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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：# `7 ?& [! x9 `1 L! f5 X* i
4 P% a8 A4 S! n' N7 u0 e( r8 i1。 若是水， 则应该参考：
. L' x. o$ O( G( r& S8 \3 N ^7 G# Q, A! r
If the gas whose flow is computed includes steam, COSMOSFloWorks can predict an / o8 n1 a, ?7 h% ]# r% f9 y9 y
equilibrium volume condensation of water from this steam (without any surface ' G! E6 Q6 }& W
condensation) taking into account the corresponding changes of the steam’s temperature, 4 U0 n1 i. l8 c" \! b% t
density, enthalpy, specific heat, and sonic velocity. In accordance with the equilibrium # J- I0 k- ^( r: f& j$ t
approach, the condensed water’s local mass fraction in the local total mass of the steam 2 P; y2 s$ G. a7 l( @; t( M/ _
and the condensed water is determined from the fluid’s local temperature, pressure, and, if 3 x+ M- c$ t7 o2 O& }& w( F
a multi-component fluid is considered, the steam’s local mass fraction. Since this
]* d7 d; W- l: \3 Rcondensation model is at equilibrium, the condensation has no history, i.e. it is a local fluid . K* P9 Q" p. l
property only.1 N* E, F7 v/ p( e& a" q: `# u7 g2 |
In addition, it is assumed that. O( h+ v! X; L+ X
• the condensed water’s volume is equal to zero, so this prediction is correct only if r, I0 @! `2 N. o
the condensed water’s relative volume does not exceed 5%,
! L/ B0 S7 c: G2 { d• the steam’s temperature lie in the range of 283...610 K and the pressure does not
- b6 s9 l) S" t* A3 w2 J$ `exceed 10 MPa. |
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