Code Manual for CONTAIN 2.0 - Federation of American Scientists

Finally, the mass transfer rate of vapor, homogeneously dispersed liquid coolant, and
noncondensables from the pool to the atmosphere, including the equilibrated and non-equilibrated
parts of the flow, is given by
Wpai =Wp%ve,i +Wp%v,,i +Wpqm,i +Wp%nc,i
(4-19)
The energy addition rate to the atmosphere as a result of the mass transfer from the pool, including
the equilibrated and nonequilibrated parts and referenced to the pool surface, is given by
%%i = X (1 ‘\i)6ji[wji-ij ‘gwji~j ‘Hp,i)] ‘X ~iOjiwnc,jihnc,ji(T~,i)
.. ..
‘wvei:v(T;i3ps(TQ) ‘wvsJhJTs~>ps(TsJ;
(4-20)
The self-consistent temperature T~,iis determined by an enthalpy balance condition, using the net
energy addition rate qqj to the pool as a result of equilibration
qeq,i ‘~ $i”ji[%p,ji ‘gwji~j ‘HP~)-wnc,ji%c,ji(T~,i)] ‘WPavejhv(T~j~P5(T~,i)) (4-21)
ji
‘wp,vs,i%(Ts,i>pi)
The energy balance condition is
where
m~,ihp(T~,i,pi)- mP,ih~TP,i,pi)=~,iAtf
m’ ~,i = mpi +Wq iAtf
is the net change in the mass of the pool due to equilibration and
‘c@ = ~
..w ‘TVp~~e,i - ‘pqvs,i
~i ‘J1 V,Jl
ji
is the net mass transfer rate to the pool due to equilibration.
4.4.8 The Gas Evolution Velocity at the Pool-Atmosphere Interface
(4-22)
(4-23)
(4-24)
The velocity of gas evolving or rising from the pool-gas interface in a cell may be non-zero for a
number of reasons: (1) boiling or flashing of the pool, as discussed in Section 4.4.6; (2) injection of
gas below the surface of the coolant pool from submerged gas flow paths or the dedicated
suppression vent model, which can result in gases that are partially or completely equilibrated, as
O 439 6/30/97