Unexpected heat transfer oscillations in steady annular flow detected by synchronized infrared and liquid film sensor measurements
Simultaneous measurement of liquid film characteristics and heat transfer in annular two-phase flow is a major experimental challenge. In this study, we implement an innovative integrated infrared (IR) heater and liquid film electrical-conductance sensor in combination with high-speed IR thermograph...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
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American Nuclear Society
2020
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| Online Access: | https://hdl.handle.net/1721.1/126760 |
| _version_ | 1811089599577980928 |
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| author | Su, G.- Y. Phillips, Bren Andrew Buongiorno, Jacopo |
| author2 | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Su, G.- Y. Phillips, Bren Andrew Buongiorno, Jacopo |
| author_sort | Su, G.- Y. |
| collection | MIT |
| description | Simultaneous measurement of liquid film characteristics and heat transfer in annular two-phase flow is a major experimental challenge. In this study, we implement an innovative integrated infrared (IR) heater and liquid film electrical-conductance sensor in combination with high-speed IR thermography, which results in an accurate, synchronized and co-located measurement of liquid film characteristics and local heat transfer at the heated surface in diabatic annular two-phase flow. The measurements reveal that disturbance waves have a significant effect on the instantaneous heat transfer response in nominally-steady vertically upward annular flow of steam-water mixtures. Although the heat flux applied at the wall is constant in time, the passage of the waves causes significant periodic oscillations of the local heat transfer coefficient and wall superheat in the forced convective evaporation regime, which are reported in this study. |
| first_indexed | 2024-09-23T14:21:46Z |
| format | Article |
| id | mit-1721.1/126760 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T14:21:46Z |
| publishDate | 2020 |
| publisher | American Nuclear Society |
| record_format | dspace |
| spelling | mit-1721.1/1267602022-09-29T08:59:17Z Unexpected heat transfer oscillations in steady annular flow detected by synchronized infrared and liquid film sensor measurements Su, G.- Y. Phillips, Bren Andrew Buongiorno, Jacopo Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Simultaneous measurement of liquid film characteristics and heat transfer in annular two-phase flow is a major experimental challenge. In this study, we implement an innovative integrated infrared (IR) heater and liquid film electrical-conductance sensor in combination with high-speed IR thermography, which results in an accurate, synchronized and co-located measurement of liquid film characteristics and local heat transfer at the heated surface in diabatic annular two-phase flow. The measurements reveal that disturbance waves have a significant effect on the instantaneous heat transfer response in nominally-steady vertically upward annular flow of steam-water mixtures. Although the heat flux applied at the wall is constant in time, the passage of the waves causes significant periodic oscillations of the local heat transfer coefficient and wall superheat in the forced convective evaporation regime, which are reported in this study. 2020-08-24T17:48:44Z 2020-08-24T17:48:44Z 2019-08 2020-08-21T12:04:01Z Article http://purl.org/eprint/type/ConferencePaper 9780894487675 https://hdl.handle.net/1721.1/126760 Su, G.- Y. et al. “Unexpected heat transfer oscillations in steady annular flow detected by synchronized infrared and liquid film sensor measurements.” 18th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2019, 2019, (August 2019): 5709 - 5715 © 2019 The Author(s) en 18th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2019 Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf American Nuclear Society Prof. Buongiorno via Chris Sherratt |
| spellingShingle | Su, G.- Y. Phillips, Bren Andrew Buongiorno, Jacopo Unexpected heat transfer oscillations in steady annular flow detected by synchronized infrared and liquid film sensor measurements |
| title | Unexpected heat transfer oscillations in steady annular flow detected by synchronized infrared and liquid film sensor measurements |
| title_full | Unexpected heat transfer oscillations in steady annular flow detected by synchronized infrared and liquid film sensor measurements |
| title_fullStr | Unexpected heat transfer oscillations in steady annular flow detected by synchronized infrared and liquid film sensor measurements |
| title_full_unstemmed | Unexpected heat transfer oscillations in steady annular flow detected by synchronized infrared and liquid film sensor measurements |
| title_short | Unexpected heat transfer oscillations in steady annular flow detected by synchronized infrared and liquid film sensor measurements |
| title_sort | unexpected heat transfer oscillations in steady annular flow detected by synchronized infrared and liquid film sensor measurements |
| url | https://hdl.handle.net/1721.1/126760 |
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