Enhancement of Downward-Facing Saturated Boiling Heat Transfer by the Cold Spray Technique
In-vessel retention by passive external reactor vessel cooling under severe accident conditions is a viable approach for retention of radioactive core melt within the reactor vessel. In this study, a new and versatile coating technique known as “cold spray” that can readily be applied to operating a...
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| Format: | Article |
| Language: | English |
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Elsevier
2017-02-01
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| Series: | Nuclear Engineering and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1738573316301383 |
| _version_ | 1818136716044664832 |
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| author | Faruk A. Sohag Faith R. Beck Lokanath Mohanta Fan-Bill Cheung Albert E. Segall Timothy J. Eden John K. Potter |
| author_facet | Faruk A. Sohag Faith R. Beck Lokanath Mohanta Fan-Bill Cheung Albert E. Segall Timothy J. Eden John K. Potter |
| author_sort | Faruk A. Sohag |
| collection | DOAJ |
| description | In-vessel retention by passive external reactor vessel cooling under severe accident conditions is a viable approach for retention of radioactive core melt within the reactor vessel. In this study, a new and versatile coating technique known as “cold spray” that can readily be applied to operating and advanced reactors was developed to form a microporous coating on the outer surface of a simulated reactor lower head. Quenching experiments were performed under simulated in-vessel retention by passive external reactor vessel cooling conditions using test vessels with and without cold spray coatings. Quantitative measurements show that for all angular locations on the vessel outer surface, the local critical heat flux (CHF) values for the coated vessel were consistently higher than the corresponding CHF values for the bare vessel. However, it was also observed for both coated and uncoated surfaces that the local rate of boiling and local CHF limit vary appreciably along the outer surface of the test vessel. Nonetheless, results of this intriguing study clearly show that the use of cold spray coatings could enhance the local CHF limit for downward-facing boiling by > 88%. |
| first_indexed | 2024-12-11T09:44:49Z |
| format | Article |
| id | doaj.art-ce942a7daa564d548716beb7f34a05bc |
| institution | Directory Open Access Journal |
| issn | 1738-5733 |
| language | English |
| last_indexed | 2024-12-11T09:44:49Z |
| publishDate | 2017-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Engineering and Technology |
| spelling | doaj.art-ce942a7daa564d548716beb7f34a05bc2022-12-22T01:12:35ZengElsevierNuclear Engineering and Technology1738-57332017-02-0149111312210.1016/j.net.2016.08.005Enhancement of Downward-Facing Saturated Boiling Heat Transfer by the Cold Spray TechniqueFaruk A. Sohag0Faith R. Beck1Lokanath Mohanta2Fan-Bill Cheung3Albert E. Segall4Timothy J. Eden5John K. Potter6Department of Mechanical and Nuclear Engineering, Pennsylvania State University, University Park, PA 16802, USADepartment of Mechanical and Nuclear Engineering, Pennsylvania State University, University Park, PA 16802, USADepartment of Mechanical and Nuclear Engineering, Pennsylvania State University, University Park, PA 16802, USADepartment of Mechanical and Nuclear Engineering, Pennsylvania State University, University Park, PA 16802, USADepartment of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA 16802, USAApplied Research Laboratory, Pennsylvania State University, University Park, PA 16802, USAApplied Research Laboratory, Pennsylvania State University, University Park, PA 16802, USAIn-vessel retention by passive external reactor vessel cooling under severe accident conditions is a viable approach for retention of radioactive core melt within the reactor vessel. In this study, a new and versatile coating technique known as “cold spray” that can readily be applied to operating and advanced reactors was developed to form a microporous coating on the outer surface of a simulated reactor lower head. Quenching experiments were performed under simulated in-vessel retention by passive external reactor vessel cooling conditions using test vessels with and without cold spray coatings. Quantitative measurements show that for all angular locations on the vessel outer surface, the local critical heat flux (CHF) values for the coated vessel were consistently higher than the corresponding CHF values for the bare vessel. However, it was also observed for both coated and uncoated surfaces that the local rate of boiling and local CHF limit vary appreciably along the outer surface of the test vessel. Nonetheless, results of this intriguing study clearly show that the use of cold spray coatings could enhance the local CHF limit for downward-facing boiling by > 88%.http://www.sciencedirect.com/science/article/pii/S1738573316301383Cold SprayCritical Heat Flux LimitDownward-Facing BoilingIn-vessel RetentionMicroporous Coating |
| spellingShingle | Faruk A. Sohag Faith R. Beck Lokanath Mohanta Fan-Bill Cheung Albert E. Segall Timothy J. Eden John K. Potter Enhancement of Downward-Facing Saturated Boiling Heat Transfer by the Cold Spray Technique Nuclear Engineering and Technology Cold Spray Critical Heat Flux Limit Downward-Facing Boiling In-vessel Retention Microporous Coating |
| title | Enhancement of Downward-Facing Saturated Boiling Heat Transfer by the Cold Spray Technique |
| title_full | Enhancement of Downward-Facing Saturated Boiling Heat Transfer by the Cold Spray Technique |
| title_fullStr | Enhancement of Downward-Facing Saturated Boiling Heat Transfer by the Cold Spray Technique |
| title_full_unstemmed | Enhancement of Downward-Facing Saturated Boiling Heat Transfer by the Cold Spray Technique |
| title_short | Enhancement of Downward-Facing Saturated Boiling Heat Transfer by the Cold Spray Technique |
| title_sort | enhancement of downward facing saturated boiling heat transfer by the cold spray technique |
| topic | Cold Spray Critical Heat Flux Limit Downward-Facing Boiling In-vessel Retention Microporous Coating |
| url | http://www.sciencedirect.com/science/article/pii/S1738573316301383 |
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