FLiBe Radiative Heat Transfer

Title: FLiBe Radiative Heat Transfer

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Abstract

The liquid fluoride salt, FLiBe (2LiF-BeF2), has been proposed as a working fluid for Fluoride-Salt-Cooled High-Temperature Reactor (FHR) due to its desirable heat transport properties at high temperatures (500-700°C) as well as compatibility with graphite and several metals [1]. Due to the 4th power temperature dependence and the high temperature differences present in the various FHR heat exchangers (TCHX, DHX, and CTAH), radiative heat transfer in molten salt FLiBe may be important compared to natural or forced convection. Furthermore, because of the strong coupling between the temperature and velocity profiles, emission and absorption of radiation within the salt may significantly impact the thermal and hydrodynamic behavior of the fluid in the natural circulation systems of FHR. The present work investigates the significance of radiative transfer within the salt on the overall thermal energy conservation equation, and consequently the overall convective and radiative heat transfer coefficient. The purpose is to understand the radiative heat transfer effect on the steady-state energy equation for a moving salt in a 2D channel by computing a total Nusselt number that incorporates both radiation and convection. Moreover, the evolution of the thermal entrance region is of a particular importance because of the high heat transfer coefficientsmore »« less

Authors:

Derdeyn, Will ^[1]; Dbai, Mohamed Abou ^[1]; Scarlat, Raluca O. ^[1]; Trujillo, Mario ^[1]

University of Wisconsin–Madison, Madison, WI 53706

Publication Date:: 2018-06-17

Research Org.:: University of Wisconsin-Madison

Sponsoring Org.:: USDOE Office of Nuclear Energy (NE)

OSTI Identifier:: 1471715

DOE Contract Number:: NE0008680

Resource Type:: Conference

Journal Name:: Transactions of the American Nuclear Society

Additional Journal Information:: Journal Volume: 118; Journal Issue: none; Conference: 2018 ANS Annual Meeting, Philadelphia, Pennsylvania, Philadelphia, Pennsylvania, June 17–21, 2018; Journal ID: ISSN 0003-018X

Publisher:: American Nuclear Society

Country of Publication:: United States

Language:: English

Citation Formats


                    Derdeyn, Will, Dbai, Mohamed Abou, Scarlat, Raluca O., and Trujillo, Mario. FLiBe Radiative Heat Transfer.  United States: N. p., 2018. 
        Web.

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                    Derdeyn, Will, Dbai, Mohamed Abou, Scarlat, Raluca O., & Trujillo, Mario. FLiBe Radiative Heat Transfer.  United States.

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                    Derdeyn, Will, Dbai, Mohamed Abou, Scarlat, Raluca O., and Trujillo, Mario. Sun .  
        "FLiBe Radiative Heat Transfer".  United States.  https://www.osti.gov/servlets/purl/1471715.

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@article{osti_1471715,

  title        = {FLiBe Radiative Heat Transfer},

  author       = {Derdeyn, Will and Dbai, Mohamed Abou and Scarlat, Raluca O. and Trujillo, Mario},

  abstractNote = {The liquid fluoride salt, FLiBe (2LiF-BeF2), has been proposed as a working fluid for Fluoride-Salt-Cooled High-Temperature Reactor (FHR) due to its desirable heat transport properties at high temperatures (500-700°C) as well as compatibility with graphite and several metals [1]. Due to the 4th power temperature dependence and the high temperature differences present in the various FHR heat exchangers (TCHX, DHX, and CTAH), radiative heat transfer in molten salt FLiBe may be important compared to natural or forced convection. Furthermore, because of the strong coupling between the temperature and velocity profiles, emission and absorption of radiation within the salt may significantly impact the thermal and hydrodynamic behavior of the fluid in the natural circulation systems of FHR. The present work investigates the significance of radiative transfer within the salt on the overall thermal energy conservation equation, and consequently the overall convective and radiative heat transfer coefficient. The purpose is to understand the radiative heat transfer effect on the steady-state energy equation for a moving salt in a 2D channel by computing a total Nusselt number that incorporates both radiation and convection. Moreover, the evolution of the thermal entrance region is of a particular importance because of the high heat transfer coefficients attainable and the effect on the potential onset of various salt physical phenomena, like freezing and supercooling, as well as on the design of the passive decay heat removal systems of FHR, which are mostly buoyancy-driven pipe flow systems.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/1471715},
  journal      = {Transactions of the American Nuclear Society},

  issn         = {0003-018X},

  number       = none,

  volume       = 118,

  place        = {United States},

  year         = {2018},

  month        = {6}

}

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