Outline
•Euler-Euler
–Wall Boiling Model
–Non-Drag Forces •Euler-Lagrange
–Particle collision model
–Wall film Modeling
–Particle-Wall Interaction •Other news/improvements
RPI Wall Boiling Model •Determines Heat Flux Partition
at Wall:
–Q = Q
c
+ Q q + Q e
–Q
c
= Convective Heat Transfer
•Determined by Turbulent Wall Function
–Q
q
= Quenching Heat Transfer •Departure of a bubble from heated
surface  cooling of surface by fresh
water.
–Q
e
= Evaporative Heat Transfer •Determined by physical sub-models on
the sub-grid scale.
Q
w
a
l
l G
QC
QE
QQ
Wall Boiling Validation:
Bartolomej Test Case
•MMT Validation Test Case
–Subcooled Boiling in Pipe with Heated Wall Bartolomej et al. (1967, 1982) (Conxita Lifante, 2008)
•large number of experimental testcase conditions with data
•steam-water pipe flow with wall boiling
•liquid sub-cooling defined to have steam inception
always at the same wall height
–Different configurations were studied in the paper.
Main parameters:
•Mass inflow rate
•Pressure
•Wall heat flux
•Pipe diameter
Bartolomej Test Case: Descriptionreactor core介绍
•2D axial symmetry,
steady simulation
•1 degree extrusion
•Specified heat flux at
the wall
• at
planes and axis
• with given
inlet mass flow
• with
average static pressure X=X/100
X=2m
R