MODE = ST (70)

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MODE = ST (70)

Note: If the $ConvertEESREFPROPUnits directive is used in the EES program, inputs should be provided in the unit system defined in EES and outputs will be automatically converted to the unit system defined in EES. The units shown for inputs and outputs in the following description apply when the $CONVERTEESREFPROPUNITS directive is not used.

Description: Calculate surface tension, given a saturation temperature.
     In1 = Temperature in K
     In2 = mole fraction of first component (skip for pure fluid)
     ...
     InN = mole fraction of next to last component
            Note: If the /mass flag is provided with the $CONVERTEESREFPROPUNITS directive, mass fractions should be provided instead of mole fractions.
     Out1 = surface tension of the fluid or fluid mixture in N/m

Example 1:
ST=70        "indicates a surface temperature calculation"
T=300 [K]   "saturation temperature"
mf=0.3       "mole fraction"
Call ees_refprop('R32+R134a', ST, T, mf : sigma)
$varinfo sigma units=N/m

{Solution
mf=0.3
sigma=0.007404 [N/m]
ST=70
T=300 [K]
}

Example 2:
$UnitSystem Eng F psia mass
$ConvertEESREFPROPUnits /mass
ST=70      "indicates a surface temperature calculation"
T=70 [F]   "saturation temperature"
Call ees_refprop('R134a', ST, T : sigma)
$varinfo sigma units=lb_f/ft

{Solution
sigma=0.0005854 [lb_f/ft]
ST=70
T=70 [F]
}

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