Model for boiling and dryout in particle beds. [LMFBR]

Technical Report · Tue Jun 01 04:00:00 EDT 1982

DOI:https://doi.org/10.2172/5114771· OSTI ID:5114771

Lipinski, R. J.

Over the last ten years experiments and modeling of dryout in particle beds have produced over fifty papers. Considering only volume-heated beds, over 250 dryout measurements have been made, and are listed in this work. In addition, fifteen models to predict dryout have been produced and are discussed. A model is developed in this report for one-dimensional boiling and dryout in a porous medium. It is based on conservation laws for mass, momentum, and energy. The initial coupled differential equations are reduced to a single first-order differential equation with an algebraic equation for the upper boundary condition. The model includes the effects of both laminar and turbulent flow, two-phase friction, and capillary force. The boundary condition at the bed bottom includes the possibility of inflowing liquid and either an adiabatic or a bottom-cooled support structure. The top of the bed may be either channeled or subcooled. In the first case the channel length and the saturation at the base of the channels are predicted. In the latter case, a criterion for penetration of the subcooled zone by channels is obtained.

• Research Organization: Sandia National Labs., Albuquerque, NM (United States)
• Sponsoring Organization: US Nuclear Regulatory Commission (NRC), Washington, DC (United States); USDOE
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5114771
• Report Number(s): NUREG/CR--2646; SAND--82-0765; ON: DE82021577
• Country of Publication: United States
• Language: English

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