2020-10-24T18:12:34Zhttps://gredos.usal.es/oai/requestoai:gredos.usal.es:10366/1386252020-06-18T14:53:07Zcom_10366_138605com_10366_4512com_10366_3823col_10366_138606
Characterizing wet and dry fluids in temperature-entropy diagrams
White Sánchez, Juan Antonio
Velasco Maíllo, Santiago
Temperature-entropy saturation curve
Saturation properties
Wet and dry fluids
Saturation heat capacities
[EN]In this work we show that the shape of the liquid-vapor saturation curve in a
Tr-s diagram (Tr = T=Tc and s = s=R, with Tc the critical temperature, s
the molar entropy and R the gas constant) for a given
uid is mainly governed
by the acentric factor, !, and the critical molar volume, vc, of the
uid. The
study uses as reference the point M where the saturated vapor curve in the
Tr-s diagram changes its concavity, i.e. (d2s g=dT2
r )M = 0. By analyzing
the data provided by the National Standards and Technology (NIST) program
RefProp 9.1 for 121
uids, we nd that, at this point, TMr 0:81 and the
slope M
= (ds g=dTr)M is well correlated with vc, existing a threshold value
vc;0 0:22 m3 kmol-1 so that M
< 0 (wet
uid) for vc < vc;0 and M
> 0 (dry
uid) for vc > vc;0. This direct relation between vc and the wet or dry character
of a
uid is the main result of the present work. Furthermore, the dimensionless
vaporization entropy at the reference point M, vs
M = s g
M-s lM , increases in a
nearly linear way with !
2018-10-16
2018-10-16
2018-03-22
info:eu-repo/semantics/article
White Sánchez, J.A., Velasco, S. Characterizing wet and dry fluids in temperature-entropy diagrams. Energy, 154, pp- 269-276
http://hdl.handle.net/10366/138625
10.1016/j.energy.2018.04.105
eng
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Attribution-NonCommercial-NoDerivs 4.0 International