Controlling CRUD vapor chimney formation in LWRs through surface modification
Thesis: S.M., Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, 2014.
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| Other Authors: | |
| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2015
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| Online Access: | http://hdl.handle.net/1721.1/95594 |
| _version_ | 1826200579251109888 |
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| author | Lin, Leigh |
| author2 | Michael P. Short. |
| author_facet | Michael P. Short. Lin, Leigh |
| author_sort | Lin, Leigh |
| collection | MIT |
| description | Thesis: S.M., Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, 2014. |
| first_indexed | 2024-09-23T11:38:34Z |
| format | Thesis |
| id | mit-1721.1/95594 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T11:38:34Z |
| publishDate | 2015 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/955942019-04-10T09:34:02Z Controlling CRUD vapor chimney formation in LWRs through surface modification Controlling Chalk River Unidentified Deposits vapor chimney formation in Light Water Reactors through surface modification Lin, Leigh Michael P. Short. Massachusetts Institute of Technology. Department of Nuclear Science and Engineering. Massachusetts Institute of Technology. Department of Nuclear Science and Engineering. Nuclear Science and Engineering. Thesis: S.M., Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, 2014. Cataloged from PDF version of thesis. Includes bibliographical references (pages 105-112). Fouling has been a persistent problem for fluid-solid interfaces, varying from heat exchangers to ship hulls. In nuclear power plants, buildup of CRUD can accelerate corrosion, increase pressure drops, cause axial power shifts, and increase radiation dose to workers. In this experiment, we studied the effect of induced microcavity and micropost patterns on CRUD morphology at atmospheric pressure. Samples with various pitches of microcavities and microposts were boiled in simulated PWR coolant. The effect of heat flux on CRUD formation was also examined. The experiments support previous theories that subcooled nucleate boiling is enhanced at microcavities, and that CRUD deposition is promoted at those sites. A thin ring of particles, less than a micrometer in width, was seen around most microcavities even when the surrounding areas were crudded. However, some of the samples with microcavity pitches 50 pm and smaller experienced a pattern of clean and crudded areas, with the region around the microcavities free of CRUD more often than not. A theory is put forth that this is caused by interfering forces due to bubbles collapsing. The micropost samples showed substantial CRUD growth, particularly for the sample subjected to a high heat flux. The results of this experiment could have major implications for development of a self-cleaning material for heated surfaces. by Leigh Lin. S.M. 2015-02-25T17:12:37Z 2015-02-25T17:12:37Z 2014 2014 Thesis http://hdl.handle.net/1721.1/95594 903695696 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 113, [2] pages application/pdf Massachusetts Institute of Technology |
| spellingShingle | Nuclear Science and Engineering. Lin, Leigh Controlling CRUD vapor chimney formation in LWRs through surface modification |
| title | Controlling CRUD vapor chimney formation in LWRs through surface modification |
| title_full | Controlling CRUD vapor chimney formation in LWRs through surface modification |
| title_fullStr | Controlling CRUD vapor chimney formation in LWRs through surface modification |
| title_full_unstemmed | Controlling CRUD vapor chimney formation in LWRs through surface modification |
| title_short | Controlling CRUD vapor chimney formation in LWRs through surface modification |
| title_sort | controlling crud vapor chimney formation in lwrs through surface modification |
| topic | Nuclear Science and Engineering. |
| url | http://hdl.handle.net/1721.1/95594 |
| work_keys_str_mv | AT linleigh controllingcrudvaporchimneyformationinlwrsthroughsurfacemodification AT linleigh controllingchalkriverunidentifieddepositsvaporchimneyformationinlightwaterreactorsthroughsurfacemodification |