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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：0 f1 J; H: F6 @, c/ i
/ g8 O8 W) Z- i% f$ B1 R& e1。 若是水， 则应该参考：% ^5 F0 a- |0 M0 e; b' X
6 H: K& S' H, ~. e
If the gas whose flow is computed includes steam, COSMOSFloWorks can predict an
2 d' \. J' k2 c) Lequilibrium volume condensation of water from this steam (without any surface : y- r' Y6 ~% }- E4 U+ c ?5 i4 W7 R& j
condensation) taking into account the corresponding changes of the steam’s temperature,
6 e: R# L& n4 O% B o' `density, enthalpy, specific heat, and sonic velocity. In accordance with the equilibrium
- A* p4 P5 d3 s# T9 b, _approach, the condensed water’s local mass fraction in the local total mass of the steam
2 M, e: n7 J$ y ^3 Z) jand the condensed water is determined from the fluid’s local temperature, pressure, and, if
4 Q# C+ p/ ]# xa multi-component fluid is considered, the steam’s local mass fraction. Since this 2 M' \( j* l+ S8 S% s; ?
condensation model is at equilibrium, the condensation has no history, i.e. it is a local fluid
, J& m. r/ ^, p& c/ n# yproperty only.
3 Q5 I z& }0 dIn addition, it is assumed that
/ I. s1 Z7 e5 j% R( x• the condensed water’s volume is equal to zero, so this prediction is correct only if / r- S- x& E8 K' D; C3 ]
the condensed water’s relative volume does not exceed 5%,
/ [2 R2 K5 Z* B: T• the steam’s temperature lie in the range of 283...610 K and the pressure does not 5 v3 e$ d" t: U8 V+ I
exceed 10 MPa. |
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