SIG53 and SIG35 Winter School

Boiling Phenomena: Physics and Characterization

_{15th - 20th December 2024}

_{CNRS Paul Langevin Center in Aussois, France}

This winter school is a collaboration between industrial partners
IFP Energies Nouvelles, Constellium, CEA, EDF, ArianGroup, AirLiquide, Arcelor Mittal
and
French CNRS laboratories LEMPTA, IMFT, CETHIL, LTEN, the CNRS GDR “TransInter”

A​ll information is available here

O​BJECTIVES:

The objective is to highlight the physical phenomena characterizing the gas phase formation under complex thermal and hydrodynamic conditions. A special attention will be paid to the modelling aspects. The courses will be given in English by French and foreign experts in the fields. Participants will be invited to present their research and questions on the subject in poster sessions to foster the interactivity of the courses.

​PLANNED LECTURES:

Phase Change Thermodynamics and Interface Thermodynamics (2h); Nicolas Rimbert

• First and second laws of thermodynamics
• Thermodynamic potentials and thermodynamic equilibrium
• Continuity of liquid and gaseous state (Van der Waals Equation of State)
• Corresponding state theorem and Maxwell lever rule
• Interface thermodynamics
• Surfactants

Classical Nucleation Theory (2h), Benoit Stutz

• Equilibrium and stability of a steam nucleus in a metastable fluid
• Homogeneous nucleation
• Heterogeneous nucleation
• Activation and resorption of pre-existing seeds
• Density of nucleation sites
• Case studies

Balance equations (4h), Antoine Gerschenfeld

• Derivation of the averaged multiphase balance equations in their 3D and 1D form
• Remarks on their behavior in practice
• Algorithms for solving these equations numerically.

The kinetics of the phase transition in the boiling process (2h), Mikhael Gorokhovski

• The homogeneous bubble nucleation theory and the kinetic evolution of nucleation site populations
• The heterogeneous nucleation and bubble ebullition
• Emergence of scaling universality and power law behaviour closely to the critical temperature

Single bubble growth and dynamics (2h), Boiling aroun the critical point Vadim Nikolaeyev
Pool boiling (2h), Romuald Rulllière

• Regimes of pool boiling (boiling curves)
• Nucleate boiling regime: nucleation, bubble dynamics and heat transfer
• Critical heat flux
• Film boiling regime
• Parametric effects

Convective boiling (4h), Catherine Colin

• Flow regimes (phenomenology and models)
• Hydrodynamical regime
• Thermal regime
• Transition criteria
• Illustrative examples
• Evaporators
• Thermosiphon loop
• Transient conditions

Numerical methods (4h), Sébastien Tanguy and Benjamin Duret

• Importance of interface deformations and topology changes in the context of liquid-vapor phase changes
• Interface tracking method (LS, VOF)
• Projection method for incompressible two-phase flows without phase change
• Numerical methods to handle jump conditions at the interface (GFM, CSF…)
• Phase change: governing equations and jump conditions
• Advanced numerical methods dedicated to phase change (GFM, Aslam, imposing Dirichlet, Neumann and Robin boundary condition at the interface)
• Validation / benchmark
• Phase change modelling at the contact line – coupling with conjugate transfer
• Compressible solver for phase change simulation in non-isobaric conditions (pool cavitation, hydrodynamic cavitation)

Experimental methods (4h),
Matteo Bucci, Cambridge, Matevz Zupancic, Ljubjana Univ., Renaud Meignen, IRSN, Cadarache

• Wall heat flux measurement
• Surface Structuration Special Topics:

• High Pressure Boiling
• Vapor Explosion
• General presentation of FCI and Vapor Explosion
• Issues for nuclear safety
• Other contexts
• Potential mechanisms for the pressure build-up
• Thermodynamic models
• Thermal detonation models
• Boiling in supercritical conditions
• Differences between water and sodium
• Film boiling
• CFD models – code MC3D
• On DNS technic for the resolution of the issue

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