Advancement of closure relations for annular flow modeling in CFD

In Boiling water Reactors (BWRs), the presence of a liquid film in contact with the heated rod surface is crucial to ensure an efficient heat removal and prevent the threatening occurrence of dryout. The accurate prediction of the complex multidimensional liquid film behavior in advanced BWR fuel assemblies is critical to guarantee improved reactors performance and safety. Multiphase- CFD (M-CFD) brings the ability to model the complex three-dimensional flow structures in annular flow regime [1], while physics-based constitutive equations are needed to accurately represent the phase interactions, particularly at the liquid film interface. The development of closure relations for droplet deposition and entrainment as well as wave-induced interfacial shear, is a major priority for the modeling of annular flow in M-CFD. In annular flow conditions, liquid is continuously exchanged at the interface between the bulk steam and the film on the walls.

Name thesis:degree_name

Doctoral

Department dc:contributor.department

Massachusetts Institute of Technology. Department of Nuclear Science and Engineering

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2020

Author dc:creator

• Agostinelli, Giulia.

Advisor dc:contributor.advisor

• Emilio Baglietto.

• Nuclear Science and Engineering.

Statement dc:rights

• MIT theses may be protected by copyright. Please reuse MIT thesis content according to the MIT Libraries Permissions Policy, which is available through the URL provided.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

https://hdl.handle.net/1721.1/129364

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/129364