SIMULATION OF BOILING HEAT TRANSFER AROUND MICRO PIN-FIN HEAT EXCHANGER: PROGRESS AND CHALLENGES

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Boiling at microscales is a challenging problem for the computational models as well as the resources. During boiling, the formation and departure of vapor bubbles from the heated surface involves the physics from nano/micro level to the macro level. Therefore, a hierarchical methodology is needed to incorporate the nano/microscale physics with the macroscale system performance. Using micro-fabrication techniques, microstructures (micropin-fins) can be fabricated around the tubes in the heat exchanger of Pressurized Water Reactors (PWRs) to increase the heat-exchanging efficiency and reduce the overall size of the heat-exchanger for the given heat transfer rates. Combined with high fidelity simulations of ... continued below

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Tyagi, M.; Maha, A.; Singh, K. V.; Li, G. & and Pang, S.S. July 1, 2006.

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Boiling at microscales is a challenging problem for the computational models as well as the resources. During boiling, the formation and departure of vapor bubbles from the heated surface involves the physics from nano/micro level to the macro level. Therefore, a hierarchical methodology is needed to incorporate the nano/microscale physics with the macroscale system performance. Using micro-fabrication techniques, microstructures (micropin-fins) can be fabricated around the tubes in the heat exchanger of Pressurized Water Reactors (PWRs) to increase the heat-exchanging efficiency and reduce the overall size of the heat-exchanger for the given heat transfer rates. Combined with high fidelity simulations of the thermal transport in the entire system, optimal design of microstructure patterns and layouts can be worked out pragmatically. Properly patterned microstructures on the pipe in the steam generation zone should create more nuclei for bubble to form and result in a reduced average bubble size and shorter retention time, i.e. the time for the vapor phase sticking on the pipe surface. The smaller average steam bubble size and shorter bubble retention time will enhance the overall thermal efficiency. As a preliminary step, a periodic arrangement of micropin-fins containing four in-line cylindrical fins was modeled. The governing equations for the mass, momentum and energy transport were solved in the fluid in a conjugate heat transfer mode. In the future, several studies will be conducted to simulate different geometric arrangements, different fin cross-sections, and realistic operating conditions including phase-change with boiling by adding complexities in simple steps.

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  • Journal Name: ICCE-14 FOURTEENTH ANNUAL INTERNATIONAL CONFERENCE ON COMPOSITES/NANO ENGINEERING; Conference: ICCE-14 Fourteenth International Conference on Composites or Nano Engineering; Boulder, Colorado; July 2-8, 2006

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  • Report No.: DOE/NA/27041-3
  • Grant Number: FG52-05NA27041
  • Office of Scientific & Technical Information Report Number: 889138
  • Archival Resource Key: ark:/67531/metadc874271

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • July 1, 2006

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  • Sept. 21, 2016, 2:29 a.m.

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  • Oct. 31, 2016, 8:23 p.m.

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Tyagi, M.; Maha, A.; Singh, K. V.; Li, G. & and Pang, S.S. SIMULATION OF BOILING HEAT TRANSFER AROUND MICRO PIN-FIN HEAT EXCHANGER: PROGRESS AND CHALLENGES, article, July 1, 2006; United States. (digital.library.unt.edu/ark:/67531/metadc874271/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.