Gas/Water Interfacial Tension

Gas/Water Interfacial Tension

Gas/Water Interfacial Tension correlation was published by Baker and Swerdloff in 1956.

File:Gas/Water Interfacial Tension.png

Gas/Water Interfacial Tension correlation in the PVT software at pengtools.com

Math and Physics

$\sigma_{68} =39 - 0.2571 SG_{oAPI}$

$\sigma_{100} =37.5 - 0.2571 SG_{oAPI}$

$At\ T<68F,\ \sigma_{od}=\sigma_{68}$

$At\ 68F<T<100F,\ \sigma_{od}=\frac{\sigma_{68} + (T - 68) * (\sigma_{100} - \sigma_{68})}{ (100 - 68)}$

$At\ T>100F,\ \sigma_{od}=\sigma_{100}$

$\sigma_{o}=\sigma_{od} \times (1-0.24P^{0.45})$

The interfacial tension becomes zero at miscibility pressure. 1 dyne/cm is used for calculations, then it becomes less than 1.

$if (\sigma_{o}<1) \sigma_{o}=1$

Nomenclature

$P$ = pressure, psia

$\sigma_{o}$ = gas/oil interfacial tension, dynes/cm

$\sigma_{od}$ = gas/oil interfacial tension for dead oil, dynes/cm

$T$ = temperature, °F

References

Baker, O. and Swerdloff, W. 1955. Calculation of Surface Tension 3—Calculating parachor Values. Oil Gas J. (5 December 1955): 141. Baker, O. and Swerdloff, W. 1956. Calculation of Surface Tension 6—Finding Surface Tension of Hydrocarbon Liquids. Oil Gas J. (2 January 1956): 125.