Wetting Fluid Selection
For a
successful CFP measurement, the wetting fluid must fill all pores and remain in
those pores until expelled by the applied pressure.
A low surface tension and low
viscosity ensure complete wetting. A low vapor pressure ensures the fluid will
not evaporate, including when exposed to high flow rates for several minutes.
GALWIK
• The
most popular choice for general applications
• Low
surface tension ensures complete wetting
• Low
vapor pressure, so observed pore opening is caused by test pressure, not
flow-driven evaporation
POREWIK
• Low
surface tension ensures complete wetting
• Higher
vapor pressure, so it evaporates more quickly than GalWik
• May
be helpful in cases where dry curves are compromised by re-wetting
The system includes default values for
the surface tension of each type of wetting fluid. To optimize pore diameter
accuracy, enter the individually measured value for the batch of fluid you are
using.
Other fluids can be created by the
operator with input of the correct Surface
Tension.