This information is part of the Modelica Standard Library maintained by the Modelica Association.

This function calculates the surface tension of R134a from the saturation record (e.g., use setSat_T function for input). The property is modelled by an approach of Okada and Higashi (1994).

Restrictions

This property is only defined in two-phase region.

References

Okada and Higashi:

Surface tension correlation of HFC-134a and HCFC-123. Proceedings of the Joint Meeting of IIR Commissions B1, B2, E1, and E2, Padua, Italy, pp. 541-548, 1994.

sigma = surfaceTension(sat)

sat	Type: SaturationProperties Description: Saturation property record

sigma	Type: SurfaceTension (N/m) Description: Surface tension sigma in the two phase region