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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：
" A: b& w: |- j% z# m9 T8 B2 o; M6 a+ ^1 B5 w
1。 若是水， 则应该参考：* W3 a" v7 W, R, z" {2 g! ?
; S# B& h, R1 E6 n& m A
If the gas whose flow is computed includes steam, COSMOSFloWorks can predict an
. |3 V' G* P1 d0 J8 P: k- n. oequilibrium volume condensation of water from this steam (without any surface 6 }$ p+ D. f; M, x# x9 E2 \! {
condensation) taking into account the corresponding changes of the steam’s temperature, ; ~5 y8 x: q4 l: G
density, enthalpy, specific heat, and sonic velocity. In accordance with the equilibrium 9 r9 {0 T; S; r- f$ w
approach, the condensed water’s local mass fraction in the local total mass of the steam
; X# W" i+ `, n" U- _2 kand the condensed water is determined from the fluid’s local temperature, pressure, and, if X( R2 r% e" O: e! k) E
a multi-component fluid is considered, the steam’s local mass fraction. Since this # O- Z6 N7 p5 {" [' l, U4 T% ~- D
condensation model is at equilibrium, the condensation has no history, i.e. it is a local fluid 8 k; m8 q) O" b! N, K
property only.
% m! t( G5 ?" f& M0 iIn addition, it is assumed that* R+ Z6 o5 y9 ^
• the condensed water’s volume is equal to zero, so this prediction is correct only if
4 V& n7 c/ C, R( N$ _7 Ithe condensed water’s relative volume does not exceed 5%,; U5 p% b5 Z2 l* ?
• the steam’s temperature lie in the range of 283...610 K and the pressure does not
' I! ^; k- u" ^# i* a% y8 g4 K9 Eexceed 10 MPa. |
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