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发表于 2010-6-21 23:41:30
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来自： 美国
你问的太含混：) f N8 P4 V. i, ]) f% U
! I8 A1 r& d0 V) R) H7 `/ v1。 若是水， 则应该参考：
1 B$ u& e7 V W# m! c y* o$ h& u) ~" A- T) Z/ F, Z
If the gas whose flow is computed includes steam, COSMOSFloWorks can predict an
" u; I; G! I4 f3 l5 P5 l" A! }equilibrium volume condensation of water from this steam (without any surface
! R8 W) ?( [$ i0 u( s! t% j* mcondensation) taking into account the corresponding changes of the steam’s temperature, * k: K& p# r; ]1 M& y0 u' j% w1 [
density, enthalpy, specific heat, and sonic velocity. In accordance with the equilibrium
: E4 G- _" V' H$ _% Mapproach, the condensed water’s local mass fraction in the local total mass of the steam
+ l x4 t, |; p# eand the condensed water is determined from the fluid’s local temperature, pressure, and, if
" A1 E% X9 [) Z/ x2 V$ ya multi-component fluid is considered, the steam’s local mass fraction. Since this ( C* [& s' j3 V
condensation model is at equilibrium, the condensation has no history, i.e. it is a local fluid
6 b y0 U$ o( u* `# G8 i4 hproperty only.
! y# v- Q; o$ s( V# o4 e( uIn addition, it is assumed that
5 t3 j+ Q3 ^, Z d3 V% D• the condensed water’s volume is equal to zero, so this prediction is correct only if
; D( ~+ j9 v7 e$ e2 E% wthe condensed water’s relative volume does not exceed 5%,
% J2 e; b% b7 U z: B3 Q• the steam’s temperature lie in the range of 283...610 K and the pressure does not 9 z$ d( D& Y3 Z$ [
exceed 10 MPa. |
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