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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：
. Y' c0 C+ Q) q; ^1 x/ B' }- z7 s1 @6 b K2 d- C! u" F
1。 若是水， 则应该参考：
4 L9 _- @! d. q$ r. l( t3 N: r6 s; w$ U4 O2 H' P Y' v: t8 _5 q* u' ]
If the gas whose flow is computed includes steam, COSMOSFloWorks can predict an , X5 m% H# m9 {; i. H* m8 Z
equilibrium volume condensation of water from this steam (without any surface & Z4 \( y ]2 }* ~) \ z: p# Q
condensation) taking into account the corresponding changes of the steam’s temperature, N. j3 U" L D3 v+ h- n& f; }
density, enthalpy, specific heat, and sonic velocity. In accordance with the equilibrium
' W8 K' P9 ^3 M4 F, zapproach, the condensed water’s local mass fraction in the local total mass of the steam ' _* U0 W- }+ w, v
and the condensed water is determined from the fluid’s local temperature, pressure, and, if
) O- {0 @! a+ v& ka multi-component fluid is considered, the steam’s local mass fraction. Since this ; [6 d% c- X4 s1 l9 F
condensation model is at equilibrium, the condensation has no history, i.e. it is a local fluid ; K4 Z5 z( |4 x1 ?
property only." q S* q! u4 \
In addition, it is assumed that. |3 `$ S+ h! x7 M$ c9 C. [
• the condensed water’s volume is equal to zero, so this prediction is correct only if
; s/ u+ K( Q+ Vthe condensed water’s relative volume does not exceed 5%,
6 }& X L+ |! g# v. G7 r" l; G• the steam’s temperature lie in the range of 283...610 K and the pressure does not
1 {! p! r- V y" rexceed 10 MPa. |
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