuclear systems, the dryout is one of the safety design limits. The ability of droplet measurements allows prediction of the dryout and post-dryout heat flux in the system. Also, the effectiveness of the emergency core cooling systems can be enhanced by accurate measurements, which is important for the structure integrity in light water reactors. However, there is a need for very much detailed understanding of droplets in two-phase flows.The motivation of the present study originated from the necessity of the development of a local droplet conductivity probe to measure local time-averaged droplet fraction and to investigate the feasibility of estimating droplet sizes and interfacial area concentration using the information acquired by the probe. To calculate important two-phase flow parameters, a signal processing scheme is developed to process the signals acquired by the newly developed probe. Experiments are performed in air-water droplet two-phase flow to assess the feasibility of the measurement technique. In parallel to experimental investigations, a numerical study is performed to assess the feasibility of the probe. The feasibility of estimating the interfacial area concentration based on estimated mean droplet diameters is assessed in the numerical study. Lastly, the benchmark experiments are performed by employing an optical measurement technique, VisiSize Particle Imaging System. The experiments validated the measurement principle of the developed probe.
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Dissertation Note
M.S. Pennsylvania State University 2015.
Reproduction Note
Library holds archival microfiches negative and service copy. 2 fiches. (Micrographics International, 2015)
Technical Details
The full text of the dissertation is available as an Adobe Acrobat .pdf file ; Adobe Acrobat Reader required to view the file.
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