Description of boiling project burnout detector
Introduction: In order to effectively utilize the high heat flux available through the mechanism of nucleate boiling in forced convection heat transfer, it is of primary importance that the maximum flux or "burnout" conditions be known for the liquid under consideration. It is a characteri...
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| Format: | Technical Report |
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Cambridge, Mass. : M.I.T. Heat Transfer Laboratory, [1957]
2011
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| Online Access: | http://hdl.handle.net/1721.1/61487 |
| _version_ | 1811080337401315328 |
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| author | Raymond, M. W. Reynolds John Mitchell |
| author2 | Massachusetts Institute of Technology. Division of Sponsored Research. |
| author_facet | Massachusetts Institute of Technology. Division of Sponsored Research. Raymond, M. W. Reynolds John Mitchell |
| author_sort | Raymond, M. W. |
| collection | MIT |
| description | Introduction: In order to effectively utilize the high heat flux available through the mechanism of nucleate boiling in forced convection heat transfer, it is of primary importance that the maximum flux or "burnout" conditions be known for the liquid under consideration. It is a characteristic of the boiling heat transfer process that, as attempts are made to exceed the burnout heat flux, the conditions at the heat transfer surface become such that the heat transfer coefficient decreases with increasing temperature difference between the wall and fluid. If the apparatus in which this process occurs is not of the type in which a constant temperature is imposed, another equilibrium point will be reached at a significantly higher wall temperature. In the case of water at pressures of atmospheric and higher, the wall temperature assumed in the new equilibrium state is high enough to cause failure in all but the most conservatively designed apparatus. Because of the unstable nature of the boiling process beyond the maximum vs. temperature difference on the q/A vs. L T curve, once the burnout temperature difference is exceeded, small power reductions will not save the heat exchanger from the major portion of the incipient temperature jump. Power must be reduced to a relatively low level to insure that excessive temperature will not be developed in the equipment. The time in which this power reduction must be accomplished depends on the particular flux and the heat capacity of the system being used; however, in most practical cases, this time can be expected to be extremely short. |
| first_indexed | 2024-09-23T11:29:44Z |
| format | Technical Report |
| id | mit-1721.1/61487 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T11:29:44Z |
| publishDate | 2011 |
| publisher | Cambridge, Mass. : M.I.T. Heat Transfer Laboratory, [1957] |
| record_format | dspace |
| spelling | mit-1721.1/614872019-04-12T11:58:10Z Description of boiling project burnout detector Raymond, M. W. Reynolds John Mitchell Massachusetts Institute of Technology. Division of Sponsored Research. Massachusetts Institute of Technology. Heat Transfer Laboratory. Boiling-points. Detectors. Introduction: In order to effectively utilize the high heat flux available through the mechanism of nucleate boiling in forced convection heat transfer, it is of primary importance that the maximum flux or "burnout" conditions be known for the liquid under consideration. It is a characteristic of the boiling heat transfer process that, as attempts are made to exceed the burnout heat flux, the conditions at the heat transfer surface become such that the heat transfer coefficient decreases with increasing temperature difference between the wall and fluid. If the apparatus in which this process occurs is not of the type in which a constant temperature is imposed, another equilibrium point will be reached at a significantly higher wall temperature. In the case of water at pressures of atmospheric and higher, the wall temperature assumed in the new equilibrium state is high enough to cause failure in all but the most conservatively designed apparatus. Because of the unstable nature of the boiling process beyond the maximum vs. temperature difference on the q/A vs. L T curve, once the burnout temperature difference is exceeded, small power reductions will not save the heat exchanger from the major portion of the incipient temperature jump. Power must be reduced to a relatively low level to insure that excessive temperature will not be developed in the equipment. The time in which this power reduction must be accomplished depends on the particular flux and the heat capacity of the system being used; however, in most practical cases, this time can be expected to be extremely short. Office of Naval Research D.S.R. Project 2011-03-04T23:36:37Z 2011-03-04T23:36:37Z 1957 Technical Report 14135743 http://hdl.handle.net/1721.1/61487 Technical report (Massachusetts Institute of Technology, Heat Transfer Laboratory) ; no. 11. 6, 9 (unnumbered) leaves application/pdf Cambridge, Mass. : M.I.T. Heat Transfer Laboratory, [1957] |
| spellingShingle | Boiling-points. Detectors. Raymond, M. W. Reynolds John Mitchell Description of boiling project burnout detector |
| title | Description of boiling project burnout detector |
| title_full | Description of boiling project burnout detector |
| title_fullStr | Description of boiling project burnout detector |
| title_full_unstemmed | Description of boiling project burnout detector |
| title_short | Description of boiling project burnout detector |
| title_sort | description of boiling project burnout detector |
| topic | Boiling-points. Detectors. |
| url | http://hdl.handle.net/1721.1/61487 |
| work_keys_str_mv | AT raymondmw descriptionofboilingprojectburnoutdetector AT reynoldsjohnmitchell descriptionofboilingprojectburnoutdetector |